Amiet剪切层理论的角度折射验证研究

Verification of angle refraction correction based on Amiet's shear layer theory

在开口射流风洞中进行气动噪声的定位测量试验时,射流边界的剪切层会对声传播产生折射影响。在处理过程中需要对传声器测量的信号进行剪切层修正,修正结果将直接影响到波束形成对气动噪声源定位的准确性。本文针对经典的Amiet剪切层修正理论,综合计算气动声学(Computational aeroacoustics,CAA)数值计算与试验测试,对该理论进行了验证,研究表明CAA计算与Amiet理论吻合,Amiet理论能够有效修正剪切层对声波的角度折射影响。

When aeroacoustic location measures in open jet wind tunnel,the shear layer at jet boundary can cause the sound refraction effect. The measured signals by microphones need to be corrected in the process.The correction results directly affect the accuracy of beamforming. According to Amiet＇s sheay layer theory,this paper validated the classic theory combining computational aeroacoustics（ CAA） with tests. The study shows that Amiet＇s theory agrees with the CAA calculation and it could effectively correct the angle of refraction effects on acoustic filed.