ANALYSIS MODEL OF C-DUCT SOUND PROPAGATION WITH CIRCUMFERENTIAL ACOUSTIC LINERS

The presence of bifurcation structures in the rear nacelle of aircraft engines poses significant challenges for acoustic calculations. The increased structural complexity has led to the current predominance of three-dimensional numerical methods, which require substantial computational resources for high-frequency analysis. To address these computational demands, our research develops an analytical C-duct model incorporating inner and outer circumferential acoustic liners based on the transfer element method. The model demonstrates excellent agreement with finite element results across various configurations while achieving computational efficiency improvements exceeding two orders of magnitude. This breakthrough enables rapid iterative design optimization and noise prediction for rear nacelle acoustic engineering.