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The University of Southampton

Sound transmission in ducted shear flows

Ongoing research into sound transmission in lined ducts containing sheared mean flow aims to investigate how a boundary layer affects sound attenuation. Of particular interest is how high frequency sound is refracted by a shear flow. The sound can be refracted towards or away from the duct wall, thus increasing or decreasing the absorption of acoustic energy by the lining.

Some examples are shown below using the mode matching technique.

Simulation of pressure field in a bypass duct: (a) Outer and inner wall lined, (b) Outer wall lined only, (c) Inner wall lined only.


Related publications:/p>

Brooks, C.J. Sound propagation in turbofan engine bypass ducts. EngD thesis, University of Southampton, 2007 .

Brooks, C. and McAlpine, A. Sound transmission in ducts with sheared mean flow. 13th AIAA/CEAS Aeroacoustics Conference, Rome, Italy, AIAA-2007-3545, 21-23 May 2007.

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