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写真a

カイ レオ
甲斐 玲央
KAI REO
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総合理工学研究院 環境理工学部門 助教
総合理工学府 総合理工学専攻(併任)
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助教
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[研究活動] 燃焼分野を専門とし,燃焼現象の解明とモデル化,および数値シミュレーションを中心に研究を行っている. 現在,下記の研究テーマに取り組んでいる. ・ガス燃焼のラージ・エディ・シミュレーション(Large Eddy Simulation, LES) ・予混合燃焼flameletの高度化 ・拡散燃焼flameletモデルの高度化 ・NOx生成モデルの開発 ・水素火炎の逆火現象に関する研究 ・アンモニア高温空気燃焼に関する研究
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学位

  • 博士(工学)(京都大学,日本)

経歴

  • 2022.4~2023.3 京都大学 大学院工学研究科 特定研究員

研究テーマ・研究キーワード

  • 研究テーマ:アンモニア高温空気燃焼

    研究キーワード:アンモニア燃焼,高温空気燃焼

    研究期間: 2023年10月

  • 研究テーマ:水素予混合燃焼のフラッシュバック

    研究キーワード:フラッシュバック,逆火,水素燃焼

    研究期間: 2023年4月

  • 研究テーマ:噴霧燃焼モデリング

    研究キーワード:噴霧燃焼,数値解析,モデル化

    研究期間: 2023年4月

  • 研究テーマ:乱流燃焼モデリング

    研究キーワード:乱流燃焼、数値解析、モデル化

    研究期間: 2023年4月

  • 研究テーマ:燃焼時におけるNOx生成のモデリング

    研究キーワード:NOx生成,数値計算,モデル化

    研究期間: 2023年4月

  • 研究テーマ:水素燃焼モデリング

    研究キーワード:水素燃焼,数値解析,モデル化

    研究期間: 2023年4月

受賞

  • 日本機械学会 動力エネルギーシステム部門 優秀講演表彰

    2023年10月   一般社団法人日本機械学会  

論文

  • Analysis of the Evolution of the Surface Density Function During Premixed V-Shaped Flame–Wall Interaction in a Turbulent Channel Flow at Re<inf>τ</inf> = 395

    Kai R., Pillai A.L., Ahmed U., Chakraborty N., Kurose R.

    Combustion Science and Technology   197 ( 1 )   32 - 58   2025年   ISSN:00102202

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    出版者・発行元:Combustion Science and Technology  

    The flame–turbulence interaction and statistical behavior of the surface density function (SDF; i.e. magnitude of the reaction progress variable gradient) in the vicinity of the wall for a stoichiometric methane-air flame are investigated using a three-dimensional direct numerical simulation of a turbulent premixed V-flame interacting with an isothermal inert wall in a fully developed turbulent channel flow at a friction Reynolds number (Formula presented.). The results show that the mean SDF significantly decreases in the viscous sublayer in comparison to the corresponding values for the same reaction progress variable in the unstretched laminar flame. Moreover, the mean values of SDF for a given value of reaction progress variable decrease in the downstream direction with the progress of flame quenching in all zones of turbulent boundary layer. The effective normal strain rate (Formula presented.) ((Formula presented.)), which acts to reduce the SDF as it increases, is much higher in the viscous sublayer than in the other layers. In the viscous sublayer, the contribution of the gradient of displacement speed in the flame-normal direction ((Formula presented.)) to (Formula presented.) has been shown to dominate the fluid-dynamic normal strain rate ((Formula presented.)). This tendency is qualitatively similar to the previous findings for a V-flame interacting with an isothermal inert wall at (Formula presented.). However, the maximum mean value of (Formula presented.) at (Formula presented.) is approximately twice of that at (Formula presented.), which causes a sharper drop in the SDF in the viscous sublayer at higher (Formula presented.).

    DOI: 10.1080/00102202.2022.2150971

    Scopus

  • Atomistic insights into formaldehyde (HCHO) high-temperature treatment and syngas production via ReaxFF MD simulations

    Yang, Y; Kai, R; Watanabe, H

    ENERGY   313   2024年12月   ISSN:0360-5442 eISSN:1873-6785

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    出版者・発行元:Energy  

    Formaldehyde (HCHO), typically known as an industrial waste gas, can be recycled to generate syngas. Our study focuses on the high-temperature and high-pressure treatment of formaldehyde, including pyrolysis, oxidation, and supercritical H2O/CO2 (scH2O/scCO2) co-pyrolysis via reactive molecular dynamics. Results showed that in the pyrolysis, the primary final products are H2 and CO. The formation of CO occurs through the double dehydrogenation of HCHO, and H-abstraction reaction leads to the formation of H2. In the oxidation, scH2O and scCO2 co-pyrolysis systems, the corresponding global reactions vary. HCHO can be oxidized to HCOOH, ultimately producing CO2. Another pathway for CO2 generation involves the formation of the COOH radical from CO. Oxidative treatment is more powerful in handling formaldehyde pollutants, while the supercritical condition is more effective in producing syngas. The order of carbon emission is oxidation > scH2O > pyrolysis. In the scCO2 system, scCO2 participates in the reaction, increasing CO production. Moreover, reaction kinetics models are proposed and agree well with experimental results. Under high-temperature conditions, the reaction rate in the oxidation system is the highest. Based on the activation energy for formaldehyde consumption and the energy barriers of the sub-reactions, the pyrolysis process is the easiest, whereas the oxidation process is the most difficult.

    DOI: 10.1016/j.energy.2024.133725

    Web of Science

    Scopus

  • Primary human mesenchymal stem cell culture under xeno-free conditions using surface-modified cellulose nanofiber scaffolds

    Kai, R; Hatakeyama, M; Iwamoto, S; Kitaoka, T

    CARBOHYDRATE POLYMERS   343   122479   2024年11月   ISSN:0144-8617 eISSN:1879-1344

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  • FGM modeling considering preferential diffusion, flame stretch, and non-adiabatic effects for hydrogen-air premixed flame wall flashback

    Kinuta, K; Kai, R; Yada, K; Kurose, R

    COMBUSTION AND FLAME   269   2024年11月   ISSN:0010-2180 eISSN:1556-2921

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    出版者・発行元:Combustion and Flame  

    Preferential diffusion plays an important role especially in hydrogen flames. Flame stretch significantly affects the flame structure and induces preferential diffusion. A problematic phenomenon occurring in real combustion devices is flashback, which is influenced by non-adiabatic effects, such as wall heat loss. In this paper, an extended flamelet-generated manifold (FGM) method that explicitly considers the preferential diffusion, flame stretch, and non-adiabatic effects is proposed. In this method, the diffusion terms in the transport equations of scalars, viz. the progress variable, mixture fraction, and enthalpy, are formulated employing non-unity Lewis numbers that are variable in space and different for each chemical species. The applicability of the extended FGM method to hydrogen flames is investigated using two- and three-dimensional numerical simulations of hydrogen-air flame flashback in channel flows. The results of the extended FGM method are compared with those of detailed calculations and other FGM methods. The two-dimensional numerical simulations show that considering both preferential diffusion and flame stretch improves the prediction accuracy of the mixture fraction distribution and flashback speed. The three-dimensional numerical simulations show that the prediction accuracy of the flashback speed, backflow region, and distributions of physical quantities near the flame front is improved by employing the extended FGM method, compared with the FGM method that considers only the heat loss effect. In particular, the extended FGM method successfully reproduced the relationship between the reaction rate and curvature. These results demonstrate the effectiveness of the extended FGM method. Novelty and Significance Statement The novelty of this research is the development of a flamelet-generated mani-fold (FGM) method that explicitly considers preferential diffusion, flame stretch, and non-adiabatic effects. To the best of the authors’ knowledge, no studies have performed numerical simulations of pure hydrogen flames using such an FGM method. The developed FGM method was applied to numerical simula- tions of hydrogen-air premixed flame flashback at an equivalence ratio of 0.5 and reproduced the flashback speed of lean hydrogen-air premixed flame. The applicability of the FGM method to the numerical simulation of hydrogen-air flashback is reported first. This research is significant because the FGM method is one of the most widely used combustion models for premixed combustion, and the development of an accurate FGM method will contribute to the engineering field. The accurate prediction of the flame flashback attempted in this study is particularly important for the development of hydrogen-fueled combustion devices.

