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Effect of flow-deflecting-gap blade on aerodynamic characteristic of vertical axis wind turbines

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  • Zhu, Haitian
  • Hao, Wenxing
  • Li, Chun
  • Ding, Qinwei

Abstract

In order to improve stall characteristics more effectively or eliminate dynamic stall in a revolution of vertical axis wind turbine, three kinds of novel flow-deflecting-gap (FDG) blade were designed and investigated numerically, including two-side FDG blade, toward-outside FDG blade and toward-inside FDG blade. Firstly, the aerodynamic characteristics of isolated flow-deflecting-gap blade were obtained and its effect was illustrated. Then, the investigation on aerodynamic characteristic of novel SB-VAWT was conducted. The obtained results indicated that compared to clean airfoil, FDG enhances the stalling angle of attack (AOA) by 2° and increases lift-drag ratio at high AOA. Furthermore, FDG significantly decreases the frequency of vortex shedding and greatly reduces amplitude of lift oscillation. For a vertical axis wind turbine, toward-inside FDG can efficiently decrease the optimal tip-speed ratio and improve the aerodynamic performance at low tip-speed ratio. Additionally, an increase of 10.21% of torque coefficient is caused by toward-inside FDG. Jet flow in FDG towards leading edge offsets the swirling flow over the suction surface and the trailing-edge vortex produced by bluff edge is also weakened or even eliminated by FDG.

Suggested Citation

  • Zhu, Haitian & Hao, Wenxing & Li, Chun & Ding, Qinwei, 2020. "Effect of flow-deflecting-gap blade on aerodynamic characteristic of vertical axis wind turbines," Renewable Energy, Elsevier, vol. 158(C), pages 370-387.
    • Handle: RePEc:eee:renene:v:158:y:2020:i:c:p:370-387
    DOI: 10.1016/j.renene.2020.05.092
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    References listed on IDEAS

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