风力机叶片二元翼段静气动弹性机理

针对风力机叶片翼型静气动弹性的发散速度、载荷重新分布等问题，在线弹性范围内，基于气动弹性力学理论，推导出适用于风力机叶片二元翼段静气动弹性的基本方程.以攻角为输入量，压力为输出量，翼型的弹性扭角为系统的反馈量，建立了风力机叶片弹性翼型的气动弹性反馈模型.在危险风速工况下，对3种典型翼型的风力机叶片二元翼段进行了计算分析，得到了扭转刚度、刚心与气动中心距离对风力机叶片二元翼段的发散速度、附加扭角和升力分布的影响.研究了不同翼型对风力机叶片二元翼段附加扭角和升力分布的影响，结果表明，当扭转刚度较小时，附加扭角的增加在一定程度上提高了翼型的气动性能；当扭转刚度较大时，附加扭角增加较小，对翼型的气动性能影响较小.

Static aeroelastic mechanism of two dimensional airfoil section for wind turbine blade

In order to solve the problems in the static aeroelastic divergence speed and load redistribution of airfoils for wind turbine blades, the static aeroelastic basic equations suitable for the two dimensional （2D） airfoil sections of wind turbine blades were derived based on the aeroelastic theory within the linear elastic range. Through taking the attack angle as the input, pressure as the output and elastic twist angle of airfoils as the feedback of system, an aeroelastic feedback model for elastic airfoils of wind turbine blades was established. In the operating condition with dangerous wind speed, the computation and analysis for the 2D airfoil sections of wind turbine blades with three kinds of typical airfoils were performed. In addition, the effect of torsion stiffness and distance from stiffness center to aerodynamic center on the divergence speed, additional twist angle and lift force distribution of 2D airfoil sections of wind turbine blades was determined. And the influence of different airfoils on the additional twist angle and lift force distribution of 2D airfoil sections of wind turbine blades was studied. The results show that under the smaller torsion stiffness, the aerodynamic performance of airfoils gets improved to a certain extent with increasing the additional twist angle. When the torsion stiffness is larger, the additional twist angle slightly increases, and has little effect on the aerodynamic performance of airfoils.