    DOI: 10.1016/j.combustflame.2024.113718

    Web of Science

    Scopus

  • Pressure-equilibrium semi-implicit solver for real fluids

    Wada, S; Kai, R; Pillai, AL; Yamada, T; Kurose, R

    PHYSICS OF FLUIDS   36 ( 11 )   2024年11月   ISSN:1070-6631 eISSN:1089-7666

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    出版者・発行元:Physics of Fluids  

    In this study, a semi-implicit pressure-based scheme which can suppress the spurious pressure oscillations is developed for real fluid flows. Conservation properties relevant to the proposed scheme are investigated through one-dimensional numerical simulations of the nitrogen interface advection. The efficiency and validity of this scheme are carefully examined with two- and three-dimensional numerical simulations of cryogenic nitrogen jets. From the one-dimensional simulation results, the conservation properties are well conserved as the past studies. The two-dimensional simulation results show that the developed scheme can reduce the computational cost by more than 92% (13-14 times faster) compared with the conventional density-based explicit solver employing the double flux model. It is also found that, through the three-dimensional simulation results, the developed scheme can predict the structure of the nitrogen jet under both transcritical and supercritical conditions, while taking into account the effects of real fluid properties on the mixing and spatiotemporal evolution of this jet, with excellent accuracy.

    DOI: 10.1063/5.0231255

    Web of Science

    Scopus

  • Reaction mechanism and light gas conversion in pyrolysis and oxidation of dimethyl ether (DME): A ReaxFF molecular dynamics study

    Yang, Y; Kai, R; Watanabe, H

    ENERGY   295   2024年5月   ISSN:0360-5442 eISSN:1873-6785

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    出版者・発行元:Energy  

    To uncover the microscopic reaction mechanisms of dimethyl ether (DME) pyrolysis and oxidation, reactive molecular dynamics simulations were employed to investigate the reaction processes under various O2/DME ratios and impurity environments at 2200 K–3200 K. The results show that DME pyrolysis begins with a decomposition reaction of CH3OCH3 → CH3O + CH3, ultimately leading to the formation of CO, H2 and PAHs. The reaction pathways of DME oxidation contain light gas conversion and combustion. In fuel rich conditions, the oxidation produces mainly H2 and CO, while in fuel lean conditions, the oxidation products tend to be H2O and CO2. The carbon components of DME are completely converted into CO2 and CO regardless of O2 content. In the presence of impurities H2O or CO2, the oxidation reaction pathway is altered, causing consumption and transformation of these impurities into active radicals such as OH, further promoting the progress of the reaction. The top three light gases produced are hydrogen, methanol and methane, and increasing H2 production in the DME oxidation process can be achieved through both oxygen subtraction and water addition. The rate of formaldehyde generation during pyrolysis is higher than that during oxidation. However, a higher oxygen content leads to increased formaldehyde production.

    DOI: 10.1016/j.energy.2024.131013

    Web of Science

    Scopus

  • Effects of considering preferential diffusion and flame stretch in FGM method for numerical simulations of hydrogen/air flames 招待 査読 国際誌

    Kazuhiro Kinuta, Reo Kai, Ryoichi Kurose

    Journal of Thermal Science and Technology   19 ( 1 )   2024年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1299/jtst.24-00087

  • Experimental and Numerical Investigation on Combustion Characteristics of Cracked Ammonia Flames

    An Z., Zhang W., Zhang M., Xing J., Kai R., Lin W., Wang R., Wang J., Huang Z., Kurose R.

    Energy and Fuels   38 ( 8 )   7412 - 7430   2024年4月   ISSN:08870624

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    出版者・発行元:Energy and Fuels  

    The combustion characteristics of cracked NH3 flames are investigated experimentally and numerically. The one-dimensional (1D) calculations are performed to validate the accuracy of the reaction mechanisms in cracking conditions and to understand the fundamental characteristics of the cracked NH3 flames. In the experiments, the local distributions of OH and NO and the species emissions of NO, NO2, N2O, and NH3 are measured using hydroxyl radical planar laser-induced fluorescence (OH-PLIF), NO* chemiluminescence, and Fourier transform infrared (FTIR) spectroscopy, respectively. The effects of partial cracking on the flame structure and emission characteristics are investigated. In addition, the large eddy simulations (LESs) with flamelet-generated manifold (FGM) methods, which consider the preferential diffusion effect, are conducted to understand the validity of the LES and to further elucidate the effects of the cracking ratio (Cr) on cracked NH3 flames. The 1D calculation results show that reaction mechanisms by Mei et al. ( Mei, B. ; Zhang, J. ; Shi, X. ; Xi, Z. ; Li, Y. Enhancement of ammonia combustion with partial fuel cracking strategy: Laminar flame propagation and kinetic modeling investigation of NH3/H2/N2/air mixtures up to 10 atm. Combust. Flame 2021, 231, 111472, 10.1016/j.combustflame.2021.111472), Shrestha et al. ( Shrestha, K. P. ; Lhuillier, C. ; Barbosa, A. A. ; Brequigny, P. ; Contino, F. ; Mounaïm-Rousselle, C. ; Seidel, L. ; Mauss, F. An experimental and modeling study of ammonia with enriched oxygen content and ammonia/hydrogen laminar flame speed at elevated pressure and temperature. Proc. Combust. Inst. 2021, 38, 2163−2174, 10.1016/j.proci.2020.06.197), and Otomo et al. ( Otomo, J. ; Koshi, M. ; Mitsumori, T. ; Iwasaki, H. ; Yamada, K. Chemical kinetic modeling of ammonia oxidation with improved reaction mechanism for ammonia/air and ammonia/hydrogen/air combustion. Int. J. Hydrogen Energy 2018, 43, 3004−3014, 10.1016/j.ijhydene.2017.12.066) have acceptable accuracies for predicting combustion characteristics of cracked NH3 flames. As the cracking ratio increases, the ignition delay time (tig) and laminar flame speed (Sl) are shortened and accelerated, respectively, and the effect of Cr on Sl becomes evident in higher ϕ conditions. The NO emissions exhibit a tendency to achieve peaks around Cr = 0.6-0.9, irrespective of ϕ. The experimental results show that the partial cracking significantly changes the NH3 swirl flame structure. As Cr increases, the flames changed from “V” to “M” shape and the OH and NO* signals are enhanced. While OH and NO* signals show a strong positive correlation in a pure NH3 flame, the correlation gradually weakens when Cr increases. As Cr increases, the NO and NO2 emissions increase, whereas the NH3 emissions decrease. As a result, the optimal condition for minimizing global emissions is considered to be Cr = 0.2. By comparison of the velocity and OH fields to the experiments, it is verified that the present LESs coupled with the FGM combustion model, considering the preferential diffusion effect, capture the general feature of the cracked NH3 swirl flames well. The heat release rate (HRR) is enhanced as a result of partial cracking. A higher Cr enables the flame to stabilize even in highly strained areas of the flame front. As Cr increases, the amount of both fuel NO and thermal NO increases as a result of higher O and OH and higher temperature. However, these are reduced by increasing ϕ and enhancing heat loss through walls.

