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Satoshi Watanabe Last modified date:2024.04.20

Professor / Fluids Engineering Research Group
Department of Mechanical Engineering
Faculty of Engineering


Graduate School
Undergraduate School


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Homepage
https://kyushu-u.elsevierpure.com/en/persons/satoshi-watanabe
 Reseacher Profiling Tool Kyushu University Pure
Phone
092-802-3108
Fax
092-802-0001
Academic Degree
Ph. D
Country of degree conferring institution (Overseas)
No
Field of Specialization
Fluid Engineering
Total Priod of education and research career in the foreign country
01years00months
Outline Activities
[Research activities]
Unsteady cavitating flow in turbomachinery
Internal flow structure of turbomachinery
Other subjects related to fluid mechanics and fluid machinery

[Education]
Exercise on fluid mechanics and fluid machinery

[Social activities]
Member of turbopump research group, Turbomachinery Society of Japan
Research
Research Interests
  • Research on the flow mechanism of cavitation instabilities in inducers toward their advance detection, control and suppression
    keyword : Inducer, Cavitation instabilities, Advance detection
    1998.04The attachment of pump inducer upstream of main impeller is a powerful method to improve the cavitation performance. However under the severe condition of suction pressere at partial flow rate, cavitation induced oscillation occurrs and stable pump operation becomes difficult. This oscillation is investigated in order to elucidate the mechanism of oscillation occurring and to develop the advance detection system and suppression devices..
  • Experimental/Numerical studies on basic charactersitics of unsteady cavitating flow around hydrofoils and cascades
    keyword : Cavitation, Unsteady Flow
    1998.04Experimental/Numerical studies on basic charactersitics of unsteady cavitating flow around hydrofoils and cascades.
  • Theoretical/numerical modeling of thermodynamic effect of cavitation (real fluid effects of thermosensible fluid) and its application to the unsteady cavitation analysis
    keyword : Cavitation, Thermodynamic effect
    2005.04Theoretical/numerical modeling of thermodynamic effect of cavitation (real fluid effects of thermosensible fluid) and its application to the unsteady cavitation analysis .
  • Reseach and development of simplified ducted Darriues hydroturbine for utilization of extra low head sites.
    keyword : Darriues hydroturbine, Extra low head hydropower, Low cost
    1998.04Reseach and development of simplified ducted Darriues hydroturbine for utilization of extra low head sites..
  • Research and develomement of gas-liquid two phase flow centrifugal pump and its application to large capacity micro-bubble generator
    keyword : Centrifugal pump, Gas liquid two-phase flow, Microbubble
    1998.04Research and develomement of gas-liquid two phase flow centrifugal pump and its application to large capacity micro-bubble generator.
  • Research on high performance design of contra-rotating axial flow pump
    keyword : Turbomachinery, Axial flow pump, Contra-rotating rotors, High performance
    1999.04There is a demand for a small-sized and high-speed axial flow pump with high efficiency for energy and CO2 prolems. An axial flow pump with contra-rotating rotors, instead of with rotor-stator, has been proposed to achieve the demand. In order to develop the design guiding principle, The experimental and computational works are carried on..
Academic Activities
Papers
1. De ZHANG, Yusuke KATAYAMA, Satoshi WATANABE, Shin-Ichi TSUDA, Akinori FURUKAWA, Performance prediction model of contra-rotating axial flow pump with separate rotational speed of front and rear rotors and its application for energy saving operation, Journal of Fluid Science and Technology, 10.1299/jfst.2020jfst0015, 2020.07.
