摘要
基于Liepmann涡声理论，通过引入Lauchle的随机指示器函数，对考虑了声波沿回转体头部曲面传播的声绕射损失的回转体边界层转捩区辐射到头部驻点处的声功率谱进行了分析和估算。结果表明：转捩区的声辐射为单极子声辐射；转捩区的辐射声功率谱的谱峰将随着转捩区长度的减小而向高频迁移；同时，来流速度对其声辐射也有较大的影响．用此方法所得的理论值与实测值之间的一致性较好。
Based on the Liepmann's theory of vortex sound, the sound power spectrum from the boundary layer transition recieved at the stagnation point of an axisymmetric body is analyzed and predicted by introducing the Lauchle's random indicator fUnction, and the loss in sound energy due to accoustic diffraction of the waves around the nose contour is taken into account. It is shown that the transition zone creates monopole-type sound radiation; the peak spectral energy of transition zone is shifted to higher frequncies as the streamwise length of transition zone gets smaller; and the power is dependent on the velocity greatly. The calcutated values are in agreement with the experimental data very well.
出处
《声学学报》
EI
CSCD
北大核心
1999年第5期536-543,共8页
Acta Acustica
基金
中船总基金