    DOI: 10.1021/acs.energyfuels.4c00312

    Scopus

  • Experimental and numerical investigation on combustion characteristics of cracked ammonia flames 招待 査読 国際誌

    Zhenhua An, Weijie Zhang, Meng Zhang, Jingkuan Xing, Reo Kai, Wenjun Liu, Ruixiang Wang, Jinhua Wang, Zuohua Huang, Ryoichi Kurose

    Energy & Fuels   38 ( 8 )   7412 - 7430   2024年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1021/acs.energyfuels.4c00312

  • A study on precise estimation of laminar burning velocity of lean hydrogen-air premixed flame (Effect of species diffusion models) 招待 査読 国際誌

    Reo Kai, Hiroaki Watanabe, Ryoichi Kurose

    Mechanical Engineering Journal   11 ( 2 )   2024年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1299/mej.23-00400

  • A new semi-implicit pressure-based solver considering real gas effect

    Wada S., Kai R., Kurose R.

    Journal of Computational Physics   501   2024年3月   ISSN:00219991

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    出版者・発行元:Journal of Computational Physics  

    A new semi-implicit pressure-based solver considering the real gas effect is developed and tested. The advantage of the semi-implicit solver is that it can take a large time step, which makes the calculation speed faster than the classical density-based explicit solver. The comparison of the calculation speed between the explicit density-based solver and the new semi-implicit pressure-based solver is conducted by performing two-dimensional numerical simulations of a cryogenic nitrogen planar jet. Moreover, the developed pressure-based solver is validated by comparing the numerical results of a three-dimensional large-eddy simulation of a cryogenic nitrogen jet under the supercritical pressure condition with the experimental result. Results show that the developed pressure-based solver can calculate more than five times faster than the classical explicit density-based solver and accurately predict the jet behavior under the supercritical pressure condition.

    DOI: 10.1016/j.jcp.2024.112782

    Scopus

  • Prediction of boundary layer flashback limits of hydrogen flame using an LES/non-adiabatic FGM approach 招待 査読 国際誌

    Shinichi Fukuba, Takayuki Nishiie, Reo Kai, Ryoichi Kurose

    International Journal of Gas Turbine, Propulsion and Power Systems   2024年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  • Reaction mechanism and light gas conversion in pyrolysis and oxidation of dimethylether (DME): A ReaxFF molecular dynamics study 招待 査読 国際誌

    Yu Yang, Reo Kai, Hiroaki Watanabe

    Energy   295   2024年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.energy.2024.131013

  • Effects of preferential diffusion and flame stretch on FGM method for numerical simulations of ammonia/air premixed combustion

    Kai, R; Ayukawa, S; Kinuta, K; Kurose, R

    APPLICATIONS IN ENERGY AND COMBUSTION SCIENCE   17   2024年3月   ISSN:2666-352X

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    出版者・発行元:Applications in Energy and Combustion Science  

    Importance of the considerations of preferential diffusion and flame stretch effects in the flamelet-generated manifold (FGM) method on the prediction accuracy is investigated by two-dimensional numerical simulations of cylindrical NH3/air premixed flames, under the conditions of an unburnt gas temperature of 673 K, an ambient pressure of 2 MPa, and equivalence ratios of 0.8 to 1.2. Results of the numerical simulations using the detailed chemistry, in which 32 species and 204 reactions are directly solved in the physical space without the FGM method, show that the mixture fraction in the burnt gas increases from the unburnt gas value when considering the preferential diffusion effect, whereas it remains flat when assuming the unity Lewis number. This means that assuming the unity Lewis number causes the underprediction and overprediction of the burnt gas temperature under fuel-lean and fuel-rich conditions, respectively. Results of the numerical simulations using the FGM methods show that considering the preferential diffusion and flame stretch effects in the FGM method is important for accurate prediction of the flame propagating speed, and the effectiveness is more evident for the flame stretch effect than for the preferential diffusion effect for the NH3/air premixed flames.

    DOI: 10.1016/j.jaecs.2024.100253

    Web of Science

    Scopus

  • Effects of preferential diffusion and flame stretch on FGM method for numerical simulations of ammonia/air premixed combustion 招待 査読 国際誌

    Reo Kai, Shinya Ayukawa, Kazuhiro Kinuta, Ryoichi Kurose

    Applications in Energy and Combustion Science   17   2024年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.jaecs.2024.100253

  • A new semi-implicit pressure-based solver considering real gas effect 招待 査読 国際誌

    Sho Wada, Reo Kai, Ryoichi Kurose

    Journal of Computational Physics   501   2024年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.jcp.2024.112782

  • Prediction of boundary layer flashback limits of hydrogen flame using an LES/non-adiabatic FGM approach

    Fukuba S., Nishiie T., Kai R., Kurose R.

    International Journal of Gas Turbine, Propulsion and Power Systems   15 ( 1 )   40 - 47   2024年1月

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    出版者・発行元:International Journal of Gas Turbine, Propulsion and Power Systems  

    To design a low-emission hydrogen-fired gas turbine combustor, prevention of flashback is one of key issues. However, the detailed measurement of flashback is difficult and expensive, especially at the actual operation condition. Therefore, the high-precision numerical simulation technology is important to study the mechanism and countermeasures of flashback. In this study, a large eddy simulation (LES) using a non-adiabatic flamelet-generated manifold (NA-FGM) approach, considering the effects of heat loss, is applied to simulate hydrogen-air premixed flame propagating in a rectangular channel. Then, the validity of predicting flashback limits is examined. The results show that the NA-FGM approach quantitatively well captures the flashback limits variation observed in the experiments. This indicates that accounting for the influence of heat loss is crucial in achieving precise prediction of the flashback in developing a low-emission hydrogen gas turbine combustor.

    DOI: 10.38036/jgpp.15.1_40

    Scopus

  • Effects of considering preferential diffusion and flame stretch in FGM method for numerical simulations of hydrogen/air flames

    Kinuta K., Kai R., Kurose R.

    Journal of Thermal Science and Technology   19 ( 1 )   2024年

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    出版者・発行元:Journal of Thermal Science and Technology  

    One-dimensional numerical simulations of an unstretched propagating hydrogen/air premixed flame and two-dimensional numerical simulations of outwardly propagating hydrogen/air laminar premixed flames are performed using a flamelet-generated manifold (FGM) method. The effects of considering preferential diffusion and flame stretch in the FGM method are investigated in detail. The results of the one-dimensional numerical simulations show that the flame behavior can be qualitatively reproduced without considering both these two phenomena, but it can be predicted more precisely by considering preferential diffusion. On the other hand, the results of the two-dimensional numerical simulations show that considering both these two phenomena is essential to accurately predict the behavior of stretched hydrogen/air premixed flames at an equivalence ratio of less or more than 0.7. The results also show that the consideration of preferential diffusion and flame stretch is less important at an equivalence ratio of around 0.7. In addition, the validity of an assumption that the Lewis numbers of each species are constant, which is used in most previous studies, is investigated. The results show that assuming constant Lewis numbers worsens the prediction accuracy. The computational cost of the FGM method considering both preferential diffusion and flame stretch is about 1/15 that of the detailed calculation for the two-dimensional numerical simulations, which indicates the efficiency of the extended FGM method.

