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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.
In order to study the physical mechanism of anechoic cabin noise propagation in aeronautic engine, the fast acoustic scattering method is used to calculate the far-field scattering problem of the pipe fan. The method can not only calculate the noise of variable section pipe fan, but also calculate the influence of finite thickness on acoustic scattering The effects of pipe thickness on the sound field of two different simplified pipe shapes (circular pipe with constant cross section and variable cross section) were analyzed by numerical simulation. When the pipe thickness exceeds 2% of the radius, the influence of pipe thickness on the sound field can not be affected Ignored, the research results provide a reference for the choice of pipe thickness in acoustic prediction.