风力机叶片非定常气动力降阶模型方法

Reduced Order Model for Unsteady Aerodynamic of Wind Turbine Blade

基于计算流体力学(Comptational fluid dynamic,CFD)的非定常气动力降阶模型方法,建立起叶段振动状态下的非定常气动力模型,用来模拟叶片变形与气流耦合作用下的附加非定常气动力,实现了叶段在旋转过程中的非定常气动特性建模。通过与CFD结果的校验,验证了方法的可行性,分析了模型对阶跃幅值、风速及振动频率等参数变化的敏感性,然后将方法推广至多叶段模型,并结合结构动力学方程给出多叶段模型的气动弹性响应历程。

A reduced order model is adopted for unsteady aerodynamic force of wind turbine blade to simulate the additional unsteady aerodynamic force from the structure vibration coupled with fluid.The unsteady aerodynamic model of rotational elements is also established.The feasibility of the model is verified by comptational fluid dynamic（CFD）method.Then the effects of some parameters,such as step amplitude,wind velocity,and frequency,on the model are analyzed.The aerodynamic force modeling is further applied to multiple blade elements combined with structural dynamics equations to simulate the aeroelastic response of blade elements.