Investigations on the Acoustic Resonance in Aeroengine Multi-Stage Compressor

Abstract

Acoustic resonance, which is caused by the coupling and interaction of flow and acoustic field in aeroengine, can not only produce noise with very high amplitude in compressor, but can also lead to the fatigue of the materials and endanger the structural integrity of aeroengine. Unlike the unsteady flow phenomenon such as surge, rotating stall, and rotation instability, researchers still cannot fully explain and understand acoustic resonance well, because there are only few investigations about acoustic resonance and the coupling between acoustic and flow field is quite complicated in the aeroengine. Thus, this study firstly summarizes the phenomenon of acoustic resonance, and systematically describes its characteristics. After that, some theoretical models and methods used for the prediction of the acoustic resonance is introduced. Finally, proper orthogonal decomposition method is firstly proposed and applied for the study of acoustic resonance. A full passage unsteady numerical simulation is demonstrated with this method.