为提高垂直轴风力机（vertical axis wind turbine, VAWT）的气动效率，受圆柱后分流板可减少升阻力系数波动的启发，本文提出尾缘后分流板的新型流动控制方式，以NACA0015翼型为对象，研究分流板长度以及其与翼型的间隙对翼型气动性能的影响；同时探究分流板在不同叶尖速比工况下对VAWT气动效率的影响。结果表明：尾缘后分流板对翼型可起到增升减阻的效果，带尾缘后分流板的VAWT可有效提高其风能利用率，在低尖速比工况下，风能利用率均高于原始风力机，在高尖速比工况下，风能利用率最大提高约25.78%。同时发现，尾缘后分流板的存在有利于VAWT的尾流恢复，在相同尖速比工况下，带有尾缘后分流板的VAWT的尾迹长度短于原始风力机。

In order to improve the aerodynamic efficiency of a vertical axis wind turbine (VAWT), inspired by the fact that the cylindrical rear flap can reduce the fluctuation of the lift drag coefficient, a new flow control method for the trailing edge flap is proposed. Taking the NACA0015 airfoil as the object, the influence of the length of the flap and the gap between the flap and the airfoil on the aerodynamic performance of the airfoil is studied. At the same time, the influence of the flap on the aerodynamic efficiency of the VAWT under different tip speed ratio conditions was explored. The results show that the VAWT with a trailing edge flap can effectively improve the wind energy utilization rate of the airfoil. The wind energy utilization rate is higher than that of the original wind turbine under the low tip speed ratio condition, and the maximum increase in wind energy utilization is about 25.78% under the high tip speed ratio condition. At the same time, it is found that the presence of the trailing edge flap is beneficial to the wake recovery of the VAWT, and the wake length of the VAWT with the trailing edge flap is shorter than that of the original wind turbine under the same tip speed ratio condition.

国家自然科学基金（51976131）