The University of Southampton
University of Southampton Institutional Repository

A theoretical model of fuselage pressure levels due to fan tones radiated from the intake of an installed turbofan aero-engine

A theoretical model of fuselage pressure levels due to fan tones radiated from the intake of an installed turbofan aero-engine
A theoretical model of fuselage pressure levels due to fan tones radiated from the intake of an installed turbofan aero-engine
An existing theoretical model to predict the pressure levels on an aircraft's fuselage is improved by incorporating a more physically realistic method to predict fan tone radiation from the intake of an installed turbofan aero-engine. Such a model can be used as part of a method to assess cabin noise. Fan tone radiation from a turbofan intake is modelled using the exact solution for the radiated pressure from a spinning mode exiting a semi-infinite cylindrical duct immersed in a uniform flow. This approach for a spinning duct mode incorporates scattering/diffraction by the intake lip, enabling predictions of the radiated pressure valid in both the forward and aft directions. The aircraft's fuselage is represented by an infinitely long, rigid cylinder. There is uniform flow aligned with the cylinder, except close to the cylinder's surface where there is a constant-thickness boundary layer. In addition to single mode calculations it is shown how the model may be used to rapidly calculate a multi-mode incoherent radiation from the engine intake. Illustrative results are presented which demonstrate the relative importance of boundary-layer shielding both upstream and downstream of the source, as well as examples of the fuselage pressure levels due to a multi-mode tonal source at high Helmholtz number.
0001-4966
3394-3405
Gaffney, James
7d1a9e19-a1cc-4066-8d98-e9e29c2a0177
Mcalpine, Alan
aaf9e771-153d-4100-9e84-de4b14466ed7
Kingan, Michael
2d2daafa-d6d7-41aa-a9fc-2307259ac9f0
Gaffney, James
7d1a9e19-a1cc-4066-8d98-e9e29c2a0177
Mcalpine, Alan
aaf9e771-153d-4100-9e84-de4b14466ed7
Kingan, Michael
2d2daafa-d6d7-41aa-a9fc-2307259ac9f0

Gaffney, James, Mcalpine, Alan and Kingan, Michael (2018) A theoretical model of fuselage pressure levels due to fan tones radiated from the intake of an installed turbofan aero-engine. Journal of the Acoustical Society of America, 143, 3394-3405. (doi:10.1121/1.5038263).

Record type: Article

Abstract

An existing theoretical model to predict the pressure levels on an aircraft's fuselage is improved by incorporating a more physically realistic method to predict fan tone radiation from the intake of an installed turbofan aero-engine. Such a model can be used as part of a method to assess cabin noise. Fan tone radiation from a turbofan intake is modelled using the exact solution for the radiated pressure from a spinning mode exiting a semi-infinite cylindrical duct immersed in a uniform flow. This approach for a spinning duct mode incorporates scattering/diffraction by the intake lip, enabling predictions of the radiated pressure valid in both the forward and aft directions. The aircraft's fuselage is represented by an infinitely long, rigid cylinder. There is uniform flow aligned with the cylinder, except close to the cylinder's surface where there is a constant-thickness boundary layer. In addition to single mode calculations it is shown how the model may be used to rapidly calculate a multi-mode incoherent radiation from the engine intake. Illustrative results are presented which demonstrate the relative importance of boundary-layer shielding both upstream and downstream of the source, as well as examples of the fuselage pressure levels due to a multi-mode tonal source at high Helmholtz number.

Text
JASA_Gaffneyetal_2018_peer-review_accepted_mauscript - Accepted Manuscript
Download (3MB)
Text
1.5038263 - Version of Record
Available under License Creative Commons Attribution.
Download (1MB)

More information

Accepted/In Press date: 2 May 2018
e-pub ahead of print date: 7 June 2018

Identifiers

Local EPrints ID: 421629
URI: http://eprints.soton.ac.uk/id/eprint/421629
ISSN: 0001-4966
PURE UUID: edbdad99-506b-4c4b-b2ec-c885627b9bc4
ORCID for Alan Mcalpine: ORCID iD orcid.org/0000-0003-4189-2167

Catalogue record

Date deposited: 18 Jun 2018 16:30
Last modified: 20 Jul 2019 04:15

Export record

Altmetrics

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.

×