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

Abolfazl Abdolahifar and S.M.H. Karimian

Energy, 2022, vol. 248, issue C

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).

Keywords: Darrieus wind turbine; Straight blade; Flow control; Slot; Flow separation; Dynamic stall (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:248:y:2022:i:c:s0360544222005357

DOI: 10.1016/j.energy.2022.123632

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