Sound radiation from a bypass duct with bifurcations

Chen, X.X., Huang, X. and Zhang, X. (2009) Sound radiation from a bypass duct with bifurcations. AIAA Journal, 47 (2), 429-436. (doi:10.2514/1.39710).

Abstract

The influence of bifurcations in an aeroengine bypass duct on noise radiation was investigated through high-orderaccurate
three-dimensional numerical simulations. The physical process was described by a set of acoustic
perturbation equations. Four bifurcation arrangements with an airfoil cross section were regularly placed in
circumferential direction. Results were compared with those of an axisymmetric duct case without the installation of
bifurcations. Both near-field propagation and far-field radiation were studied to show that the bifurcations scatter
acoustic modes and redirect sound propagation levels. Compared to the axisymmetric duct case, there are a couple of
decibel increases in sound pressure level on some angles due to the installation of bifurcations. The method is also
applicable to other configurations with different bifurcations and modes

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