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本文通过分析回转体边界层转捩区声辐射的机理，就转捩区长度对回转体转捩区辐射声压谱的影响进行了讨论。结果表明：来流速度和回转体直径是影响回转体转捩区长度、也是影响回转体转换区辐射声压谱的主要因素；在来流速度和回转体直径相同时，则回转体外形对转板区长度的影响起主导作用。采用本文的方法所得的理论值与实测值之间的一致性较好。
In this paper, by analyzing the mechanism of acoustic radiation in the revolving body boundary layer transition zone, the influence of the transition zone length on the radiation sound pressure spectrum in revolving body transition zone is discussed. The results show that the flow velocity and the diameter of the rotating body are the main factors that affect the length of the rotating body transition zone and also affect the sound pressure spectrum of the rotating body transition zone. When the incoming velocity and the rotating body diameter are the same, The influence of board length plays a leading role. The consistency between the theoretical value and the measured value obtained by this method is better.