有限厚度变截面管道噪声的数值研究  

Numerical simulation of the ducted-fan noise with finite thickness

作　　者：王同庆[1] 张莉爽[1] 杨兵[2] 

机构地区：[1]北京航空航天大学能源与动力工程学院,北京100191 [2]中国科学院工程热物理研究所,北京100190

出　　处：《航空动力学报》2012年第4期721-725,共5页Journal of Aerospace Power

摘　　要：为了研究航空发动机消声短舱声传播的物理机制,采用快速声散射方法计算管道风扇远场散射问题,使用该方法不但可计算变截面管道风扇的噪声,还可计算有限厚度对声散射的影响.通过数值模拟分析了两种不同简化管道形状(等截面圆管、变截面圆管)中管道厚度对散射声场的影响,当管道厚度超过半径的2%时,管道厚度对散射声场的影响不能忽略,研究成果为声学预测中管道厚度的选择提供了参考依据.To analyze the acoustic propagation of aircraft engine nacelle,predicting the acoustic propagation of a varying cross-section ducted-fan with finite thickness,the fast scattering method was discussed.The ability of the method in application to the sound propagation problems with different pipeline thickness of ducted-fan shapes,including the equal circular tube and variable cross-section tube has been demonstrated.If the pipeline thickness is more than 2 percents of the radius,the pipeline thickness should not be ignored in the prediction of the scattering sound field.The present method provides the theory basis for choosing the ducted-fan thickness in the engineering.

关 键 词：发动机短舱 管道厚度 散射声场 快速声散射方法 直接边界元方法 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]