    DOI: 10.1299/jtst.24-00087

    Scopus

  • A study on precise estimation of laminar burning velocity of lean hydrogen-air premixed flame (Effect of species diffusion models)

    Kai, R; Watanabe, H; Kurose, R

    Mechanical Engineering Journal   11 ( 2 )   23-00400 - 23-00400   2024年   ISSN:2187-9745 eISSN:21879745

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    記述言語:英語   出版者・発行元:一般社団法人 日本機械学会  

    DOI: 10.1299/mej.23-00400

    Web of Science

    CiNii Research

  • A DNS study of detonation in H2 /O2 mixture with variable-intensity turbulences

    Suzuki, S; Iwata, K; Kai, R; Kurose, R

    PROCEEDINGS OF THE COMBUSTION INSTITUTE   40 ( 1-4 )   2024年   ISSN:1540-7489 eISSN:1873-2704

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    出版者・発行元:Proceedings of the Combustion Institute  

    Direct numerical simulation with a detailed chemical reaction mechanism is performed for detonation-turbulence interaction in a stoichiometric hydrogen/oxygen mixture. Three turbulences are introduced into detonation with different intensities which are defined by turbulent Reynolds number and turbulent Mach number. The results show that turbulent flow corrugates both shock and flame fronts and makes cellular structures obscure and randomized. The strongest turbulence distorts the shock so strongly that the transverse wave is unclear and cellular structure is destroyed. Time-averaged one-dimensional profiles demonstrate that turbulence promotes the reaction progress. Stronger turbulence produces more intermediate species, by which the chemical reaction reaches completion more rapidly. The turbulent combustion regime indicates that small eddies intrude the flame structure, for which unburned gas pockets are broken into pieces and consumed rapidly. It is consistent with the tendency of the probability density function of induction length, which has only one peak in a smaller value under stronger turbulences, whereas two peaks under the weakest turbulence and without turbulence. Turbulence increases the peak pressure on one-dimensionally averaged structure except for the case where the cellular structure is destroyed. Averaged detonation velocity is strongly correlated with the magnitude of peak pressure, which is the lowest in the strongest turbulence, whereas its deviation increases with turbulent intensities. The absence of the cellular structure, which has been confirmed in optical measurements of rotating detonation engines, could be attributed to the collapse of the cellular structure observed in the strongest turbulence.

    DOI: 10.1016/j.proci.2024.105337

    Web of Science

    Scopus

  • Large-eddy simulation of the non-adiabatic reforming process of hot coke oven gas using a flamelet-based approach 査読 国際誌

    Panlong Yu, Sujeet Yadav, Yong Hu, Reo Kai, Koyo Norinaga, Ryoichi Kurose, Hiroaki Watanabe

    Journal of Mechanical Science and Technology   18 ( 2 )   2023年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1299/jtst.23-00279

  • LES flamelet modeling of hydrogen combustion considering preferential diffusion effect

    Kai R., Tokuoka T., Nagao J., Pillai A.L., Kurose R.

    International Journal of Hydrogen Energy   48 ( 29 )   11086 - 11101   2023年4月   ISSN:03603199

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    出版者・発行元:International Journal of Hydrogen Energy  

    A flamelet-generated manifold (FGM) method that explicitly considers the preferential diffusion effect, referred to as FGM-PD method, is employed for large-eddy simulations (LESs) of a lean-premixed H2/air low-swirl lifted flame, and the validity is examined by comparing with the experiment. First, the applicability of the FGM-PD method is investigated by one-dimensional numerical simulations of planar laminar premixed H2/air flames. Next, LESs of a lean-premixed H2/air low-swirl lifted flame are performed employing the FGM-PD and conventional FGM methods. Results of the one-dimensional numerical simulations show the importance of considering preferential diffusion to accurately predict species concentrations near the flame front. The FGM-PD method accurately predicts this, and therefore, reproduces the laminar burning velocity and spatial distributions of temperature and mixture fraction. Three-dimensional LES results confirm that the prediction accuracy of the velocities near the flame front is improved by employing this FGM-PD method. Additionally, the OH mass fraction distribution predicted by the FGM-PD method exhibits the inhomogeneous finger-like structure, which has been observed in previous experiments. This inhomogeneity of OH mass fraction distribution, which corresponds to that of the reaction rate, predicted by the FGM-PD method, strongly affects the flame front structure.

    DOI: 10.1016/j.ijhydene.2022.12.164

    Scopus

  • Direct numerical simulation of detonation-turbulence interaction in hydrogen/oxygen/argon mixtures with a detailed chemistry

    Iwata K., Suzuki S., Kai R., Kurose R.

    Physics of Fluids   35 ( 4 )   2023年4月   ISSN:10706631

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    出版者・発行元:Physics of Fluids  

    Direct numerical simulation is conducted to address the detonation-turbulence interaction in a stoichiometric hydrogen/oxygen/argon mixture. The argon dilution rate is varied so that the mixture composition is 2H2 + O2 + 7Ar and 2H2 + O2 + Ar to discuss the effects of cell regularity on the sensitivity to turbulence. Turbulent Reynolds number and turbulent Mach number are taken to be common for both mixtures. The results show that the shock and flame of detonation in both mixtures are significantly deformed into corrugated ones in the turbulent flow, producing many small unburned gas pockets. However, one-dimensional time-averaged profiles reveal the different sensitivity of the mixtures: in the highly diluted mixture (2H2 + O2 + 7Ar), the reaction progress is not much influenced by turbulence, whereas in the less-diluted mixture (2H2 + O2 + Ar), the reaction takes place more rapidly with turbulence. Analysis of the properties of turbulence and turbulent fluctuations in the detonations clarifies that the direct contribution of turbulence to the flame front is weaker; there is no clear correlation between the heat release and the curvature of the flame. On the other hand, a broader Mach number distribution just upstream of the shock front creates more hot spots in the less-diluted mixture, which results in a shorter induction length. These results indicate that the main contribution of turbulence is creation of different shock strength, which could lead to different reaction rates depending on the cell regularity.

    DOI: 10.1063/5.0144624

    Scopus

  • Direct numerical simulation of detonation–turbulence interaction in hydrogen/oxygen/argon mixtures with a detailed chemistry 査読 国際誌

    35   2023年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1063/5.0144624

  • LES flamelet modeling of hydrogen combustion considering preferential diffusion effect 査読 国際誌

    Reo Kai, Taiki Tokuoka, Jun Nagao, Abhishek Lakshman Pillai, Ryoichi Kurose

    International Journal of Hydrogen Energy   48 ( 29 )   11086 - 11101   2023年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.ijhydene.2022.12.164

  • LES Study of stabilization mechanism in lifted ethanol spray flames

    Hu Y., Kai R., Wen J., Murakami T., Jiang Y., Kurose R.

    Proceedings of the Combustion Institute   39 ( 2 )   2609 - 2620   2023年1月   ISSN:15407489

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    出版者・発行元:Proceedings of the Combustion Institute  

    This work presents a detailed numerical investigation of dilute spray lifted flames experimentally studied by O'Loughlin and Masri at the University of Sydney (O'Loughlin and Masri, Combust. Flame 2011), with a focus on understanding the mechanism that governs flame stabilization under the influence of sprays. Two ethanol flames with varied spray mass loading and degree of partial-premixing at the inlet are simulated by large eddy simulation (LES) combined with the dynamically thickened flame (DTF) model with finite-rate chemistry. Chemical explosive mode analysis (CEMA) is employed which helps identify the prominent role of an entrainment-based ignition process along the shear layer; this process dominates the flame anchoring of the downstream partially-premixed reaction zone. Thus, a higher spray loading can intensify the entrainment, leading to a faster formation of ignition kernels. Furthermore, in present flames, the stabilization point appears to be sustained in a purely gaseous zone with the most reactive mixture fraction and low scalar dissipation rate. Results show that the premixed flamelet can adequately represent flame structures at the leading-edge that are primarily controlled by the inlet partial-premixing, whereas the upstream evolving pre-ignition mixtures are fit for the diffusion flamelet. Moreover, both flamelet configurations fail in capturing downstream structures with a direct spray - flame interaction because the larger droplets produce a less homogeneous mixture with a higher scalar dissipation rate. This is more evident in the lean spray flame.

    DOI: 10.1016/j.proci.2022.07.127

    Scopus

  • LES study on the breakup mechanism of LOX core in LOX/GH<inf>2</inf> supercritical combustion

    Wada S., Kai R., Kurose R.

