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Optimal shape and position of a thick deflector plate in front of a hydraulic Savonius turbine

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  • Kerikous, Emeel
  • Thévenin, Dominique

Abstract

This paper describes an optimization procedure for the shape and position of a thick deflector plate in front of a hydraulic Savonius turbine to improve the output power of the system for a constant frontal area. Seven geometrical parameters are taken into account during the optimization process. The simulation code Star-CCM+ is used to investigate the flow field around numerous structures to obtain the optimal configuration. This code is driven by OPAL++ (in-house code optimization). During the optimization procedure, maximizing the average power coefficient (Cp) is the main objective function. The optimal configuration improves the Cp by almost 11% for a tip speed ratio λ=1.1 in comparison with the traditional Savonius turbine. The hydrodynamic features of the turbine with the optimal deflector plate are discussed in detail and compared with the standard turbine, explaining that the increase in the turbine performance was obtained by an improved pressure distribution and enhanced flow configuration around the turbine blades. The performance of the turbine with optimal deflector plate is finally compared with the standard design for the whole operation range by varying the tip speed ratio. This comparison reveals that the power coefficient Cp is increased by nearly 15% for λ=1.2. Finally, it has been checked that the turbine with the deflector plate is still self-starting. The obtained design should not only be very useful to considerably improve the power of the turbine at a constant frontal area but also effective to protect the returning blade from collisions with suspended objects thanks to the deflector plate.

Suggested Citation

  • Kerikous, Emeel & Thévenin, Dominique, 2019. "Optimal shape and position of a thick deflector plate in front of a hydraulic Savonius turbine," Energy, Elsevier, vol. 189(C).
    • Handle: RePEc:eee:energy:v:189:y:2019:i:c:s0360544219318523
    DOI: 10.1016/j.energy.2019.116157
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    References listed on IDEAS

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    Cited by:

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    3. Khani, Mohammad Sadegh & Shahsavani, Younes & Mehraein, Mojtaba & Kisi, Ozgur, 2023. "Performance evaluation of the savonius hydrokinetic turbine using soft computing techniques," Renewable Energy, Elsevier, vol. 215(C).
    4. Cleynen, Olivier & Engel, Sebastian & Hoerner, Stefan & Thévenin, Dominique, 2021. "Optimal design for the free-stream water wheel: A two-dimensional study," Energy, Elsevier, vol. 214(C).
    5. C M, Shashikumar & Madav, Vasudeva, 2021. "Numerical and experimental investigation of modified V-shaped turbine blades for hydrokinetic energy generation," Renewable Energy, Elsevier, vol. 177(C), pages 1170-1197.
    6. Kang, Can & Zhao, Hexiang & Zhang, Yongchao & Ding, Kejin, 2021. "Effects of upstream deflector on flow characteristics and startup performance of a drag-type hydrokinetic rotor," Renewable Energy, Elsevier, vol. 172(C), pages 290-303.
    7. Abdelaziz, Khaled R. & Nawar, Mohamed A.A. & Ramadan, Ahmed & Attai, Youssef A. & Mohamed, Mohamed H., 2022. "Performance improvement of a Savonius turbine by using auxiliary blades," Energy, Elsevier, vol. 244(PA).
    8. Wu, Kuo-Tsai & Lo, Kuo-Hao & Kao, Ruey-Chy & Hwang, Sheng-Jye, 2023. "Design and performance analysis of a passive rotatable deflector diversion tail for tidal current power generation hydrokinetic turbines," Energy, Elsevier, vol. 283(C).
    9. Hu, Wenyu & E, Jiaqiang & Tan, Yan & Zhang, Feng & Liao, Gaoliang, 2022. "Modified wind energy collection devices for harvesting convective wind energy from cars and trucks moving in the highway," Energy, Elsevier, vol. 247(C).
    10. Abhishekkumar Shingala & Olivier Cleynen & Aman Jain & Stefan Hoerner & Dominique Thévenin, 2022. "Genetic Optimisation of a Free-Stream Water Wheel Using 2D Computational Fluid Dynamics Simulations Points towards Design with Fully Immersed Blades," Energies, MDPI, vol. 15(10), pages 1-20, May.

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