水平轴风力机叶片的弯扭耦合气弹稳定性研究  

Aeroelastic stability of a horizontal axis wind turbine blade with bending-torsion coupled

作　　者：任勇生[1] 张明辉[1] 

机构地区：[1]山东科技大学机械电子工程学院,青岛266510

出　　处：《振动与冲击》2010年第7期196-200,共5页Journal of Vibration and Shock

基　　金：山东省自然科学基金资助项目(Y2006F37)

摘　　要：研究水平轴风力机叶片的经典颤振稳定性特性。在导出质量刚度均匀分布的旋转挥舞/摆振/扭转叶片的耦合振动偏微分方程组基础上,引入扩展的Theodorsen模型描述非定常气动力的作用。联合采用Galerkin法、特征值法和时间域积分法对所建立的叶片气弹模型进行求解。通过数值分析获得叶片的挥舞弯曲模态、摆振弯曲模态和扭转模态的根轨迹曲线,分析了叶片面内刚度、扭转刚度和预锥角对叶片气弹稳定性的影响。特征值法稳定性的计算结果的精确度和可靠性通过分析模态展开式中模态截断个数N对颤振边界收敛性的影响,得到验证。稳定性分析的时间域数值积分结果的一致性进一步说明特征值法稳定性计算结果正确性。The linear stability characteristics of a horizontal axis wind turbine blade with flap-lag-torsion were investigated.The partial differential equations of the elastic rotating cantilever blade subjected to combined flap/lead-lag/torsion action were obtained.The aerodynamic forces were introduced from the extensive Theodorsen's theory based on a quasi-steady approximation.Galerkin's method together with eigenvalue analysis and time domain integration were used for stability analysis.The locuses of roots of flap-lead,lag and torsion fundamental modes with increasing wind speed were obtained.The effects of inplane configurations,torsion natural frequency and precone angle on the aeroelastic stability of the blade were analyzed.The effect of the number of modal shapes on the accuracy and convergence was also examined.Finally,the results based on eigenvalue analysis were compared with those from time simulations of deflections of the blade.

关 键 词：气弹性 风力机叶片 旋转梁 结构动力学 颤振 

分 类 号：V211.47[航空宇航科学与技术—航空宇航推进理论与工程]