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Steady wind performance of a 5 kW three-bladed H-rotor Darrieus Vertical Axis Wind Turbine (VAWT) with cambered tubercle leading edge (TLE) blades

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  • Lositaño, Ian Carlo M.
  • Danao, Louis Angelo M.

Abstract

The performance of a 5 kW three-bladed H-rotor Darrieus Vertical Axis Wind Turbine with cambered Tubercle Leading Edge NACA 0025 blades was established using computational fluid dynamics. 3D models and simulations of the VAWT were realized using CAD and CAE software, after which post-processing analyses provided understanding of the VAWT and blade flow physics. Results showed the TLE to be detrimental to flow and performance of a cambered VAWT. Using torque, lift and drag data, the cambered TLE VAWT was shown to deviate significantly against the cambered VAWT over one complete converged rotation. Cambered TLE VAWT blades encounter reduced lift forces and increased drag forces leading to lowered and eventual reversal of torque values. The z-vorticity and Q-criterion visualizations further supported the numerical results with the post-processed images showing vortices the size of the blade chord generated at blade wakes of the cambered TLE. The vortices emanate from the flow separation at the blade crests creeping in at the blade trailing edge at 75° azimuth and reaching halfway through the blade chord length at 106° azimuth. Spanwise separation was observed to be restricted at blade crests. The resulting flow degradation translated to the poor performance of the wind turbine.

Suggested Citation

  • Lositaño, Ian Carlo M. & Danao, Louis Angelo M., 2019. "Steady wind performance of a 5 kW three-bladed H-rotor Darrieus Vertical Axis Wind Turbine (VAWT) with cambered tubercle leading edge (TLE) blades," Energy, Elsevier, vol. 175(C), pages 278-291.
    • Handle: RePEc:eee:energy:v:175:y:2019:i:c:p:278-291
    DOI: 10.1016/j.energy.2019.03.033
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    References listed on IDEAS

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    1. Howell, Robert & Qin, Ning & Edwards, Jonathan & Durrani, Naveed, 2010. "Wind tunnel and numerical study of a small vertical axis wind turbine," Renewable Energy, Elsevier, vol. 35(2), pages 412-422.
    2. Bausas, Michael D. & Danao, Louis Angelo M., 2015. "The aerodynamics of a camber-bladed vertical axis wind turbine in unsteady wind," Energy, Elsevier, vol. 93(P1), pages 1155-1164.
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    1. Zhang, Yanfeng & Li, Qing'an & Zhu, Xinyu & Song, Xiaowen & Cai, Chang & Zhou, Teng & Kamada, Yasunari & Maeda, Takao & Wang, Ye & Guo, Zhiping, 2022. "Effect of the bionic blade on the flow field of a straight-bladed vertical axis wind turbine," Energy, Elsevier, vol. 258(C).

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    Keywords

    TLE; Camber; VAWT; CFD;
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