Acoustic resonance in cavities in aero engines is a current and major concern due to the detrimental effect the unsteady loads have on the nearby components in the engine.A special interest within the current project is the acoustic interaction of the bleed system in the compressor which might lead to failure of upstream components in the low pressure compressor.Acoustic resonances, such as Helmholtz and organ pipe resonances, can occur for open cavities but with more complex cavity geometries the prediction of those intensifies as well. Rossiter described an interaction of the cavity acoustics with a boundary layer vortex frequency which can generate strong acoustic waves. In a jet engine these waves can lead to structural damages of susceptible components and pre-lifetime failure.This study focuses on a generic approach of a cavity with a fixed rectangular opening and variable depth. The results shall help identify a correlation between the chosen geometries and the Rossiter resonance for a variety of flow conditions. The setup will be tested experimentally in a transonic wind tunnel and the results compared to theoretical models. This in turn will help to provide validation data for the design of more complex cavities for future studies.

Experimental Investigation of Rossiter Modes for an Open Cavity With Adjustable Depth

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2021/volume/84898

Turbo Expo 2021

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