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Vortical structures in the wake of the savonius wind turbine by the discrete vortex method

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  • Afungchui, David
  • Kamoun, Badreddinne
  • Helali, Ali

Abstract

This paper treats the vortex shedding phenomenon of a savonius wind turbine, whose knowledge is primordial in correctly calculating the airloads on the blades. The specific aim being to numerically predict the disposition and geometry of the vortical structures in the wake of the savonius rotor whose existence has been visualised by a number of experimentalists. In the numerical approach, the blade is represented by discrete bound vortices while the wake is generated in a time stepping calculation as an emission of free vortices. The calculations are enhanced by the Newmann boundary condition coupled to the Kutta–Joukowsky condition and the Kelvin's theorem for the conservation of circulation. The convection of the vortices in the wake is accomplished through a predictor corrector integration scheme. A code has been developed which predicts the wake structure to be in good agreement with the experimental visualizations: For low tip speed ratios, the wake consists of a series of three discrete vortical structures while at higher tip speed ratios, the characteristic structure is the presences of a central vortex.

Suggested Citation

  • Afungchui, David & Kamoun, Badreddinne & Helali, Ali, 2014. "Vortical structures in the wake of the savonius wind turbine by the discrete vortex method," Renewable Energy, Elsevier, vol. 69(C), pages 174-179.
    • Handle: RePEc:eee:renene:v:69:y:2014:i:c:p:174-179
    DOI: 10.1016/j.renene.2014.03.038
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    References listed on IDEAS

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    1. Kamoun, Badreddine & Afungchui, David & Chauvin, Alain, 2005. "A wind turbine blade profile analysis code based on the singularities method," Renewable Energy, Elsevier, vol. 30(3), pages 339-352.
    2. Afungchui, David & Kamoun, Baddreddinne & Helali, Ali & Ben Djemaa, Abdellatif, 2010. "The unsteady pressure field and the aerodynamic performances of a Savonius rotor based on the discrete vortex method," Renewable Energy, Elsevier, vol. 35(1), pages 307-313.
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    Cited by:

    1. Chen, Jian & Chen, Liu & Xu, Hongtao & Yang, Hongxing & Ye, Changwen & Liu, Di, 2016. "Performance improvement of a vertical axis wind turbine by comprehensive assessment of an airfoil family," Energy, Elsevier, vol. 114(C), pages 318-331.
    2. 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.
    3. Fanel Dorel Scheaua, 2020. "Comparative Numerical Analysis on Vertical Wind Turbine Rotor Pattern of Bach and Benesh Type," Energies, MDPI, vol. 13(9), pages 1-20, May.
    4. Can Kang & Wisdom Opare & Chen Pan & Ziwen Zou, 2018. "Upstream Flow Control for the Savonius Rotor under Various Operation Conditions," Energies, MDPI, vol. 11(6), pages 1-20, June.
    5. Wang, Lu & Yeung, Ronald W., 2016. "On the performance of a micro-scale Bach-type turbine as predicted by discrete-vortex simulations," Applied Energy, Elsevier, vol. 183(C), pages 823-836.
    6. Bethi, Rajagopal Vinod & Mitra, Santanu & Kumar, Pankaj, 2021. "An OpenFOAM based study of Savonius turbine arrays in tunnels for power maximisation," Renewable Energy, Elsevier, vol. 179(C), pages 1345-1359.

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