Effect of wind speed and airfoil camber on aerodynamic performance of vertical axis wind turbines
SONG Chenguang1,2, ZHAO Zhenzhou3*, WU Guoqing2,4, ZHU Weinan1,2, LIU Zewei1
1.School of Electrical Engineering, Nantong University, Nantong, Jiangsu 226019, China; 2.Jiangsu Engineering Center for Wind Energy Application Technology, Nantong, Jiangsu 226019, China; 3.School of Energy and Electrical Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 4.School of Mechanical Engineering, Nantong University, Nantong, Jiangsu 226019, China
Abstract：To investigate the effect of wind speed and airfoil camber on the aerodynamic performance of vertical axis wind turbine(VAWT), three wind speeds such as 4, 8 and 12 m/s were specified as the design speeds and four airfoils namely NACA0015, NACA2415, NACA4415 and NACA6415 were selected as the design airfoils. 2D unsteady numerical simulations of a small H-type VAWT with these airfoils under these wind speeds were conducted to assess the CP-λ, Pa-n and Qa-n characteristic curves. The results showed that wind speed and airfoil camber both had a great impact on the aerodynamic performance. Wind speed mainly affects the CP(Pa)value of rotor, range of tip speed ratio and efficient operation region width, which all increase with increasing wind speed. Airfoil camber mainly affects the CPmax value of rotor, range of tip speed ratio, efficient operation region width, CP(Pa)value of rotor, economy and starting performance. However, the wind speed almost has no effect on the determination of airfoil camber. Considering various factors observed, the airfoil with a camber of 0-2% is the best choice for VAWTs.
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