    Proceedings of the Combustion Institute   39 ( 2 )   2737 - 2745   2023年1月   ISSN:15407489

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    出版者・発行元:Proceedings of the Combustion Institute  

    Large-eddy simulation (LES) employing a flamelet/progress-variable approach that considers the real gas effect is applied to liquid oxygen/ gaseous hydrogen (LOX/GH2) supercritical combustion, and the breakup mechanism of the LOX core is investigated in detail by comparing it to that in the inert case. The results show that in the reactive case, O2 is injected into the chamber in the liquid state; that is, LOX, successively shifts to the supercritical and gas states and then reacts with H2 in the gas state. The present LES in the reactive case generally succeeds in predicting the LOX core breakup location in the experiment. In the reactive case, the LOX core breakup location is observed to be further downstream than in the inert case. This is because in the inert case, the turbulent vortices that are produced around the injector exit act to break the LOX core, whereas in the reactive case, the turbulent vortices are suppressed by the volume dilatation and viscous forces around the LOX core. In the reactive case, the LOX core tends to be compressed and thinned by the thermal expansion caused by the combustion reaction around the LOX core, and at the same time, is stretched and broken by the shear forces caused by the thermal expansion.

    DOI: 10.1016/j.proci.2022.07.208

    Scopus

  • Large-eddy simulation of the non-adiabatic reforming process of hot coke oven gas using a flamelet-based approach

    Yu, PL; Yadav, S; Hu, Y; Kai, R; Norinaga, K; Kurose, R; Watanabe, H

    JOURNAL OF THERMAL SCIENCE AND TECHNOLOGY   18 ( 2 )   23-00279 - 23-00279   2023年   ISSN:1880-5566 eISSN:18805566

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    記述言語:英語   出版者・発行元:一般社団法人日本機械学会・社団法人日本伝熱学会  

    Large-eddy simulation (LES) coupling with a non-adiabatic flamelet progress variable (NA-FPV) approach with reconstructed flamelet chemistry states is employed to simulate the hot coke oven gas (HCOG) reforming process. In the NA-FPV model, the chemistry states are first computed based on the correction factor for enthalpy defects and then modified by substituting the species statistics in the maximum heat loss state with those of less heat release to compensate for the unphysical results. The numerical results of LES coupling this NA-FPV model have been compared with the experimental measurement data in terms of temperature and yields, and reasonable agreements have been achieved. According to the LES results, it is seen O2 only participates in the combustion process in the upper stream and the combustion process which mainly consumes H2 and CO is to provide the other reforming process with heat and steam. In the upper and middle streams, the main HCOG jet is wrapped by the swirling high-temperature combustion products, and the reforming process primarily takes place by consuming CH4, polycyclic aromatic hydrocarbons (PAHs), and steam, while considerable H2, CO, and CO2 are produced. It is observed that accompanying the reforming process C2H2 is generated and it peaks in the middle stream, thus it is considered soot is formed in the complex reactions.

    DOI: 10.1299/jtst.23-00279

    Web of Science

    Scopus

    CiNii Research

  • LES/flamelet/ANN of oxy-fuel combustion for a supercritical CO2 power cycle 査読 国際誌

    12   2022年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.jaecs.2022.100083

  • LES/flamelet/ANN of oxy-fuel combustion for a supercritical CO<inf>2</inf> power cycle

    Kasuya H., Iwai Y., Itoh M., Morisawa Y., Nishiie T., Kai R., Kurose R.

    Applications in Energy and Combustion Science   12   2022年12月

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    出版者・発行元:Applications in Energy and Combustion Science  

    Large eddy simulation (LES) employing a flamelet model coupled with an artificial neural network (ANN), namely the LES/flamelet/ANN is developed for supercritical oxy-fuel combustion and its validity is investigated in detail. An ANN is introduced to reduce the size of the flamelet library for non-adiabatic three gas-stream conditions of a real supercritical carbon dioxide (CO2) combustor. The fuel and oxidizer are methane (CH4) and a mixture of oxygen (O2) and CO2, respectively. To consider the real gas effect, the Soave-Redlich-Kwong (SRK) equation of state is solved to generate the flamelet library. The LES/flamelet/ANN is applied to two combustion fields in the combustor, namely the upstream and full fields of the combustor with low and high mesh sizes, respectively. The LES/flamelet/ANN for the upstream field is conducted to examine its applicability to the non-adiabatic three gas streams condition by varying the resolution of the flamelet library and by comparing it with the results obtained by the conventional LES/flamelet. The LES/flamelet/ANN for the full field is also conducted to validate the approach by comparing its results with those obtained from the experiment. The results show that the LES/flamelet/ANN of the upstream field properly reproduces the supercritical combustion behavior generated by the conventional LES/flamelet while maintaining the same level of computational cost. Furthermore, the LES/flamelet/ANN for the full field reasonably predicts the supercritical combustion behavior in the experiment, and the predicted combustor outlet temperature agrees well with the experimental results.

    DOI: 10.1016/j.jaecs.2022.100083

    Scopus

  • Analysis of the Evolution of the Surface Density Function During Premixed V-Shaped Flame–Wall Interaction in a Turbulent Channel Flow at Re\tau=395 査読 国際誌

    2022年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1080/00102202.2022.2150971

  • LES study on the breakup mechanism of LOX core in LOX/GH2 supercritical combustion 査読 国際誌

    2022年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: https://doi.org/10.1016/j.proci.2022.07.208

  • LES Study of stabilization mechanism in lifted ethanol spray flames 査読 国際誌

    Yong Hu, Reo Kai, Jian Wen, Taichi Murakami, Yong Jiang, Ryoichi Kurose

    Proceedings of the Combustion Institute   2022年9月

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: https://doi.org/10.1016/j.proci.2022.07.127

  • Numerical analysis of heat transfer characteristics of spray flames impinging on a wall under CI engine-like conditions 査読 国際誌

    Abhishek Lakshman Pillai, Reo Kai, Takuya Murata, Takato Ikedo, Ryo Masuda, Ryoichi Kurose

    Combustion and Flame   239   2022年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.combustflame.2021.111615

  • Numerical analysis of heat transfer characteristics of spray flames impinging on a wall under CI engine-like conditions

    Pillai A.L., Kai R., Murata T., Ikedo T., Masuda R., Kurose R.

    Combustion and Flame   239   2022年5月   ISSN:00102180

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    出版者・発行元:Combustion and Flame  

    Design of Compression Ignition (CI) engines with improved thermal efficiencies needs better understanding of the heat transfer mechanism from spray flame to the combustion chamber wall. In this regard, heat transfer occurring during the interaction between impinging spray flame and wall, under CI engine-like conditions, is investigated in this study using 3-Dimensional numerical simulations based on an Eulerian–Lagrangian framework. Simulations are performed for different fuel spray injection velocities (which are representative of different fuel injection pressures in CI engines), to examine their influence on the heat transfer between impinging spray flame and wall. To couple the convective and radiative heat transfer at the wall surface with the conduction heat transfer occurring within the finite thickness wall, Conjugate Heat Transfer (CHT) is incorporated in the simulations. A Non-Adiabatic Flamelet/Progress Variable (NA-FPV) approach is employed as the combustion model of n-dodecane, which is considered to be the fuel for liquid spray. Dynamics of the liquid film formed on the wall surface by impinging fuel droplets are captured using a particle-based approach. Contribution of radiative heat flux is taken into consideration using the Discrete Ordinates (DO) method. Results indicate that the total heat flux (sum of convective and radiative heat fluxes) at the wall surface increases with the fuel injection velocity. It is observed that the total wall heat flux is largest in the stagnation zone where the spray flame impinges directly on the wall surface, while the radiative heat flux at the wall surface becomes larger as the distance from this stagnation zone increases. Additionally, it is found that the influence of fuel injection velocity on the radiative heat flow rate at the wall surface is rather small. This radiative heat flow rate when expressed as a percentage of the total wall heat flow rate, ranges from ≈ 18% to 30% (depending on the 3 cases investigated), indicating that its contribution cannot be neglected for the CI engine-like conditions under which the present simulations are performed. Furthermore, to characterize the heat transfer occurring during spray flame-wall interaction process, correlations between the Nusselt number Nu (corresponding to the wall heat loss) and Reynolds number Re (of the flow field) of the form Nu∝Ren, are analysed and compared with that of a previous experimental study to assess their applicability. It is found that, depending on how the Nusselt number Nu is defined (either using the total wall heat flux or the convective heat flux), the value of the correlation index n changes. When Nu is calculated based on the total wall heat flux (which includes the contribution from the radiative heat flux), the value of n is found to be 0.49 which is close to the correlation index value of n=0.4 reported in the recent experiments performed at Toyota Central R&D Labs., Inc.

