基于BEM的风力机叶片形变及气动性能

Aeroelastic deformation and aerodynamic performance of wind turbine blades based on BEM

为研究叶片形变对风力机气动性能的影响,提出基于叶素动量理论的叶片形变及气动性能研究方法,建立叶片在弹性形变下的形变量计算和气动载荷修正模型,通过改进的叶素动量理论与计算结构力学耦合迭代进行求解,并计算1 500 kW风力机叶片不同风速下的弹性形变量及对气动性能的影响。研究结果表明:所提算法可快速计算叶片弹性形变,用于叶片气动外形与结构设计的修正;可计算叶片等效攻角差值及其补偿角,用于优化风力发电机组变桨控制算法。

To study the blade deformation influence on the aerodynamic performance of wind turbine, analytical method of blade deformation and aerodynamic performance based on modified Blade Element Momentum theory was proposed. A deformation calculation and aerodynamic load modifying model was constructed for blades with elastic deformation, which is iteratively solved by modified Blade Element Momentum theory coupling with computational structural Dynamics. Taking 1500 kW wind turbine blade as an example, effect law of elastic blade deformation affecting the aerodynamic performance under different wind velocity was obtained. The results show that the calculation mode can quantify elastic deformation of blade with different wind speed quickly, and can be used for modifying aerodynamic shape of blade and structural design and then optimize the design of blade. Through calculating elastic deformation of blade with different wind speed, it can be used for optimizing pitch control algorithm of wind generating set.