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An analysis of the transient forces acting on Savonius rotors with different aspect ratios

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  • Jaohindy, Placide
  • McTavish, Sean
  • Garde, François
  • Bastide, Alain

Abstract

The present study deals with the analysis of the transient forces of a Savonius vertical axis wind turbine (VAWT) using computational fluid dynamics (CFD). Unsteady, Reynolds Averaged Navier–Stokes CFD simulations were conducted using two different rotors and two simulation methodologies. The first rotor had an aspect ratio of 1.1 and simulations were conducted by incorporating the dynamic equations of the rigid-rotor motion using a one degree-of-freedom (1-DOF) module to evaluate the rotor's free motion. The second rotor had an aspect ratio of 0.7 and simulations were conducted by specifying a fixed rotational velocity. The predicted torque and power curves were validated using experimental data. The transient forces from the two rotor blades, the resultant forces, and the longitudinal drag and lateral lift coefficients were evaluated using the two complementary data sets. The lateral force coefficient had a large contribution to the rotor torque at low azimuth angles and at low tip speed ratios (λ). At tip speed ratios above 0.6, the effect of the longitudinal drag force on the rotor operation increased and the lateral lift force contribution decreased. The resultant force angle was shown to become more acute due to the increase in the longitudinal force with increasing λ.

Suggested Citation

  • Jaohindy, Placide & McTavish, Sean & Garde, François & Bastide, Alain, 2013. "An analysis of the transient forces acting on Savonius rotors with different aspect ratios," Renewable Energy, Elsevier, vol. 55(C), pages 286-295.
    • Handle: RePEc:eee:renene:v:55:y:2013:i:c:p:286-295
    DOI: 10.1016/j.renene.2012.12.045
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    References listed on IDEAS

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    Cited by:

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    4. Mereu, R. & Federici, D. & Ferrari, G. & Schito, P. & Inzoli, F., 2017. "Parametric numerical study of Savonius wind turbine interaction in a linear array," Renewable Energy, Elsevier, vol. 113(C), pages 1320-1332.
    5. Scheaua Fanel Dorel & Goanta Adrian Mihai & Dragan Nicusor, 2021. "Review of Specific Performance Parameters of Vertical Wind Turbine Rotors Based on the SAVONIUS Type," Energies, MDPI, vol. 14(7), pages 1-23, April.
    6. Ducoin, A. & Shadloo, M.S. & Roy, S., 2017. "Direct Numerical Simulation of flow instabilities over Savonius style wind turbine blades," Renewable Energy, Elsevier, vol. 105(C), pages 374-385.
    7. Zhang, Yongchao & Kang, Can & Ji, Yanguang & Li, Qing, 2019. "Experimental and numerical investigation of flow patterns and performance of a modified Savonius hydrokinetic rotor," Renewable Energy, Elsevier, vol. 141(C), pages 1067-1079.
    8. Khairil Anwar & Syukri Himran & Luther Sule & Nasruddin Azis, 2018. "Numerical Investigation Of Modified Savonius Wind Turbine with Various Straight Blade Angle," Journal of Mechanical Engineering Research & Developments (JMERD), Zibeline International Publishing, vol. 41(3), pages 38-42, September.
    9. Ferrari, G. & Federici, D. & Schito, P. & Inzoli, F. & Mereu, R., 2017. "CFD study of Savonius wind turbine: 3D model validation and parametric analysis," Renewable Energy, Elsevier, vol. 105(C), pages 722-734.
    10. Tahani, Mojtaba & Rabbani, Ali & Kasaeian, Alibakhsh & Mehrpooya, Mehdi & Mirhosseini, Mojtaba, 2017. "Design and numerical investigation of Savonius wind turbine with discharge flow directing capability," Energy, Elsevier, vol. 130(C), pages 327-338.
    11. Krzysztof Doerffer & Janusz Telega & Piotr Doerffer & Paulina Hercel & Andrzej Tomporowski, 2021. "Dependence of Power Characteristics on Savonius Rotor Segmentation," Energies, MDPI, vol. 14(10), pages 1-18, May.
    12. Kai Lv & Yudong Xie & Xinbiao Zhang & Yong Wang, 2020. "Development of Savonius Rotors Integrated into Control Valves for Energy Harvesting," Sustainability, MDPI, vol. 12(20), pages 1-19, October.
    13. repec:zib:zjmerd:3jmerd2018-38-42 is not listed on IDEAS
    14. Elbatran, A.H. & Ahmed, Yasser M. & Shehata, Ahmed S., 2017. "Performance study of ducted nozzle Savonius water turbine, comparison with conventional Savonius turbine," Energy, Elsevier, vol. 134(C), pages 566-584.
    15. Cuevas-Carvajal, N. & Cortes-Ramirez, J.S. & Norato, Julian A. & Hernandez, C. & Montoya-Vallejo, M.F., 2022. "Effect of geometrical parameters on the performance of conventional Savonius VAWT: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 161(C).

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