    DOI: 10.1016/j.combustflame.2021.111615

    Scopus

  • Numerical simulation of CO formation and reduction on flame propagation due to heat loss through the cooled wall 査読 国際誌

    Keita Yunoki, Reo Kai, Shinpei Inoue, Ryoichi Kurose

    Energy   236   2021年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.energy.2021.121352

  • Experimental and numerical study of water sprayed turbulent combustion: Proposal of a neural network modeling for five-dimensional flamelet approach 査読 国際誌

    Takafumi Honzawa, Reo Kai, Kotaro Hori, Makoto Seino, Takayuki Nishiie, Ryoichi Kurose

    Energy and AI   5   2021年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.egyai.2021.100076

  • Unsteady flamelet modeling for N2H4/N2O4 flame accompanied by hypergolic ignition and thermal decomposition 査読 国際誌

    Kento Konishi, Reo Kai, Ryoichi Kurose

    Applications in Energy and Combustion Science   5   2021年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.jaecs.2020.100022

  • Numerical Simulation of CO Concentration on Flame Propagation in the Vicinity of the Wall -Validity of Non-Adiabatic FGM Approach- 査読 国際誌

    Keita Yunoki, Reo Kai, Shinpei Inoue, Ryoichi Kurose

    International Journal of Gas Turbine, Propulsion and Power Systems   11 ( 3 )   8 - 15   2020年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.38036/jgpp.11.3_8

  • Numerical investigations of C1-C3 alkanes and H2 premixed flame-wall interaction: Effectiveness of insulation wall on heat loss reduction 査読 国際誌

    15 ( 3 )   2020年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1299/jtst.2020jtst0033

  • Conjugate heat transfer analysis of methane/air premixed flame – Wall interaction: A study on effect of wall material 査読 国際誌

    181 ( 25 )   2020年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.applthermaleng.2020.115947

  • Large eddy simulation of a partially pre-vaporized ethanol reacting spray using the multiphase DTF/flamelet model 査読 国際誌

    Yong Hu, Reo Kai, Ryoichi Kurose, Eva Gutheil, Hernan Olguin

    International Journal of Multiphase Flow   125   2020年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.ijmultiphaseflow.2020.103216

  • Numerical and experimental investigations on turbulent combustion fields generated by large-scale submerged combustion vaporizer burners with water spray equipment 査読 国際誌

    Takafumi Honzawa, Reo Kai, Makoto Seino, Takayuki Nishiie, Yoshiharu Suzuki, Akiko Okada, Kenichi Wazaki, Ryoichi Kurose

    Journal of Natural Gas Science and Engineering   76   2020年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.jngse.2020.103158

  • Predictions of NO and CO emissions in ammonia/methane/air combustion by LES using a non-adiabatic flamelet generated manifold 査読 国際誌

    Takafumi Honzawa, Reo Kai, Akiko Okada, Agustin Valera-Medina, Philip J. Bowen, Ryoichi Kurose

    Energy   186   2019年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: https://doi.org/10.1016/j.energy.2019.07.101

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書籍等出版物

講演・口頭発表等

  • DNS study of turbulent boundary layer flashback in parallel channel for lean hydrogen-air premixed flame 国際会議

    Reo Kai, Kotaro Yada, Kazuhiro Kinuta, Hiroaki Watanabe, Ryoichi Kurose

    19th International Conference on Numerical Combustion  2024年5月 

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    開催年月日: 2024年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • Detailed Diffusion Effects on Thermal and Chemical Kinetics in a Turbulent NH3/H2 Non-premixed Flame 国際会議

    Ahmed Abdelnasser Tawfik Adam, Reo Kai, Hiroaki Watanabe

    19th International Conference on Numerical Combustion  2024年5月 

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    開催年月日: 2024年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • An efficient numerical algorithm for solving multi-component real fluid flows in rocket engines 国際会議

    Sho Wada, Reo Kai, Abhishek Lakshman Pillai, Ryoichi Kurose

    19th International Conference on Numerical Combustion  2024年5月 

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    開催年月日: 2024年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • Massless-tracer analysis of detonation-turbulence interaction in non-diluted stoichiometric hydrogen/oxygen mixture: a DNS study 国際会議

    Sou Suzuki, Kazuya Iwata, Reo Kai, Ryoichi Kurose

    19th International Conference on Numerical Combustion  2024年5月 

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    開催年月日: 2024年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • Prediction of boundary layer flashback limits of hydrogen flame using an LES/non-adiabatic FGM approach 国際会議

    Shinichi Fukuba, Takayuki Nishiie, Reo Kai, Ryoichi Kurose

    International Gas Turbine Congress 2023  2023年11月 

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    開催年月日: 2023年11月 - 2023年12月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • Investigating the differential diffusion effect in flamelet model for the H2/NH3-fueled non-premixed flame 国際会議

    Ahmed Adam, Panlong Yu, Reo Kai, Hiroaki Watanabe

    International Gas Turbine Congress 2023  2023年11月 

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    開催年月日: 2023年11月 - 2023年12月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • LES/flamelet/ANN of oxy-fuel combustion for a supercritical CO2 power cycle under 8.5-28.5MPa conditions 国際会議

    Hiroki Kasuya, Yasunori Iwai, Masao Itoh, Yuichi Morisawa, Takayuki Nishiie, Reo Kai, Sho Wada, Ryoichi Kurose

    International Gas Turbine Congress 2023  2023年11月 

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    開催年月日: 2023年11月 - 2023年12月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • Numerical simulation of boundary layer flashback of hydrogen-air premixed flame using an extended FGM method 国際会議

    Kazuhiro Kinuta, Kotaro Yada, Reo Kai, Shinichi Fukuba, Ryoichi Kurose

    76th Annual Meeting of the APS Division of Fluid Dynamics  2023年11月 

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    開催年月日: 2023年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:アメリカ合衆国  

  • Applicability of a semi-implicit pressure-based algorithm without spurious pressure oscillations to real fluid flows 国際会議

    Sho Wada, Reo Kai, Abhishek Lakshman Pillai, Ryoichi Kurose

    76th Annual Meeting of the APS Division of Fluid Dynamics  2023年11月 

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    開催年月日: 2023年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:アメリカ合衆国  

  • 正デカン低温酸化反応に対するflamelet法の適用性検討

    甲斐 玲央,渡邊 裕章

    第61回 燃焼シンポジウム  2023年11月 

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    開催年月日: 2023年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:秋田アトリオン(秋田市)   国名:日本国  

  • 層流境界層における水素-空気予混合火炎フラッシュバックの数値解析 - 流路形状が及ぼす影響 -

    矢田 晃太郎,甲斐 玲央,黒瀬 良一

    第61回 燃焼シンポジウム  2023年11月 

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    開催年月日: 2023年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  • 直接数値計算による乱れ強さが水素予混合燃焼に与える影響の検討

    大野 達矢,鳥居 泰賀,廣瀬 智陽子,甲斐 玲央,渡邊 裕章

    第61回 燃焼シンポジウム  2023年11月 

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    開催年月日: 2023年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:秋田アトリオン(秋田市)   国名:日本国  

  • NO生成を高精度に予測可能な FGM 法の提案 -水素およびアンモニア予混合火炎を対象とした数値解析-

    甲斐 玲央,杉村 直紀,衣田 和弘,黒瀬 良一

    日本機械学会熱工学コンファレンス 2023  2023年10月 

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    開催年月日: 2023年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:神戸大学大学院工学研究科(神戸市)   国名:日本国  

