NUMERICAL STUDY OF VERTICAL AXIS WIND TURBINE WITH DIMPLE-FLAPS BASED ON ORTHOGONAL TEST

Li Gen; Liu Qingsong; Li Chun; Miao Weipao; Yue Minnan

doi:10.19912/j.0254-0096.tynxb.2021-0918

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (5) : 294-301. DOI: 10.19912/j.0254-0096.tynxb.2021-0918

NUMERICAL STUDY OF VERTICAL AXIS WIND TURBINE WITH DIMPLE-FLAPS BASED ON ORTHOGONAL TEST

Li Gen¹, Liu Qingsong¹, Li Chun^1,2, Miao Weipao¹, Yue Minnan¹

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Abstract

In order to improve the aerodynamic characteristics of vertical axis wind turbine, the dimple-flap was studied in this paper. Taking NACA0021 airfoil as the research object, orthogonal experimental design was used to combine the parameters such as Gurney flap height, Gurney flap position and dimple diameter. The aerodynamic performance and flow field structure of vertical-axis wind turbine were studied by numerical calculation, and the dimple-flap flow control mechanism and its effect on vertical axis wind turbine were analyzed. The results show that the height of Gurney flap is the main factor affecting the aerodynamic performance of the vertical axis, and the best effect is achieved when the height of the flap is 1.75%c, the position is 0.05%c and the dimple diameter is 0.15%c. At the same time, dimple-flap can accelerate the flow on the suction surface of airfoil by changing the trailing edge kutta conditions, so as to improve the flow separation, increase the airfoil surface differential pressure, and improve the aerodynamic performance of the vertical axis wind turbine. The effect of dimple-flap on vertical axis wind turbine is more obvious at low tip speed ratio. When the tip speed ratio is 2.33, the average wind energy utilization coefficient of dimple-flap vertical axis wind turbine can increase by 35.82% compared with the original airfoil.

Key words

vertical axis wind turbines / dimple-flap / flow control / tip speed ratio / power coefficient

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Li Gen, Liu Qingsong, Li Chun, Miao Weipao, Yue Minnan. NUMERICAL STUDY OF VERTICAL AXIS WIND TURBINE WITH DIMPLE-FLAPS BASED ON ORTHOGONAL TEST[J]. Acta Energiae Solaris Sinica. 2023, 44(5): 294-301 https://doi.org/10.19912/j.0254-0096.tynxb.2021-0918

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