基于简化射线模型的剪切层相位修正方法

给出了基于简化射线模型的三维有限厚度风洞剪切层相位修正方法,利用数值模拟结果对该方法的物理依据进行了解释,并将其与传统的Amiet方法和平均马赫数法进行了对比研究,通过风洞试验对简化射线法的有效性进行了验证,最后给出了简化射线法对空间弯曲的剪切层的相位修正方法。结果表明:在来流马赫数小于等于0.3、测量角在40°~140°的范围内,当声源和传声器在同一个平面内时,对于风洞剪切层引起声波相位畸变修正,简化射线法、平均马赫数法和Amiet方法之间没有明显的差别,三种方法之间的相对误差小于1%。 

A shear layer phase shift correction method based on simplified ray model

A shear layer phase shift correction method for three-dimensional finite thickness wind tunnel based on simplified ray model was presented. And its physical basis was explained with the help of numerical simulation. A comparison of the simplified ray model with Amiets method and average Mach number method was given. The presented simplified shear layer correction method was validated experimentally using a microphone array to localize an inflow source. Lastly, the curved shear layer phase shift correction method using the simplified ray method was given. It was found that if inflow Mach number was less than and equal to 0.3 and measurement angle ranged from 40° to 140°, when the source and mircophones were on the same plane, the difference between the three correction methods was less than 1%.