自由场气动声学相似理论与实验研究

气动声学相似理论为现代叶轮机械气动声学设计提供了分析手段，其相似律包括频率相似准则和源强度相似准则两大类，在叶轮机械中离散噪声和宽频噪声分别源于不同的机理，因而其相似性质也不一样，并且还证明Ｒｅ修正是必需的。实验结果证明了理论分析，二者结合构成了自由场气动声学相似研究的基本框架。

Theoretical and Experimental Research on Aeroacoustic Similarity in Free Space

Aeroacoustic similarity theory gives the analysis basis to aeroacoustic design of modern turbomachinery. It includes two aspects:frequency similarity rule and source strength similarity rule. Narrow band noise and broad band noise have different mechanisms, so their similarities are distinct from each other. The aeroacoustic modification induced by Re is proved to be necessary. The analyses are supported by experiments, and all these researches form the basic frame of aeroacoustic similarity theory in free space.