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A comprehensive three-dimensional study on Darrieus vertical axis wind turbine with slotted blade to reduce flow separation

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  • Abdolahifar, Abolfazl
  • Karimian, S.M.H.

Abstract

Aerodynamic performance of different designs of slotted blade of a straight blade Darrieus vertical axis wind turbine and their corresponding flow structure are precisely analyzed using three-dimensional numerical simulation. The slots aim to transfer flow from the blade pressure side to its suction side and eventually improve the blade output torque by procrastination of flow separation, especially at low tip speed ratios (TSRs). Investigations on slot width and blade height reveal that the slot should be wide enough to successfully pass flow to confront higher volume of flow separation in larger blades. Having changed the outflow location of the slot from 2C/3 to C/6 from the blade leading edge, the location of C/3 is found to be the best by noticeable alleviation in flow separation and suppressing its development toward the blade leading edge. As a result, significant improvement in average torque coefficient is achieved. This means that at TSRs of 0.5, 1.0, and 1.5, average torque coefficient increases for the slotted blade by 93.4%, 66.1%, and 10.5%, respectively. In addition, a delay of up to 15.5° occurs in the azimuth angle of torque coefficient peak with respect to that of the base blade (without slot).

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  • Abdolahifar, Abolfazl & Karimian, S.M.H., 2022. "A comprehensive three-dimensional study on Darrieus vertical axis wind turbine with slotted blade to reduce flow separation," Energy, Elsevier, vol. 248(C).
    • Handle: RePEc:eee:energy:v:248:y:2022:i:c:s0360544222005357
    DOI: 10.1016/j.energy.2022.123632
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    References listed on IDEAS

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    4. Farzadi, Ramin & Bazargan, Majid, 2023. "3D numerical simulation of the Darrieus vertical axis wind turbine with J-type and straight blades under various operating conditions including self-starting mode," Energy, Elsevier, vol. 278(PB).

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