风力机叶片及塔架流固耦合分析

Fluid-structure coupling analysis for blades and tower of wind power

采用ANSYS Workbench软件,对国内某200 kW水平轴风力机流场进行数值模拟,计算出风力机叶片表面的压力分布和旋转域速度分布。通过对X方向不同截面总压、湍动能和涡粘性分布情况进行分析,得到了风力机下风向上述3个物理量的变化规律。将风力机流场的计算结果施加到固体计算中,进行风力机叶片和塔架整体的流固耦合模拟计算,分析得出风力机叶片、塔架应力和变形量的分布情况。最后进行模态分析,得到其前十阶振动频率和振型,为风力机安全运行和叶片的优化设计提供参考。

A numerical study on external flow around 200 kW horizontal axis wind turbine is presented using ANSYS Workbench software. Pressure distribution of blade surface and velocity distribution of rotation region are calculated. In addition, the total pressure, turbulence kinetic energy and eddy viscosity distribution on several different sections inX direction are analyzed, respectively, and the variation rules for the three above physical quantities of wind turbine are further obtained. The calculation results of external flow around wind turbine are applied to the numerical simulation of fluid-structure coupling of wind turbine blades and tower, according to that, the laws of the stress and strain distribu- tions on the blade and bracket of the wind generator are concluded. After vibration modal analysis, its first ten order vibration frequencies and mode shape are achieved ,which provides reference for the safe operation of wind turbine and mechanical optimal design for the blade.