The University of Southampton
University of Southampton Institutional Repository

Sound radiation from a generic bypass duct with bifurcations

Chen, X., Huang, X. and Zhang, X. (2008) Sound radiation from a generic bypass duct with bifurcations At 14th AIAA/CEAS Aeroacoustics Conference. 05 - 07 May 2008. 15 pp.

Record type: Conference or Workshop Item (Paper)


The influence of bifurcations in an aero-engine bypass duct on noise radiation was investigated through high-order accurate three-dimensional numerical simulations. The physical process was described by a set of acoustic perturbation equations (APE), with a background mean flow. Four bifurcation arrangements, with an airfoil cross-section, were regularly placed in circumferential direction. Results of the simulations were compared with those of a clean duct case. A circumferential mode of m=12 with radial mode of n=1 and multi-n modes at a source frequency of 1547 Hz were set as acoustic inputs. Acoustic modes interfered with the bifurcations resulting in a doubled circumferential mode pattern in the near field acoustic pressure distribution and slightly stronger sound pressure level behind the bifurcations. Far field noise computations indicated 3.2 dB and 2.0 dB sound pressure level increases for radial mode of n=1 and multi-n modes respectively. The bifurcations did not alter the radiation angle. A comparison was also made between APE and linearlised Euler equations (LEE). Results showed that the APE simulation produced almost identical far field sound prediction to the LEE, with a small difference (< 0.8dB) at the main radiation peak angle.

PDF AIAA_2008_2877_chen.pdf - Version of Record
Download (999kB)

More information

Published date: 5 May 2008
Venue - Dates: 14th AIAA/CEAS Aeroacoustics Conference, 2008-05-05 - 2008-05-07
Organisations: Aerodynamics & Flight Mechanics


Local EPrints ID: 64087
PURE UUID: 0cacff42-157d-46f2-884e-67f0a47b66de

Catalogue record

Date deposited: 01 Dec 2008
Last modified: 17 Jul 2017 14:14

Export record

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.