RESEARCH ON DRAG REDUCTION MECHANISM OF ARC-SHAPED GROOVE UNDER THREE-DIMENSIONAL ROTATION EFFECT

Yang Rui; Shi Zhenpeng; Tian Nan; Zeng Xueren; Fang Liang; Bao Guangchao

doi:10.19912/j.0254-0096.tynxb.2024-0368

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (7) : 346-352. DOI: 10.19912/j.0254-0096.tynxb.2024-0368

Special Topics of Academic Papers at the 61th Annual Meeting of the China Association for Science and Technology

RESEARCH ON DRAG REDUCTION MECHANISM OF ARC-SHAPED GROOVE UNDER THREE-DIMENSIONAL ROTATION EFFECT

Yang Rui^1,2, Shi Zhenpeng¹, Tian Nan³, Zeng Xueren³, Fang Liang³, Bao Guangchao³

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Abstract

To investigate the drag reduction mechanism of grooves under three-dimensional rotation, the NREL 5 MW wind turbine is taken as the research object, and transverse arc-shaped grooves are arranged at 18%-20% spanwise position on the blade. The aerodynamic performance of the three-dimensional sectional airfoil and the corresponding two-dimensional airfoil under different operating conditions are calculated using numerical simulation methods. The surface pressure coefficients of the section airfoil are compared with those of the two-dimensional airfoil, and the flow field status is analyzed. The results show that the arc-shaped grooves on the section airfoil can improve the pressure distribution of the airfoil and effectively suppress flow separation within a certain range of wind speeds, thereby increasing the lift-to-drag ratio. However, the suppression of flow separation by the arc-shaped grooves on the two-dimensional airfoil is not significant. By comparing the flow status inside the two-dimensional grooves and three-dimensional grooves, it is found that the three-dimensional rotational effect inside the grooves is the fundamental reason for drag reduction. Before stall, the vortices inside the grooves carry high-speed fluid out and inject it into the boundary layer, resulting in accelerated flow velocity behind the grooves. After stall, the vortices inside the grooves capture low-energy fluid, both of which improve the pressure distribution of the section airfoil.

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wind turbines / rotation flow / drag reduction / numerical simulation / aerodynamic performance

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Yang Rui, Shi Zhenpeng, Tian Nan, Zeng Xueren, Fang Liang, Bao Guangchao. RESEARCH ON DRAG REDUCTION MECHANISM OF ARC-SHAPED GROOVE UNDER THREE-DIMENSIONAL ROTATION EFFECT[J]. Acta Energiae Solaris Sinica. 2025, 46(7): 346-352 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0368

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