Abstract
Acoustic liners play a vital role in the reduction of aero-engine noise and combustion instabilities. In the present work, acoustic damping behavior of perforated cylindrical liners of mixed porosities is investigated both analytically and experimentally. The aim of the paper is to propose a generalized analytical model for the compliance of mixed porosity liners. The analytical results are obtained by considering the compliance of each segment of distinct porosities. Experimental results are compared with the analytical predictions to validate the proposed generalized compliance expression. Predicted results are in reasonable good agreement with the experimental results. A parametric study is carried out for different flow with variably segmented liner configurations. The effect of number of liner segments is studied. Liners with higher number of segments are shown to perform better than the liners having lesser number of segments.
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