转捩区长度对回转体流噪声的影响

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、也是影响回轨体转捩区辐射声压谱的主要因素，在来流攻回轨体直径相同时，则回转体形对转捩区长度的影响超主导作用，采用本文的方法所得的理论值与实验值之间的一致性较好。

Effect of length of the transition zone on the sound radiation from the boundary layer of an axisymmetric body

With the mechanism of acoustic radiation from the transition zone of an axisymmetric body analyzed, the effect of length of the transition zone on the sound pressure spectrum of the radiation of the transition zone is disscussed. It is shown that the fiow velocity and the diameter of an axisymmetric body are the main factors that infiuence the zone length and the sound pressure spectrum; and with the same flow ve locity and diameter, the head shape of an axisymmetric body has the decisive effect on the length of the transition zone. The calculated values are in agreement with the exper imental data.