大气湍流度对风力机翼型气动噪声的影响

摘要

With the increase of wind turbine scale, the aerodynamic noise of wind turbine blades becomes more serious. The stochastic characters of the incoming wind have large influence on the aerodynamic noise of the blades. In this paper, the stochastic numerical simulation of NACA 0012 airfoil was performed using BPM acoustic model and Monte Carlo method. The influence of the atmospheric turbulence intensity on airfoil aerodynamic noise was investigated quantitatively. The simulation results show that the atmospheric turbulence intensity has larger influence on high frequency noise than that on low frequency noise. With the increase of the atmospheric turbulence intensity, the variation of the sound pressure level also increases.%随着风力机大型化，风力机叶片气动噪声的影响日益突出。来流风况的随机性对于风力机叶片气动噪声的模拟具有一定影响。采用蒙特卡洛方法，结合BPM翼型自噪声模型，以NACA 0012翼型为研究对象进行不确定性数值模拟，量化大气湍流度对翼型自身噪声特性的影响。研究结果表明，大气湍流度对高频噪声的影响明显高于低频噪声。当大气湍流度增加时，声压级标准差也逐渐增大。