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Numerical and experimental study of a helical Savonius wind turbine and a comparison with a two-stage Savonius turbine

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  • Kothe, Leonardo Brito
  • Möller, Sérgio Viçosa
  • Petry, Adriane Prisco

Abstract

In this paper, the aerodynamic performance of a helical Savonius rotor model with 180° twisted blades is investigated numerically and experimentally. It is also performed a comparison of results with a two-stage Savonius with similar parameters. The experimental study is conducted in the aerodynamic tunnel Prof. Debi Pada Sadhu at the Fluid Mechanics Laboratory of UFRGS. Numerical simulations are performed using the Finite Volumes Method performed by the solution of the Reynolds Averaged Navier-Stokes (RANS) using the k-ω SST turbulence model. The static torque, dynamic torque and power coefficients are compared. Results show that the turbine has a positive static torque coefficient for any studied rotor angles. The dynamic torque coefficient of the turbine shows less torque variation along each rotation in comparison with a two-stage turbine, reaching the maximum value for a tip speed ratio (λ) of 0.2 for the experimental and numerical cases. The helical turbine, despite having a more complex manufacturing process than the two-stage turbine, presents stable torque and higher power coefficient. The maximum power coefficient of the rotor is obtained for λ of 0.65 for both cases. The numerical simulations and the experimental results present differences between 2.34% and 12.5% in CT and CP values.

Suggested Citation

  • Kothe, Leonardo Brito & Möller, Sérgio Viçosa & Petry, Adriane Prisco, 2020. "Numerical and experimental study of a helical Savonius wind turbine and a comparison with a two-stage Savonius turbine," Renewable Energy, Elsevier, vol. 148(C), pages 627-638.
    • Handle: RePEc:eee:renene:v:148:y:2020:i:c:p:627-638
    DOI: 10.1016/j.renene.2019.10.151
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    References listed on IDEAS

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    1. Kamoji, M.A. & Kedare, S.B. & Prabhu, S.V., 2009. "Experimental investigations on single stage modified Savonius rotor," Applied Energy, Elsevier, vol. 86(7-8), pages 1064-1073, July.
    2. Jeon, Keum Soo & Jeong, Jun Ik & Pan, Jae-Kyung & Ryu, Ki-Wahn, 2015. "Effects of end plates with various shapes and sizes on helical Savonius wind turbines," Renewable Energy, Elsevier, vol. 79(C), pages 167-176.
    3. Akwa, João Vicente & Vielmo, Horácio Antonio & Petry, Adriane Prisco, 2012. "A review on the performance of Savonius wind turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 16(5), pages 3054-3064.
    4. Damak, A. & Driss, Z. & Abid, M.S., 2013. "Experimental investigation of helical Savonius rotor with a twist of 180°," Renewable Energy, Elsevier, vol. 52(C), pages 136-142.
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