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Aerodynamic Characteristics of Airfoil and Vertical Axis Wind Turbine Employed with Gurney Flaps

Author

Listed:
  • Yosra Chakroun

    (Institute of Aerodynamics and Gas Dynamics, University of Stuttgart, Pfaffenwaldring 21, 70569 Stuttgart, Germany
    These authors contributed equally to this work.)

  • Galih Bangga

    (Institute of Aerodynamics and Gas Dynamics, University of Stuttgart, Pfaffenwaldring 21, 70569 Stuttgart, Germany
    These authors contributed equally to this work.)

Abstract

In the present studies, the effects of Gurney flaps on aerodynamic characteristics of a static airfoil and a rotating vertical axis wind turbine are investigated by means of numerical approaches. First, mesh and time step studies are conducted and the results are validated with experimental data in good agreement. The numerical solutions demonstrate that the usage of Gurney flap increases the airfoil lift coefficient C L with a slight increase in drag coefficient C D . Furthermore, mounting a Gurney flap at the trailing edge of the blade increases the power production of the turbine considerably. Increasing the Gurney flap height further increases the power production. The best performance found is obtained for the maximum height used in this study at 6% relative to the chord. This is in contrast to the static airfoil case, which shows no further improvement for a flap height greater than 0.5 % c . Increasing the angle of the flap decreases the power production of the turbine slightly but the load fluctuations could be reduced for the small value of the flap height. The present paper demonstrates that the Gurney flap height for high solidity turbines is allowed to be larger than the classical limit of around 2% for lower solidity turbines.

Suggested Citation

  • Yosra Chakroun & Galih Bangga, 2021. "Aerodynamic Characteristics of Airfoil and Vertical Axis Wind Turbine Employed with Gurney Flaps," Sustainability, MDPI, vol. 13(8), pages 1-22, April.
    • Handle: RePEc:gam:jsusta:v:13:y:2021:i:8:p:4284-:d:534665
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    References listed on IDEAS

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    3. Zhu, Haitian & Hao, Wenxing & Li, Chun & Luo, Shuai & Liu, Qingsong & Gao, Chuang, 2021. "Effect of geometric parameters of Gurney flap on performance enhancement of straight-bladed vertical axis wind turbine," Renewable Energy, Elsevier, vol. 165(P1), pages 464-480.
    4. Zhang, Ye & Ramdoss, Varun & Saleem, Zohaib & Wang, Xiaofang & Schepers, Gerard & Ferreira, Carlos, 2019. "Effects of root Gurney flaps on the aerodynamic performance of a horizontal axis wind turbine," Energy, Elsevier, vol. 187(C).
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    Cited by:

    1. Luke Sakamoto & Tomohiro Fukui & Koji Morinishi, 2022. "Blade Dimension Optimization and Performance Analysis of the 2-D Ugrinsky Wind Turbine," Energies, MDPI, vol. 15(7), pages 1-14, March.
    2. Galih Bangga, 2022. "Progress and Outlook in Wind Energy Research," Energies, MDPI, vol. 15(18), pages 1-5, September.

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