大功率风力机叶片模态及气动特性分析

对大功率海上风力机叶片模态特性和气动特性进行研究。建立了叶片翼型截面弯扭耦合运动微分方程,通过翼型截面坐标变换和旋转拉伸在UG中建立了国产某型6MW风力机叶片三维模型,运用Ansys/Blocklanczos法计算了叶片前6阶固有模态。在Ansys/Workbench中搭建叶片流场仿真模型,讨论了风速和气动攻角等参数对叶片振动变形的影响。结果表明各阶固有模态中叶尖部位的振型相对明显,随着风速和攻角增大,相同截面位置上的叶片振动变形逐渐增大。

Analysis of Modal and Aerodynamic of High-power Wind Turbine Blade

This work attempts to study the modal and aerodynamic of a high-power wind turbine blade. The motion differential equation with bending and twisting coupling vibration of the blade airfoil is established,a 3D model of wind turbine blade is presented based on the UG software through coordinate transformation,the first 6 natural modals of the blade are obtained based on the MSC / Patran. The flow field model of blade is built by using Ansys / Workbench,the effects of wind speed and pneumatic angle of attack on the blade vibration are analyzed. The results show that the vibration modes in the tip of the blade are more obvious,and the greater the wind speed and angle of attack,the greater the deformation of blade vibration at the same cross section position.