针对垂直轴风力机运行过程中存在显著流动分离现象,对其叶片边界层施加吸气控制可改善气动性能。为真实反映实际流体属性及尾涡流场,基于计算流体动力学方法,采用高精度三维模拟,对比分析不同吸气控制策略下垂直轴风力机气动性能与流场特性,结果表明：边界层吸气可增强边界层抗逆压梯度能力,令前缘流体在大攻角下依旧附着,延迟流动分离,可有效提升垂直轴风力机气动特性。内侧吸气控制在各尖速比下风能利用系数平均提升78.53%,采用不同策略可大幅提升迎风区叶片转矩,为29.46%。

Aiming at the significant flow separation phenomenon during the operation of vertical axis wind turbine, the boundary suction control is applied to the blade boundary layer to improve its aerodynamic performance. In order to truly reflect the actual fluid properties and the wake vortex field, based on the computational fluid dynamics method, the aerodynamic performance and flow field characteristics of the suction control and the original vertical axis wind turbine are compared and analyzed by high-precision three-dimensional simulation. The results show that the boundary layer suction can enhance the ability of the boundary layer to resist the adverse pressure gradient, so that the leading edge fluid is still attached at a large angle of attack, and the flow separation is delayed, which can effectively improve the aerodynamic characteristics of the vertical axis wind turbine. The inner suction control increases the wind energy utilization coefficient by 78.53% on average at each tip speed ratio, and greatly increases the blade torque in the windward area.

TK83