2. Y. Suzuki, Y. Katayama, S. Watanabe, S. Tsuda, A. Furukawa, A study on performance prediction of Darrieus-type hydroturbine operated in open channels using CFD with actuator disk method, IOP Conference Series: Earth and Environmental Science, 10.1088/1755-1315/240/4/042020, 240, 4, 2019.03, A performance of Darrieus-type hydroturbine is strongly influenced by the channel and flow condition. These flow conditions are different from place to place and also dependent upon the seasons, therefore it is difficult to study these influences only by experiments. On the other hand, numerical simulation can be adopted for various flow conditions. However, calculation costs are very expensive since fully unsteady simulation taking account of free surface of water should be conducted for this turbine as a cross-flow type. Then, in this paper, a simple numerical model is developed. In this model, instead of solving the complex flow field around the turbine, it is modeled by an actuator disk which imposes the total pressure difference consumed by the rotating turbine. Our previous study suggested that the head coefficient defined as the total pressure difference across the runner normalized by the dynamic pressure with area averaged flow velocity into the turbine seemed to well represent the specific performance of Darrieus-type hydroturbine. In this paper, the specific performance is determined from the experiment in one channel, and the corresponding total pressure change is locally applied to the actuator disk as a function of local inflow velocity. The predicted overall head coefficient, which is defined as the total pressure difference between far upstream and downstream normalized by area averaged velocity downstream of the turbine, is compared with experiment. As a result, when the flow velocity or depth decreases, the overall head coefficient increases. The proposed model can qualitatively reflect this influence of flow velocity and depth on the turbine performance in most cases, while quantitatively the predicted overall head coefficient is different from that in the experiments, indicating the necessity of further modification of the model for quantitative prediction..
3. Keisuke Tsutsumi, Satoshi Watanabe, Shin ichi Tsuda, Takeshi Yamaguchi, Cavitation simulation of automotive torque converter using a homogeneous cavitation model, European Journal of Mechanics, B/Fluids, 10.1016/j.euromechflu.2016.09.001, 61, 263-270, 2017.01, To understand the flow mechanism of cavitation and its effect on the performance of automotive torque converter, numerical simulation considering cavitation is carried out at various turbine–pump speed ratios from 0 to 0.8. Since the cavitation in working fluid of torque converter is rather gaseous than vaporous, the partial pressure of air is applied to the cavity pressure in the simplified Rayleigh–Plesset cavitation model used in the present simulations. It is found that, for the lower speed ratios (0.6), the cavitation occurs at the pump inlet simultaneously or earlier than that at the stator. Once the cavitation occurs at the pump, the pump torque seems to drop suddenly..
4. Satoshi WATANABE, Akinori FURUKAWA, Yoshiki YOSHIDA, Theoretical Analysis of Thermodynamic Effect of Cavitation in Cryogenic Inducer Using Singularity Method, International Journal of Rotating Machinery, Vol. 2008, Article ID 125678, 2008.06.
5. Satoshi WATANABE and Christopher BRENNEN, Dynamics of Cavitating Propeller in a Water Tunnel, Transactions of ASME, Journal of Fluids Engineering, Vol. 125, No. 2, pp.283-292, 2003.03.
6. Satoshi WATANABE,Yoshinobu TSUJIMOTO, Akinori FURUKAWA, Theoretical Analysis of Transitional and Partial Cavity Instabilities, Transactions of ASME, Journal of Fluids Engineering, 10.1115/1.1378295, 123, 3, 692-697, Vol.123, No.3, pp.692-697, 2001.09.
Presentations
1. S. Watanabe, Cavitation Instabilities of Pumps: From Linear Analyses to Experimental Observations, 11th International Symposium on Cavitation (CAV2021), 2021.05, ポンプのキャビテーション不安定現象について,著者らが独自に開発・展開し,現象解明に貢献してきた線形解析および実験観察に関する取り組みを講演した..
2. Rotating Stall Behavior in Radial Vaneless Diffuser of Centrifugal Pump and Its Suppression.
3. Blade Rows Interaction of Contra-Rotating Axial Flow Pump Rotors in Pressure Field on Casing Wall.
4. Utilization of Two-Dimensional Ducted Durrieus Turbine for Extra-Low Head Hydropower.
5. Steady Analysis of Thermodynamic Effect of Partial Cavitation Using Singularity Method.
6. Influences of Impeller Diameter and Diffuser Blades on Air-Water Two-Phase Flow Performance of Centrifugal Pump.
7. Suppression of Cavitation Surge of Inducer by Inserting Axi-asymmetric Obstacle Plate.
Membership in Academic Society
  • The Japanese Society for Multiphase Flow
  • American Society of Mechanical Engineers
  • Turbomachinery Society of Japan
  • Japan Society of Mechanical Engineers
Awards
  • Japan Society of Mechanical Engineers Paper Award
Educational
Other Educational Activities
  • 2019.08.
  • 2018.02.
Social
Professional and Outreach Activities
JAXA Visiting Researcher (2005.4-).