5 MW风力发电机叶片耦合模态颤振参数研究  

Parametric Study of Coupled-mode Flutter for 5 MW Wind Turbine Blade

作　　者：张颖[1,2] 安利强[1] 王璋奇[1] ZHANG Ying;AN Liqiang;WANG Zhangqi(School of Energy Power and Mechanical Engineering,North China Electric Power University,Baoding 071003,China;College of Civil Engineering and Architecture,Hebei University,Baoding 071002,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,河北保定071003 [2]河北大学建筑工程学院,河北保定071002

出　　处：《华北电力大学学报（自然科学版）》2022年第3期119-126,共8页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51675179);中央高校基本科研业务费专项资金资助项目(2019QN133)。

摘　　要：随着海上风力发电机叶片尺寸的增加,叶片柔性增大,在运行过程中容易受到气流流动引起结构的气动弹性不稳定性。长叶片由于弯扭耦合效应可能出现耦合模态颤振,导致叶片出现断叶等重大损失。叶片的结构型式不同导致结构特性不同。叶片结构参数的变化,对叶片耦合模态颤振特性有重要的影响。基于欧拉伯努利梁理论,结合Theodorsen非定常气动荷载,通过有限元方法,建立叶片颤振特征方程。研究叶片不同区域的结构参数变化,对颤振频率和转速的影响规律。结果表明,叶尖区域的参数变化对颤振结果影响较大;三个区域的颤振速度随挥舞刚度增大而减小趋于稳定值,扭转刚度提高可以增加叶片颤振速度;回转半径与颤振速度和颤振频率成反比;质心偏移对结构的颤振频率影响最小,叶尖部位的质心偏移对叶片的颤振速度影响较大。为避免耦合模态颤振发生,提高扭转频率将成为叶片颤振设计的重要因素。The size of wind turbine rotors has increased rapidly,such long,slender,flexible blades are more susceptible to experience to flow-induced instabilities.Coupled-mode flutter is one of the destructive aeroelastic instabilities that can occur in flexible structures subjected to aerodynamic loading.Different structural types lead to different structural characteristics.Because of variation in system parameters,the structural modes coalesce at a critical flow velocity,and coupled flutter occurs.In the present work,the blade is regarded as an Euler-Bernoulli beam model.For the unsteady aerodynamic load on wind turbine blade,the Theodorsen’s theory has been adopted.The finite element method is combined to solve the characteristic equation of blade flutter.The parameter study is conducted in order to study the influence on the critical flutter speed for wind turbine blades.The results show that the structural parameters of blade tip region have the greatest influence on blade flutter frequency and velocity.The flutter speed decreases with the increasing of flapwise stiffness,while the increase of torsional stiffness can increase the flutter velocities.The radius of gyration is inversely proportional to the flutter speed and frequency.The mass offset has the least influence on the frequency and the tip of blade has the greatest influence on velocity.It can be concluded that in designing MW-size wind turbine blades,the torsional natural frequency must be considered as major design parameters to avoid the flutter.

关 键 词：翼型 区域 耦合模态 颤振频率 颤振速度 

分 类 号：O321[理学—一般力学与力学基础]