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The University of Southampton
Engineering

Radiation from intake ducts

Multi-mode sound radiation from ducts with uniform flow has been examined. In the high-frequency limit, a simple analytic solution has been derived to predict the far-field directivity. Results have been derived for different source models including an equal power per mode distribution.

Results have been compared with numerical solutions calculated using the Wiener-Hopf technique for an unflanged duct, and the Rayleigh integral for a flanged duct.

Comparison between analytical and numerical predictions of far-field multi-mode directivity of sound radiated from a circular duct

 

Related publications:

Joseph, P.F., McAlpine, A. and Sinayoko, S. High frequency multimode radiation from ducts with flow. Proceedings of the 14th AIAA/CEAS Aeroacoustics Conference (29th AIAA Aeroacoustics Conference), Vancouver, Canada, 5-7 May 2008, AIAA-2008-2831, 2008.

Gabard, G. and Astley, R.J. Theoretical model for sound radiation from annular jet pipes: Far- and near-field solutions. Journal of Fluid Mechanics, 549, 2006, 315-41.

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