为改善垂直轴风力机效率较低及自启动困难问题,提出一种在迎风区内开启,背风区内闭合的主动式偏转襟翼结构。以NACA0021为基础翼型,采用计算流体力学方法对偏转襟翼垂直轴风力机叶片瞬时转矩、风能利用系数、平均切向力及压力场进行数值分析。结果表明：偏转襟翼结构可使叶片表面压差增大,叶片转矩升高,垂直轴风力机在低叶尖速比范围内的风能利用系数得到不同程度的提升；当叶尖速比为2.5,襟翼水平长度为0.4c时,主动式偏转襟翼垂直轴风力机较原始垂直轴风力机最高风能利用系数可提升13.9%。

In order to improve the low efficiency and difficulty of self-starting of vertical axis wind turbines, an active deflection flap structure that opens in the windward area and closes in the leeward area is proposed. Based on NACA0021, the instantaneous torque, wind energy utilization coefficient, average tangential force and pressure field of wind turbine blades with vertical axis of deflected flaps were numerically analyzed by computational hydrodynamic method. The results show that the flap structure can increase the blade surface pressure difference, increase the blade torque, and improve the wind energy utilization coefficient of the vertical axis wind turbine in the range of low blade tip speed ratio. When the blade tip velocity ratio is 2.5 and the horizontal length of the flap is 0.4c, the maximum wind energy utilization coefficient of the active deflection flap vertical axis wind turbine is 13.9% higher than that of the original vertical axis wind turbine.

TK83

国家自然科学基金(51976131；51676131)；上海“科技创新行动计划”地方院校能力建设项目(19060502200)