基于自由涡尾迹方法的大型风力机动态响应和尾迹研究

针对大型风力机，在当作柔性和刚性风力机时，可以通过气动和结构耦合动力学用来研究两者尾迹和载荷的区别。在设计和校核阶段，需要考虑风力机结构载荷影响的动态特性和气动性能变化。采用非定常自由涡尾迹方法计算尾迹形状和气动载荷。在考虑气动载荷、惯性载荷和重力载荷影响下，分析了叶片挥舞和摆振动态响应。采用模态法建立起风力机解耦动力学方程，并且进行数值求解该方程。结果表明:风力机考虑柔性变形后，对尾迹形状、动态响应和气动性能产生一定影响。这种柔性和刚体风力机的差异表明气动结构耦合效应对风力机的设计和性能计算具有重要意义。

INVESTIGATION OF DYNAMIC RESPONSE AND WAKE ON LARGE SCALE WIND TURBINE BASED ON THE FREE WAKE METHOD

The aerodynamics and structural dynamics are combined to investigate wake and load differences for flexible and rigid large-scale wind turbines. In the design and checking stages, the dynamic situations and performance in wind turbine operations are considered. The unsteady free-wake method is used to calculate the wake geometries and the aerodynamic loads. The effect of aerodynamic loads, inertial loads and gravitational load are taken into account to obtain the dynamic characteristics of rotating flap/edgewise couple blade. The modal superposition method is also used to build the decoupled dynamics equations for the blade, which is then solved numerically. The results show that the wake, the aerodynamic performance and dynamic response are affected when the flexible of wind turbine is considered. The difference in dynamic loads between the flexible and rigid wind turbines shows that the aerodynamics/structure coupling effect is of significance in both wind turbine design and performance calculation.