Ferrous Fibre Network Materials for Jet Noise Reduction in Aeroengines. Part I: Acoustic Effects.


Golosnoy, I.O., Tan, J.C. and Clyne, T.W. (2008) Ferrous Fibre Network Materials for Jet Noise Reduction in Aeroengines. Part I: Acoustic Effects. Advanced Engineering Materials, 10, (3), 192-200.

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Description/Abstract

This paper describes an investigation into the acoustic effects of introducing tubular modules, made of highly porous ferrous materials, into the exhaust region of a small turbojet aeroengine. The modules are composed of sintered stainless steel fibre networks, with void contents in the approximate range of 80-95%. Some of the modules incorporated radial gradients of void content, produced by bonding together thin layers of different density. Measurements of acoustic intensity, as a function of frequency, have been made with various module geometries and locations, and data have also been acquired relating to engine thrust, engine speed and fuel consumption. It is shown that significant reductions in noise level (up to ~10 dB) can be achieved, at approximately constant thrust and fuel consumption, by the introduction of modules of this type. Such effects can arise both via modification to the gas flow field (and hence to noise generation characteristics) and by attenuation of acoustic waves within the modules. Reductions in noise creation will tend to be specific to the gas flow field within the engine concerned, but acoustic attenuation is expected to be a more general effect. In the second of this pair of papers, an investigation is presented into the thermo-mechanical stability of these fibre network materials in this environment.

Item Type: Article
ISSNs: 1438-1656
Related URLs:
Keywords: Fibre Network Material; Acoustic Damping; Noise Reduction; Sound Waves; Highly Porous Metallic Material
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > EEE
ePrint ID: 265343
Date Deposited: 28 Mar 2008 14:30
Last Modified: 27 Mar 2014 20:10
Publisher: WILEY-VCH Verlag GmbH & Co
Further Information:Google Scholar
ISI Citation Count:6
URI: http://eprints.soton.ac.uk/id/eprint/265343

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