本文研究了气动声学的一般性相似原理,为气动声学的模型实验研究方法建立理论基础。由此得到了四个关于气动声场相似的相似准则数,导出了适合于流动分析的相似条件。对非定常流动中所产生的脉动力谱进行的相似分析,证实当气动力学完全相似时,以Strouhal数作为无量纲频率参数的脉动力谱函数也完全相似,此时,在几何相似点上测得的声谱在以St数作为频率坐标的频谱图上完全相同。风扇噪声的试验证实了气动声学的相似律。 In this paper, we study the general similarity principle of aeroacoustics and establish the theoretical basis for the experimental research of aeroacoustics model. Thus, four similar criterion numbers for aerodynamic sound field are obtained, and the similar conditions suitable for flow analysis are derived. A similar analysis of the pulsating force spectra generated in unsteady flows confirms that when the aerodynamics are completely similar, the pulsatile force spectrum functions with Strouhal numbers as dimensionless frequency parameters are completely similar. In this case, The resulting sound spectrum is exactly the same on a spectrogram with St numbers as frequency coordinates. Fan noise tests confirm the similarity of aeroacoustics.