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Numerical studies of modal scattering within turbofan bypass ducts

Numerical studies of modal scattering within turbofan bypass ducts
Numerical studies of modal scattering within turbofan bypass ducts
The accurate prediction of the effects of geometry and acoustic treatment on noise propagation and attenuation within bypass ducts is critical for the acoustic design of modern turbofan aeroengines. A large number of propagating modes are generally present in such ducts, and complex acoustic interactions occur between the duct geometry and the liner placement. In this paper, a numerical study of these effects is presented. Finite element models are used to predict modal scattering for multimode sources and complex geometries. A shell program is used for efficient implementation. The mean flow field within the duct is calculated by an embedded compressible Euler flow solver prior to the acoustic analysis. A modal representation is used at each end of the computational domain to generate a modal power transmission matrix. A parametric study is performed in which the duct configuration is systematically varied to illustrate the effect of duct geometry and liner specification.
International Institute of Noise Control Engineering
Sugimoto, Rie
cb8c880d-0be0-4efe-9990-c79faa8804f0
Astley, R. Jeremy
cb7fed9f-a96a-4b58-8939-6db1010f9893
Sugimoto, Rie
cb8c880d-0be0-4efe-9990-c79faa8804f0
Astley, R. Jeremy
cb7fed9f-a96a-4b58-8939-6db1010f9893

Sugimoto, Rie and Astley, R. Jeremy (2006) Numerical studies of modal scattering within turbofan bypass ducts. In Proceedings of Inter-Noise 2006. International Institute of Noise Control Engineering..

Record type: Conference or Workshop Item (Paper)

Abstract

The accurate prediction of the effects of geometry and acoustic treatment on noise propagation and attenuation within bypass ducts is critical for the acoustic design of modern turbofan aeroengines. A large number of propagating modes are generally present in such ducts, and complex acoustic interactions occur between the duct geometry and the liner placement. In this paper, a numerical study of these effects is presented. Finite element models are used to predict modal scattering for multimode sources and complex geometries. A shell program is used for efficient implementation. The mean flow field within the duct is calculated by an embedded compressible Euler flow solver prior to the acoustic analysis. A modal representation is used at each end of the computational domain to generate a modal power transmission matrix. A parametric study is performed in which the duct configuration is systematically varied to illustrate the effect of duct geometry and liner specification.

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More information

Published date: 2006
Additional Information: CD-ROM
Venue - Dates: 35th International Congress and Exposition on Noise Control Engineering (Inter-Noise 2006), 2006-12-03 - 2006-12-06

Identifiers

Local EPrints ID: 43466
URI: https://eprints.soton.ac.uk/id/eprint/43466
PURE UUID: 5c1f4951-0042-4fb8-88e6-31021a3ab01f

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Date deposited: 14 Feb 2007
Last modified: 13 Mar 2019 21:09

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