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基于状态空间描述的Beddoes-Leishman动态失速模型,对风力机翼型进行非定常气动力分析.考虑到风力机翼型工作时的实际情况,在模型中忽略了可压缩性效应和起始于翼型前缘的流动分离.模型考虑了气流的近尾流效应和在失速区域的后缘分离效应.模型用4个气动状态来描述非定常气动力系数动力学,其中两个用于描述近尾流效应中的时间迟滞,另两个用于描述后缘分离效应.采用模型对做简谐变桨运动的FFA-W3-241风力机专用翼型进行了非定常气动力分析.数值计算结果与实验值吻合良好,说明模型能较好地描述风力机翼型的非定常气动特性.将动态失速数值计算模块与已有的风力机气动与结构分析软件集成,利用软件对一台1.5MW变速变桨距风力机的发电工况进行了仿真.仿真结果表明,翼型的非定常气动特性对动态载荷计算结果影响很大,因此在风力机的设计过程中应该予以充分考虑.
The Beddoes-Leishman dynamic stall model based on state space description is applied to unsteady aerodynamic analysis of wind turbine airfoil. Considering the actual situation of wind turbine airfoil, ignoring the compressibility effect in the model and starting from the wing The model considers the near-wake effect of the airflow and the trailing edge separation effect in the stall area.The model uses four aerodynamic states to describe the unsteady aerodynamic coefficient dynamics, two of which are used to describe the near-tail flow And the other two are used to describe the trailing edge separation effect.The unsteady aerodynamic analysis of FFA-W3-241 wind turbine dedicated airfoil with simple harmonic pitch motion is carried out by using the model.The numerical results are compared with The experimental results are in good agreement with each other, which shows that the model can describe the unsteady aerodynamic characteristics of wind turbine airfoils well.The dynamic numerical calculation module is integrated with the existing wind turbine aerodynamic and structural analysis software, and a 1.5MW variable speed variable The simulation results show that the unsteady aerodynamic characteristics of the airfoil have a great influence on the dynamic load calculation results. Therefore, during the design of the wind turbine, Be fully considered.