  • 水素-空気燃焼の数値シミュレーション: 選択拡散・火炎伸長・非断熱効果を考慮可能なFGM法の開発

    衣田 和弘,甲斐 玲央,黒瀬 良一

    第51回 日本ガスタービン学会定期講演会  2023年10月 

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    開催年月日: 2023年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:福井県国際交流会館(福井市)   国名:日本国  

  • Influence of the scalar variances in a quasi-two-dimensional flamelet model to the LES of MILD combustion

    2023年10月 

     詳細を見る

    開催年月日: 2023年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  • 異なる強度を有する一様等方性乱流場を伝播するデトネーションの直接数値計算

    鈴木 颯,岩田 和也,甲斐 玲央,黒瀬 良一

    日本流体力学会年会2023  2023年9月 

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    開催年月日: 2023年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京農工大学小金井キャンパス(小金井市)   国名:日本国  

  • 実在流体効果を考慮した圧力ベース半陰解法:非物理的な圧力振動の抑制

    和田 祥, 甲斐 玲央, 黒瀬 良一

    日本流体力学会年会2023  2023年9月 

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    開催年月日: 2023年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:東京農工大学小金井キャンパス(小金井市)   国名:日本国  

  • Effects of homogeneous isotropic turbulence on detonation of a non-diluted hydrogen-oxygen mixture 国際会議

    Kazuya Iwata, Sou Suzuki, Reo Kai, Ryoichi Kurose

    10th International Symposium on Turbulence, Heat, Mass Transfer  2023年9月 

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    開催年月日: 2023年9月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:イタリア共和国  

  • Application of FGM Method Considering Preferential Diffusion and Flame Stretch to a Cylindrical Propagating Hydrogen Flame 国際会議

    Kazuhiro Kinuta, Reo Kai, Ryoichi Kurose

    29th International Colloquium on the Dynamics of Explosions and Reactive Systems (ICDERS)  2023年7月 

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    開催年月日: 2023年7月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:大韓民国  

  • Development of non-spurious pressure oscillation pressure-based semi-implicit scheme for real gas flows 国際会議

    Sho Wada, Reo Kai, Ryoichi Kurose

    ASME-JSME-KSME Fluid Engineering Division 2023  2023年7月 

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    開催年月日: 2023年7月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • A study on precise estimation of laminar burning velocity of hydrogen premixed flame: Effect of species diffusion models 国際会議

    Reo Kai, Ryoichi Kurose

    International Conference on Power Engineering 2023  2023年5月 

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    開催年月日: 2023年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • A study on FGM method considering preferential diffusion for numerical simulation of hydrogen/air premixed flame 国際会議

    Reo Kai, Kazuhiro Kinuta, Ryoichi Kurose

    The 11th Asian Joint Conference on Propulsion and Power (AJCPP2023)  2023年3月 

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    開催年月日: 2023年3月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • A semi-implicit pressure-based solver that considers real gas effect 国際会議

    Sho Wada, Reo Kai, Ryoichi Kurose

    The 11th Asian Joint Conference on Propulsion and Power (AJCPP2023)  2023年3月 

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    開催年月日: 2023年3月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • 水素/酸素/アルゴン混合気のセル規則性に依存するデトネーション-乱流相互作用に関する直接数値解析

    岩田和也,鈴木颯,甲斐玲央,黒瀬良一

    2022年度衝撃波シンポジウム  2023年3月 

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    開催年月日: 2023年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:産業技術総合研究所つくば中央共用講堂(茨城県)   国名:日本国  

  • 実在気体効果を考慮した数値解析のための圧力ベース半陰的ソルバーの開発

    和田祥,甲斐玲央,黒瀬良一

    第36回数値流体力学シンポジウム  2022年12月 

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    開催年月日: 2022年12月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 一様等方性乱流における水素/酸素/アルゴン混合気のデトネーションの直接数値計算 -混合気のセル規則性の影響に関する解析-

    岩田和也,甲斐玲央,黒瀬良一

    第60回燃焼シンポジウム  2022年11月 

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    開催年月日: 2022年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:KFC Hall & Rooms(東京都)   国名:日本国  

  • 選択拡散と火炎伸長を考慮したFGM法の提案とその希薄水素球状伝播火炎への適用

    衣田和弘,甲斐玲央,黒瀬良一

    第60回燃焼シンポジウム  2022年11月 

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    開催年月日: 2022年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:KFC Hall & Rooms(東京都)   国名:日本国  

  • Strained flamelet法を用いたアンモニア予混合火炎の数値解析

    甲斐玲央,鮎川真也,柚木啓太,黒瀬良一

    日本機械学会 第100期 流体工学部門 講演会  2022年11月 

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    開催年月日: 2022年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:熊本大学 工学部2号館(熊本県)   国名:日本国  

  • アンモニア予混合火炎のNOx生成に関する数値シミュレーション -Flamelet法の適用性検討-

    鮎川真也,甲斐玲央,柚木啓太,黒瀬良一

    第50回日本ガスタービン学会定期講演会  2022年10月 

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    開催年月日: 2022年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:九州大学医学部 百年講堂(福岡県)   国名:日本国  

  • Applicability of strained premixed flamelet approach to numerical simulation of ammonia flame 国際会議

    Reo Kai, Shinya Ayukawa, Keita Yunoki, Ryoichi Kurose

    1st Symposium on Ammonia Energy  2022年9月 

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    開催年月日: 2022年9月

    記述言語:英語   会議種別:口頭発表(一般)  

  • 選択拡散効果を考慮したflamelet法の水素予混合燃焼解析への適用

    甲斐玲央, 徳岡泰輝, 黒瀬良一

    第61回航空原動機・宇宙推進講演会  2022年3月 

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    開催年月日: 2022年3月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:米子コンベンションセンター(鳥取県)   国名:日本国  

  • 超臨界燃焼場におけるLOX coreの挙動の数値解析

    和田祥, 甲斐玲央, 黒瀬良一

    第35回数値流体力学シンポジウム  2021年12月 

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    開催年月日: 2021年12月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • チャネル乱流内における予混合火炎-壁相互作用のDNS

    甲斐玲央, PILLAI Abhishek, AHMED Umair, CHAKRABORTY Nilamjan, 黒瀬良一

    第59回燃焼シンポジウム  2021年11月 

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    開催年月日: 2021年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • アンモニア燃焼の着火遅れ時間,層流燃焼速度およびMarkstein長さに関する評価

    鮎川真也,甲斐玲央,黒瀬良一

    第49回日本ガスタービン学会定期講演会  2021年10月 

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    開催年月日: 2021年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Radiation Heat Transfer from Soot Formed in Wall-Impinging Spray Flames under CI Engine-Like Conditions: A Numerical Analysis 国際会議

    Abhisek Lakshman Pillai, Reo Kai, Ryoichi Kurose

    8th Asian Particle Technology Symposium APT2021  2021年10月 

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    開催年月日: 2021年10月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • 水素-酸素超臨界燃焼場における発熱と渦の関連性に関する数値解析

    徳岡泰輝, 甲斐玲央, 川村隆平, 黒瀬良一

    日本流体力学会年会2021  2021年9月 

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    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • Assessment of LES for Investigating Spray Flame Impinging on a Wall under Compression-Ignition Engine-like Environment 国際会議

    Abhisek Lakshman Pillai, Reo Kai, Jin Li, Ryoichi Kurose

    International Conference on Liquid Atomization and Spray Systems (ICLASS), Edinburgh  2021年9月 

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    開催年月日: 2021年8月 - 2021年9月

    記述言語:英語   会議種別:口頭発表(一般)  

  • 予混合火炎-壁相互作用の共役熱伝達解析 –遮熱材壁による熱損失低減効果-

    甲斐玲央,高橋梓,黒瀬良一

    第58回燃焼シンポジウム  2020年12月 

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    開催年月日: 2020年12月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 壁面衝突噴霧火炎のLES-着火遅れ,浮き上がり高さ,および壁面熱流束の予測-

