波纹深度对波纹管气动噪声特性的影响

The influence of corrugation depth on aerodynamic noise characteristics of corrugated pipes

基于大涡模拟(large eddy simulation,LES)和FWH声比拟方法,仿真计算了波纹管气动噪声的三维模型,结果与理论值和实验测量相符合。对波纹深度进行了参数化计算分析,结果表明:①空气流过波纹管时,在波纹节点处绝对压力出现极大值,在波纹腹点处出现极小值;②随着轴向距离的增加,气动噪声的表面声压时均值增大;③随着波纹管波纹深度的增大,声压级和功率谱密度均值呈现先增大后减小的趋势。其数值计算方法对管道噪声处理有潜在应用价值。

Based on the method of LES(large eddy simulation)and FWH(Ffowcs Williams-Hawkings),the aerodynamic noise of corrugated tubes in 3D model was simulated and calculated,which was consistent with the theoretical value and experimental value.Comparing the results of parametric calculation and analysis of corrugated depth,the research results show that:①when the air flowing through corrugated tubes,the maximum of the absolute pressure appears at the corrugated pitch point and the minimum appears at the corrugated ventral point.②The average of surface sound pressure of aerodynamic noise increases as the axial distance increasing.③The sound pressure level and the mean power spectral density first increase and then decrease as the corrugated depth increasing.The numerical calculation method in this paper has potential application value in the field of duct noise processing.