风力机旋转叶片脉动风场建模与数值仿真

Simulation study of stochastic fluctuating wind field for wind turbine blades

分析了风力机风场模型与普通建筑风场模型的相同点和不同点,指出叶片的转动将改变叶片上风速模拟点风速谱的能量分布,使相当部分的频率能量集中到风轮旋转频率及其倍频处。根据标准vonKarman模型和旋转采样谱模型,推导并建立了风力机叶片的脉动风速谱功率矩阵,并在此基础上,采用谐波叠加法模拟了叶片脉动风速模拟点的风速时序数据。

The differences of the wind field model between wind turbines and common architectures are investigated. It is indicated that substantial frequency contents are transferred to rotor rotation frequency and its harmonics due to the periodic motions of blade. According to standard von Karman power spectral density （PSD） model and rotationally sampled PSD model, the PSD matrix for turbulence on blades of wind turbine is setup. The longitudinal turbulence＇s time serials is simulated based on the superimposition of harmonic waves.