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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。
Based on the vortex method and the experimental conditions, the inlet boundary conditions are modified, and the three-dimensional unsteady numerical simulation of a S-airfoil horizontal axis wind turbine is carried out based on the delay separation vortex turbulence model and the K-FWH equation. The influences of turbulence inflow on the pulsating pressure, Acoustic spectrum and sound radiation propagation, and the corresponding numerical simulation results with the experimental data were analyzed. The results show that the amplitude of each peak pressure fluctuates with different inflows and the new peak of high frequency broadband noise appears in the radiated sound. The total sound pressure level is the largest at 0.57R in the radial direction of the blade. With the axial distance increasing, Sound pressure level decreased, and the fastest decline in the axial distance is less than 500 mm, close to the tip position of the test line sound pressure level and experimental consistent jump phenomenon.