后掠叶栅发声机理的研究

NOISE GENERATION BY SWEPT CASCADE

本文研究了后掠叶栅的发声机理,并给出了相应的声压、声功率的计算公式。文中还讨论了转子尾流与后掠静子相互作用的干涉噪声随后掠角的变化规律,结果表明合理地选择后掠角将对干涉噪声的大小产生重要的影响。

A theoretical model for analysing the aeroacoustic nature of swej t cascade is described.Some closed form expressions for the acoustic pressure and acoustic power in far field are obtained.These expressions are used in parametric,calculations of rotor viscous wake-stator vane interaction in order to study the effectiveness of sweep as a noise reduc-tion mechanism.It is concluded that the swept angle play an important role in the generation of noise of cascade,in some cases,however,the swept angle does not result in the reduction of noise generated by the interaction of rotor viscous wake-stator vane.