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| Effect of concave-out′s asymmetric airfoil on flow field of H-type vertical axis wind turbine |
| LI Shoutu1,2,3*, YANG Congxin1,2,3, SHI Guangtai4, ZHANG Xuyao1,2 |
| 1.College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Gansu Provincial Technology Centre for Wind Turbines, Lanzhou, Gansu 730050, China; 3.Key Laboratory of Fluid Machinery and System, Gansu Pro-vince, Lanzhou, Gansu 730050, China; 4.College of Energy and Power Engineering, Xihua University, Chengdu, Sichuan 610039, China |
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Abstract The H-type vertical axis wind turbine(H-VAWT)is a classic lift-driven vertical axis wind turbine, and it has cluster developing potential and advantages.The research method of numerical simu-lation is adopted and the two-dimensional model is established, flow field structure of H-VAWT of the concave-out′s asymmetric airfoils is analyzed, as well as the flow field distribution is analyzed when the blade numbers of H-VAWT of the concave-out′s asymmetric airfoils change. The results showed that the wake turbulence of H-VAWT of the concaver-out′s asymmetric airfoils is more intense than that of the concaver-in′s asymmetric airfoils, and the recovery capability of wake is weaker, thus influencing the distribution of H-VAWT in the wind field, but regardless of the concave-out and concave-in, the distribution of flow field is basically the same that of out flow field near the turbine; With the increase of blade number, the wake turbulence intensity resulting from H-VAWT of the concave-out′s asymmetric airfoils increases, but regardless of the concave-out and concave-in,the turbulence produced is basically the same when blade number is 3.
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Received: 20 June 2017
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