为提高垂直轴风力机气动效率，提出在翼型尾缘布置凹槽-襟翼结构，并通过主动控制实现凹槽-襟翼结构随风轮相位角变化的机制。基于该控制机制，以NACA0021翼型为研究对象，采用CFD方法进行数值模拟，研究主动式凹槽-襟翼对垂直轴风力机气动性能的影响。结果表明：与静态凹槽-襟翼结构相比，主动式凹槽-襟翼能有效提高垂直轴风力机风能利用率，同时降低最佳尖速比风轮转速，有利于提高运行稳定性，增大低尖速比下启动力矩以及降低气动噪声；当尖速比大于最佳尖速比时，主动式凹槽-襟翼对风力机气动性能提升效果逐渐减弱。

In order to improve the aerodynamic efficiency of the vertical axis wind turbine,a mechanism was proposed to arrange a dimpleflap structure at the trailing edge of the airfoil,and to change the phase angle of the dimpleflap structure by means of active control.Based on the control mechanism,NACA0021 airfoil was taken as the research object,and CFD method was used for numerical simulation to study the influence of active dimpleflap on aerodynamic performance of vertical axis wind turbine.The results show that: compared with the static dimpleflap structure,the active dimpleflap structure can effectively improve the wind energy utilization rate of the vertical axis wind turbine,and at the same time reduce the speed of the wind wheel with the optimal tip ratio,which is beneficial to improve the operation stability,increase the starting torque and reduce the aerodynamic noise under the low tip ratio.When the tip speed ratio is larger than the optimal tip speed ratio,the effect of active dimpleflap on aerodynamic performance improvement of wind turbine is gradually weakened.

TK83

国家自然科学基金（51976131，51676131）；国际（地区）合作与交流项目（51811530315）；上海“科技创新行动计划”地方院校能力建设项目（19060502200）