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Modelling of flow effects on propagation and radiation from bypass ducts

Modelling of flow effects on propagation and radiation from bypass ducts
Modelling of flow effects on propagation and radiation from bypass ducts
A hybrid numerical procedure is presented for predicting the propagation and radiation of fan noise from an aero-engine bypass duct in the presence of mean flow and a bypass shear layer. The objective is to develop a relatively simple scheme which can predict the effects of bypass duct geometry and acoustic treatment on the radiated sound at modest computational cost. To achieve this, a relatively detailed in-duct numerical model, which captures the effects of the mean flow, liners and non-uniform geometry is coupled to an approximate radiation model which includes the effect of refraction through the bypass shear layer. Two different approaches are proposed for the radiation model. Results are presented which compare the predictions of each scheme for a generic, bypass duct with an impedance distribution characteristic of a modern high bypass ratio turbofan engine.
bypass duct, mean flow, refraction, prediction, finite element method
1-11
Sugimoto, R.
2e8b89ef-91d1-49e9-b739-929e06ce7ae4
Astley, R.J.
4b0af3c5-9fc5-4f66-ac24-3a109c92e929
Sugimoto, R.
2e8b89ef-91d1-49e9-b739-929e06ce7ae4
Astley, R.J.
4b0af3c5-9fc5-4f66-ac24-3a109c92e929

Sugimoto, R. and Astley, R.J. (2005) Modelling of flow effects on propagation and radiation from bypass ducts. 11th AIAA/CEAS Aeroacoustics Conference. 23 - 25 May 2005. pp. 1-11 .

Record type: Conference or Workshop Item (Paper)

Abstract

A hybrid numerical procedure is presented for predicting the propagation and radiation of fan noise from an aero-engine bypass duct in the presence of mean flow and a bypass shear layer. The objective is to develop a relatively simple scheme which can predict the effects of bypass duct geometry and acoustic treatment on the radiated sound at modest computational cost. To achieve this, a relatively detailed in-duct numerical model, which captures the effects of the mean flow, liners and non-uniform geometry is coupled to an approximate radiation model which includes the effect of refraction through the bypass shear layer. Two different approaches are proposed for the radiation model. Results are presented which compare the predictions of each scheme for a generic, bypass duct with an impedance distribution characteristic of a modern high bypass ratio turbofan engine.

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More information

Published date: 2005
Venue - Dates: 11th AIAA/CEAS Aeroacoustics Conference, 2005-05-23 - 2005-05-25
Keywords: bypass duct, mean flow, refraction, prediction, finite element method

Identifiers

Local EPrints ID: 28380
URI: https://eprints.soton.ac.uk/id/eprint/28380
PURE UUID: dc67414f-6e01-4a0d-b727-a129fe43d859

Catalogue record

Date deposited: 02 May 2006
Last modified: 17 Jul 2017 16:01

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