扰动入流对风力机声辐射影响研究

EFFECT OF DISTURBANCE FLOW ON SOUND RADIATION OF WIND TURBINE

基于漩涡法和实验条件修正入口边界条件,结合延迟分离涡湍流模型和K-FWH方程对某S翼型水平轴风力机进行三维非定常数值模拟,对比分析扰动入流对风轮表面脉动压力、辐射声频谱和声辐射传播的影响,并将相应数值模拟结果与实验数据进行对比分析。结果表明:扰动入流下,叶片表面各峰值脉动压力幅值不同,辐射声中高频宽带噪声出现新的峰值;总声压级在叶片径向0.57R处最大,随轴向距离的增大,总声压级下降,且在轴向距离小于500 mm时下降最快,接近叶尖位置测试线声压级出现和实验一致的跳变现象。

Three dimension unsteady numerical simulation of certain S airfoil horizontal axis wind turbine was carried out using delayed separation vortex turbulence model and K-FWH noise equation and using the vortex method and experimental conditions to amend inlet boundary conditions. The effect of the disturbance inflow on pressure of wind wheel surface, sound radiation spectrum and sound radiation propagation were analyzed, and the relevant numerical simulation results were compared with experimental data. The results show that due to disturbance of the vortex caused by different amplitude of the peak pressure fluctuation on blade surface, the new peak of sound radiation in high frequency broadband noise appears. The total sound pressure level is the largest in the radial blade 0.57R. With increase of the axial distance, the total sound pressure level decrease, and it falls the fastest when the axial distance less than 500 mm. The jump phenomenon consistent with experiment when sound pressure level of the test line close to the blade tip appears.