共振吸声结构在航空发动机上的应用进展

共振吸声结构是由穿孔面板、蜂窝及刚性背板形成的三明治夹层结构,该结构广泛应用于发动机消声短舱内,取得了良好的降噪效果。随着声学理论及制造工艺的不断进步,共振吸声结构从最初的单自由度逐步发展为多自由度甚至内嵌多自由度阶段,吸声效果也取得了较大进步。详细阐述共振吸声结构的吸声原理,并在此基础上介绍国内外发动机消声短舱的发展历程。指出发动机消声短舱的两个发展趋势及在进行短舱声衬结构的精细化设计时要考虑的细节问题,例如背景剪切流动、入射声压级、制造误差等。

Resonance absorbing structure and its application in aero engines

Resonance sound absorption structure is a sandwich structure composed of perforated panel, honeycomb and rigid backplane. This structure is widely used in aircraft engine nacelle and has achieved good noise reduction effect. With the development of acoustic theory and manufacturing technology, the resonant sound absorption structure has gradually developed from the initial single-degree-of-freedom to multi-degree-of-freedom or even embedded multi-degree-of-freedom stage, and the sound absorption effect has also made great progress. In this paper, the sound absorption principle of resonance sound absorption structure is elaborated in detail first, and on this basis, the development about liners of aircraft engine nacelle at home and abroad is introduced. Two development trends of liners are pointed out: seamless liner and multi-degree-of-freedom liner. The latest research progress on multi-degree-of-freedom liner in China is briefly introduced also.