The University of Southampton
University of Southampton Institutional Repository

Bluff body noise control using perforated fairings

Bluff body noise control using perforated fairings
Bluff body noise control using perforated fairings
Landing gears of commercial aircraft make an important contribution to total aircraft noise in the approach
configuration. Using fairings to shield components from high-speed impingement reduces noise. Furthermore,
perforating these fairings has been confirmed by flight tests to enable a further reduction. A fundamental study has
been performed to investigate and optimize the benefits of bleeding air through the fairing by application of
perforations. Experiments have been performed with a simplified fairing–strut combination to clarify the influence
of perforations on flow behavior and acoustics. The fairing self-noise is reduced significantly by breakdown of the
vortex shedding process, resulting in a reduction of the associated broadband noise level. A redistribution of the
velocities is achieved depending on the applied porosity. However, increasing the porosity can result in adverse noise
effects due to the bled mass flow washing the strut. Self-noise of the perforations manifests itself at higher frequencies,
although scaling of this phenomenon with orifice diameter opens up the possibility to shift it above the upper limit of
the audible range.
0001-1452
33-43
Boorsma, K.
657936db-a1d2-4f78-9cfe-7d1f913c6d84
Zhang, X.
3056a795-80f7-4bbd-9c75-ecbc93085421
Molin, N.
0bed184f-f112-4182-b266-cd630c2ba109
Chow, L.C.
d0f85930-0d96-4ed5-98f3-9a04182e4274
Boorsma, K.
657936db-a1d2-4f78-9cfe-7d1f913c6d84
Zhang, X.
3056a795-80f7-4bbd-9c75-ecbc93085421
Molin, N.
0bed184f-f112-4182-b266-cd630c2ba109
Chow, L.C.
d0f85930-0d96-4ed5-98f3-9a04182e4274

Boorsma, K., Zhang, X., Molin, N. and Chow, L.C. (2009) Bluff body noise control using perforated fairings. AIAA Journal, 47 (1), 33-43. (doi:10.2514/1.32766).

Record type: Article

Abstract

Landing gears of commercial aircraft make an important contribution to total aircraft noise in the approach
configuration. Using fairings to shield components from high-speed impingement reduces noise. Furthermore,
perforating these fairings has been confirmed by flight tests to enable a further reduction. A fundamental study has
been performed to investigate and optimize the benefits of bleeding air through the fairing by application of
perforations. Experiments have been performed with a simplified fairing–strut combination to clarify the influence
of perforations on flow behavior and acoustics. The fairing self-noise is reduced significantly by breakdown of the
vortex shedding process, resulting in a reduction of the associated broadband noise level. A redistribution of the
velocities is achieved depending on the applied porosity. However, increasing the porosity can result in adverse noise
effects due to the bled mass flow washing the strut. Self-noise of the perforations manifests itself at higher frequencies,
although scaling of this phenomenon with orifice diameter opens up the possibility to shift it above the upper limit of
the audible range.

Full text not available from this repository.

More information

Published date: January 2009
Organisations: Aerodynamics & Flight Mechanics

Identifiers

Local EPrints ID: 148529
URI: https://eprints.soton.ac.uk/id/eprint/148529
ISSN: 0001-1452
PURE UUID: f8cc9c5a-1eb8-4e29-9909-530078c1447b

Catalogue record

Date deposited: 28 Apr 2010 11:00
Last modified: 17 Jul 2019 00:03

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 https://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.

×