    Abhisek Lakshman Pillai, 甲斐玲央,李径,黒瀬良一

    日本機械学会熱工学コンファレンス2020  2020年10月 

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    開催年月日: 2020年10月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • 低GWP冷媒の燃焼特性に関する数値解析

    西尾淳,三好明,甲斐玲央,奥岳人,池田宗史,黒瀬良一

    2020年度日本冷凍空調学会年次大会  2020年9月 

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    開催年月日: 2020年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:オンライン   国名:日本国  

  • LES of soot formation in a turbulent spray flame impinging on a wall using a hybrid method of moments model and non-adiabatic FPV approach

    Jin Li, Reo Kai, Abhisek Lakshman Pillai, Yong Hu, Ryoichi Kurose

    2019年11月 

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    開催年月日: 2019年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • Validation of non-adiabatic FGM approach for numerical simulation of flame propagation near the wall 国際会議

    Reo Kai, Kenichiro Takenaka, Ryoichi Kurose

    International Gas Turbine Congress 2019 (IGTC2019)  2019年11月 

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    開催年月日: 2019年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • Numerical simulation of CO concentration on flame propagation in the vicinity of the wall 国際会議

    Keita Yunoki, Reo Kai, Shinpeo Inoue, Kento Konishi, Ryoichi Kurose

    International Gas Turbine Congress 2019 (IGTC2019)  2019年11月 

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    開催年月日: 2019年11月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • ヒドラジン/NTO 燃焼の数値シミュレーションに対するFlamelet 法の検討

    小西健斗, 甲斐玲央, 黒瀬良一

    日本流体力学会 年会2019  2019年9月 

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    開催年月日: 2019年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:電気通信大学(東京都)   国名:日本国  

  • Validity of LES/flamelet approach for transcritical O2/H2 combustion 国際会議

    Reo Kai, Akihiro Kishimoto, Kenichiro Takenaka, Ryoichi Kurose

    12th Asia-Pacific Conference on Combustion (ASPACC2019)  2019年7月 

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    開催年月日: 2019年7月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • LES/non-adiabatic flamelet approach for water sprayed turbulent flame - Validity for NO and CO emissions prediction- 国際会議

    Takafumi Honzawa, Reo Kai, Makoto Seino,Takayuki Nishiie, Ryoichi Kurose

    12th Asia-Pacific Conference on Combustion (ASPACC2019)  2019年7月 

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    開催年月日: 2019年7月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • Numerical investigation of methane/air premixed flame near the wall with conjugate heat transfer: Effect of temperature swing heat insulation 国際会議

    Reo Kai, Ryo Masuda, Takato Ikedo, Ryoichi Kurose

    17th International Conference on Numerical Combustion  2019年5月 

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    開催年月日: 2019年5月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:ドイツ連邦共和国  

  • LES of turbulent combustion with water spray 国際会議

    Takafumi Honzawa, Reo Kai, Makoto Seino, Takayuki Nishiie, Kotaro Hori, Ryoichi Kurose

    The 1st R-CCS International Symposium  2019年2月 

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    開催年月日: 2019年2月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  • Large-eddy simulations of turbulent combustion fields generated by a Submerged Combustion Vaporizer (SCV) burner - Effect of water spray injection on combustion behavior - 国際会議

    Takafumi Honzawa, Reo Kai, Makoto Seino, Takayuki Nishiie, Kenichi Wazaki, Yoshiharu Suzuki, Ryoichi Kurose

    2018年11月 

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    開催年月日: 2018年11月

    記述言語:英語   会議種別:口頭発表(一般)  

  • 非断熱FGM法を用いた壁面近傍における火炎伝播の数値計算

    甲斐玲央, 竹中健一朗, 黒瀬良一,

    第56回燃焼シンポジウム,  2018年11月 

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    開催年月日: 2018年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:堺市産業振興センター(大阪府)   国名:日本国  

  • 非定常flamelet法を用いたヒドラジン/NTO燃焼の数値シミュレーション

    小西健斗, 甲斐玲央, 谷 洋海, 大門 優, 黒瀬良一

    第56回燃焼シンポジウム,  2018年11月 

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    開催年月日: 2018年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:堺市産業振興センター(大阪府)   国名:日本国  

  • DNS and LES of soot formation in oxy-fuel spray flame: Application of a non-adiabatic flamelet/progress-variable approach 国際会議

    Reo Kai, Akihiro Kishimoto, Kenichiro Takenaka, Masaya Muto, Ryoichi Kurose

    The 16th International Heat Transfer Conference (IHTC-16)  2018年8月 

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    開催年月日: 2018年8月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:中華人民共和国  

  • Large-eddy simulation employing flamelet approach of a transcritical O2/H2 jet flame 国際会議

    Reo Kai, Kenichiro Takenaka, Akihiro Kishimoto, Ryoichi Kurose

    ECCOMAS ECCM-ECFD 2018 (the European Community on Computational Methods in Applied Sciences (ECCOMAS), the 6th European Conference on Computational Mechanics (Solids, Structures and Coupled Problems) (ECCM 6) and the 7th European Conference on Computational Fluid Dynamics (ECFD 7))  2018年6月 

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    開催年月日: 2018年6月

    記述言語:英語   会議種別:口頭発表(一般)  

  • 熱損失を考慮可能なflamelet法を用いた噴霧燃焼中すす生成の数値シミュレーション

    甲斐玲央, 岸本章裕, 竹中健一朗, 武藤昌也, 黒瀬良一

    第31回数値流体シンポジウム  2017年12月 

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    開催年月日: 2017年12月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:京都工芸繊維大学(京都府)   国名:日本国  

  • Validity of a LES/flamelet approach to a transcritical O2/H2 jet flame 国際会議

    Reo Kai, Kenichiro Takenaka, Akihiro Kishimoto, Ryoichi Kurose

    2017年11月 

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    開催年月日: 2017年11月

    記述言語:英語   会議種別:口頭発表(一般)  

  • 壁面近傍におけるCH4/H2/Air予混合火炎のDNS

    竹中健一朗, 甲斐玲央, 武藤昌也, 黒瀬良一

    第55回燃焼シンポジウム  2017年11月 

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    開催年月日: 2017年11月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:富山国際会議場(富山県)   国名:日本国  

  • Numerical simulation with flamelet approach for transcritical combustion 国際会議

    Kenichiro Takenaka, Akihiro Kishimoto, Reo Kai, Ryoichi Kurose

    Ninth JSME-KSME Thermal and Fluids Engineering Conference (TFEC9)  2017年10月 

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    開催年月日: 2017年10月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

▼全件表示

所属学協会

  • 日本機械学会

  • 日本燃焼学会

  • 日本ガスタービン学会

委員歴

  • 日本ガスタービン学会   学会誌編集委員会委員   国内

    2024年4月 - 現在   

学術貢献活動

  • 実行委員会

    第35回内燃機関シンポジウム  2024年12月

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    種別:大会・シンポジウム等 

  • Secretary General 国際学術貢献

    International Conference on Numerical Combustion 2024  ( KYOTO TERRSA (Kyoto city) Japan ) 2024年5月

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    種別:大会・シンポジウム等 

  • Chair 国際学術貢献

    International Gas Turbine Congress 2023  ( Kyoto International Conference Center (Kyoto) Japan ) 2023年11月 - 2023年12月

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    種別:大会・シンポジウム等 

  • 座長

    第61回 燃焼シンポジウム  ( 秋田アトリオン(秋田市) ) 2023年11月

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    種別:大会・シンポジウム等 

共同研究・競争的資金等の研究課題

教育活動概要

  • ・機械電気科学実験III(工学部融合基礎工学科3年秋学期)
    ・週一回の研究室ゼミを実施し,卒業論文研究,修士論文研究,および博士論文研究の研究指導を実施

担当授業科目

  • 機械電気科学実験III

    2023年10月 - 2023年12月   秋学期