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在旋转的作用下,流动分离向下游延迟,结果大大改变了风力机桨叶的气动特性,这种由旋转所带来的影响被称为三维旋转效应。本文以桨叶表面边界层理论分析的结果为基础,给出了三维旋转效应对气流分离影响的解析关系,将其与非定常气动和动态失速模型相结合,并适当考虑旋转条件下桨叶翼型载荷的分布特性,使其能计算三维旋转效应下风力机桨叶的非定常气动特性.通过算例表明,当这一三维旋转效应模型与非定常动态失速模型耦合后再计算桨叶非定常气动特性时,能大大改善计算结果。
Under the action of rotation, the flow separation is delayed to the downstream, and as a result, the aerodynamic characteristics of the wind turbine blade are greatly changed. The effect caused by the rotation is called the three-dimensional rotation effect. Based on the theoretical analysis of the boundary layer on the blade surface, this paper gives the analytical relationship between the three-dimensional rotation effect and the airflow separation. Combining this with the unsteady aerodynamic and dynamic stall models, Type load can be used to calculate the unsteady aerodynamic characteristics of wind turbine blades under the three-dimensional rotation effect.Through a numerical example, it is shown that when the three-dimensional rotation effect model is coupled with the unsteady dynamic stall model, Pneumatic characteristics, can greatly improve the calculation results.