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Acoustic liner optimisation and noise propagation through turbofan engine intake ducts

Acoustic liner optimisation and noise propagation through turbofan engine intake ducts
Acoustic liner optimisation and noise propagation through turbofan engine intake ducts
The research in this thesis explores the prediction of fan noise propagation through turbofan engine intakes and its radiation to the far-field. The performance of acoustic liners installed in intakes to attenuate noise is the focus of the study. A commercial CAA (Computational AeroAcoustics) code ACTRAN/TM and an in-house shell code ANPRORAD developed at the ISVR are used to predict the performance of acoustic liners throughout the studies presented in this thesis. An automated system for running computations for a large number of cases with different liner impedance and engine operating conditions has been developed and applied for optimising liners for maximum noise benefit. The intake liner configuration of main interest is an intake lip liner. The performance of liners are investigated for broadband and tone noise source components of fan noise. In the study for an intake lip liner, an optimum single layer was identified based on the optimisations. A series of no-flow scale rig tests were conducted in the anechoic chamber at the ISVR and the test data have been appraised by comparing with numerical predictions. Reasonable agreements have been achieved, and the lip liner showed measurable noise benefit. Numerical predictions of a lip liner performance have also been performed for a fan rig intake tested in the presence of flow.
Kewin, Matthew Fergus
7cc39535-fc9c-4271-9afa-499840378dca
Kewin, Matthew Fergus
7cc39535-fc9c-4271-9afa-499840378dca
Astley, Richard
cb7fed9f-a96a-4b58-8939-6db1010f9893

(2013) Acoustic liner optimisation and noise propagation through turbofan engine intake ducts. University of Southampton, Engineering and the Environment, Doctoral Thesis, 179pp.

Record type: Thesis (Doctoral)

Abstract

The research in this thesis explores the prediction of fan noise propagation through turbofan engine intakes and its radiation to the far-field. The performance of acoustic liners installed in intakes to attenuate noise is the focus of the study. A commercial CAA (Computational AeroAcoustics) code ACTRAN/TM and an in-house shell code ANPRORAD developed at the ISVR are used to predict the performance of acoustic liners throughout the studies presented in this thesis. An automated system for running computations for a large number of cases with different liner impedance and engine operating conditions has been developed and applied for optimising liners for maximum noise benefit. The intake liner configuration of main interest is an intake lip liner. The performance of liners are investigated for broadband and tone noise source components of fan noise. In the study for an intake lip liner, an optimum single layer was identified based on the optimisations. A series of no-flow scale rig tests were conducted in the anechoic chamber at the ISVR and the test data have been appraised by comparing with numerical predictions. Reasonable agreements have been achieved, and the lip liner showed measurable noise benefit. Numerical predictions of a lip liner performance have also been performed for a fan rig intake tested in the presence of flow.

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Published date: November 2013
Organisations: University of Southampton, Acoustics Group

Identifiers

Local EPrints ID: 366367
URI: http://eprints.soton.ac.uk/id/eprint/366367
PURE UUID: dab568ff-3741-4de8-97dc-deceea72a25c

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Date deposited: 26 Jun 2014 12:07
Last modified: 18 Jul 2017 02:14

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