The University of Southampton
University of Southampton Institutional Repository

Assessment of a frequency-domain linearized Euler solver for turbofan aft radiation predictions with comparison measurements

Assessment of a frequency-domain linearized Euler solver for turbofan aft radiation predictions with comparison measurements
Assessment of a frequency-domain linearized Euler solver for turbofan aft radiation predictions with comparison measurements
This paper presents a frequency-domain computational aeroacoustics tool for predicting aft noise radiation through turbofan ducts and jets and its application to two realistic engine exhaust configurations which have been experimentally tested. The tool is based on the discretised axisymmetric form of the linearised Euler equations in conjunction with perfectly matched layer equations at the inlet and far-field boundaries using high-order finite differences. The resultant linear system of equations is inverted by the state-of-the-art parallel sparse solver MUMPS. The far-field prediction is carried out by integrating Kirchhoff’s formula in frequency domain. The code has already been verified extensively for idealized semi-infinite duct cases with comparisons to available analytical solutions with very good agreement. Therefore, we concentrate in this paper on numerical solutions to the experimental cases tested in the EC FP6 Project TURNEX (TUrbomachinery noise Radiated through the engine EXhaust) to assess and partially validate the present solver further. Comparisons of the computed results with the measured data reveal that the solver predicts the general noise radiation patterns and sound levels reasonably well, so long as the target in-duct azimuthal mode remains dominant as it radiates to the far-field. The agreement strongly suggests that, at least for the range of mean flows and acoustic conditions considered, the physical aeroacoustic radiation processes are fully captured through the frequency-domain solutions to the linearised Euler equations.

computational aeroacoustics, linearized euler equations, frequency-domain, convective instabilities, exhaust radiation
153-162
Özyörük, Yusuf
10c12b5c-2aee-43c5-81aa-17da6bc6f3de
Tester, Brian J.
1bd4a793-131b-4173-93cc-3eca70b2d116
Özyörük, Yusuf
10c12b5c-2aee-43c5-81aa-17da6bc6f3de
Tester, Brian J.
1bd4a793-131b-4173-93cc-3eca70b2d116

Özyörük, Yusuf and Tester, Brian J. (2010) Assessment of a frequency-domain linearized Euler solver for turbofan aft radiation predictions with comparison measurements. [in special issue: IUTAM Symposium on Computational Aero-Acoustics for Aircraft Noise Prediction] Procedia Engineering, 6, 153-162. (doi:10.1016/j.proeng.2010.09.017).

Record type: Article

Abstract

This paper presents a frequency-domain computational aeroacoustics tool for predicting aft noise radiation through turbofan ducts and jets and its application to two realistic engine exhaust configurations which have been experimentally tested. The tool is based on the discretised axisymmetric form of the linearised Euler equations in conjunction with perfectly matched layer equations at the inlet and far-field boundaries using high-order finite differences. The resultant linear system of equations is inverted by the state-of-the-art parallel sparse solver MUMPS. The far-field prediction is carried out by integrating Kirchhoff’s formula in frequency domain. The code has already been verified extensively for idealized semi-infinite duct cases with comparisons to available analytical solutions with very good agreement. Therefore, we concentrate in this paper on numerical solutions to the experimental cases tested in the EC FP6 Project TURNEX (TUrbomachinery noise Radiated through the engine EXhaust) to assess and partially validate the present solver further. Comparisons of the computed results with the measured data reveal that the solver predicts the general noise radiation patterns and sound levels reasonably well, so long as the target in-duct azimuthal mode remains dominant as it radiates to the far-field. The agreement strongly suggests that, at least for the range of mean flows and acoustic conditions considered, the physical aeroacoustic radiation processes are fully captured through the frequency-domain solutions to the linearised Euler equations.

This record has no associated files available for download.

More information

Published date: March 2010
Venue - Dates: IUTAM Symposium on Computational Aero-Acoustics for Aircraft Noise Prediction, Southampton, United Kingdom, 2010-03-29 - 2010-03-31
Keywords: computational aeroacoustics, linearized euler equations, frequency-domain, convective instabilities, exhaust radiation

Identifiers

Local EPrints ID: 172997
URI: http://eprints.soton.ac.uk/id/eprint/172997
PURE UUID: 6ce005f6-e99e-4ea5-96b9-b0ec80f9a4a4

Catalogue record

Date deposited: 01 Feb 2011 11:54
Last modified: 14 Mar 2024 02:30

Export record

Altmetrics

Contributors

Author: Yusuf Özyörük
Author: Brian J. Tester

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.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

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.

×