非对称翼型反装对H型垂直轴风力机流场分布的影响

H型垂直轴风力机(H-VAWT)是典型的升力型垂直轴风力机,且有集群式发展的潜力和优势.文中采用数值模拟的研究方法,建立二维模型,对比分析了使用非对称翼型的H-VAWT叶片反装时的流场结构,以及反装时叶片数对H-VAWT流场分布的影响.结果表明:对于非对称翼型的H-VAWT,叶片反装所产生的尾流湍流强度较叶片正装时大,且尾流的恢复能力差,进而影响到H-VAWT在风场中的布局,但是叶片的正装和反装对H-VAWT附近外流场中Y方向上流场分布的影响基本一致;随着叶片数的增加,反装叶片的H-VAWT本身产生尾流的湍流强度增加,这增强了下风轮区域叶片和上风轮区域叶片所产生湍流的相互作用,但是叶片数为3时,叶片的正装和反装所产生的湍流差别不大.

Effect of concave-out′s asymmetric airfoil on flow field of H-type vertical axis wind turbine

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.