Nonlinear propagation of supersonic fan tones in turbofan intake ducts
Nonlinear propagation of supersonic fan tones in turbofan intake ducts
Supersonic fan tones are a critical issue for large fans; it is well known that these tones are a key noise source at high power operating conditions for modern turbofan aero-engines. Nonlinear propagation of the rotor-locked pressure field generated in a turbofan intake duct is calculated by implementing nonlinear weak-shock theory numerically via a combined time-frequency domain algorithm. The aim of the prediction method is to model the nonlinear attenuation and liner absorption of the rotor-locked pressure field within the intake duct. In this hybrid method, the time-domain approach provides a robust and accurate prediction of the non-linear attenuation while the frequency domain is required to represent the liner attenuation. The focus of this work is to compare the time-frequency domain method with time-domain or frequency-domain methods which have been developed previously to calculate the nonlinear propagation of the rotor-locked pressure field in either a rigid or lined intake duct respectively.
The capability of the time-frequency domain method to calculate accurately the nonlinear propagation of the rotor-locked pressure field, which can provide an engineering method for buzz-saw noise prediction, is demonstrated.
316-328
Adetifa, Oluwaseun
1cd33496-2a0b-47af-93ca-d4407b8a63c0
McAlpine, Alan
aaf9e771-153d-4100-9e84-de4b14466ed7
Gabard, Gwenael
bfd82aee-20f2-4e2c-ad92-087dc8ff6ce7
January 2018
Adetifa, Oluwaseun
1cd33496-2a0b-47af-93ca-d4407b8a63c0
McAlpine, Alan
aaf9e771-153d-4100-9e84-de4b14466ed7
Gabard, Gwenael
bfd82aee-20f2-4e2c-ad92-087dc8ff6ce7
Adetifa, Oluwaseun, McAlpine, Alan and Gabard, Gwenael
(2018)
Nonlinear propagation of supersonic fan tones in turbofan intake ducts.
AIAA Journal, 56 (1), .
(doi:10.2514/1.J056121).
Abstract
Supersonic fan tones are a critical issue for large fans; it is well known that these tones are a key noise source at high power operating conditions for modern turbofan aero-engines. Nonlinear propagation of the rotor-locked pressure field generated in a turbofan intake duct is calculated by implementing nonlinear weak-shock theory numerically via a combined time-frequency domain algorithm. The aim of the prediction method is to model the nonlinear attenuation and liner absorption of the rotor-locked pressure field within the intake duct. In this hybrid method, the time-domain approach provides a robust and accurate prediction of the non-linear attenuation while the frequency domain is required to represent the liner attenuation. The focus of this work is to compare the time-frequency domain method with time-domain or frequency-domain methods which have been developed previously to calculate the nonlinear propagation of the rotor-locked pressure field in either a rigid or lined intake duct respectively.
The capability of the time-frequency domain method to calculate accurately the nonlinear propagation of the rotor-locked pressure field, which can provide an engineering method for buzz-saw noise prediction, is demonstrated.
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AIAA_2017-03-J056121_revised
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Accepted/In Press date: 15 June 2017
e-pub ahead of print date: 31 July 2017
Published date: January 2018
Identifiers
Local EPrints ID: 412817
URI: http://eprints.soton.ac.uk/id/eprint/412817
ISSN: 0001-1452
PURE UUID: dc56cef5-9141-41ad-a9a7-86e2daf56fbc
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Date deposited: 02 Aug 2017 16:30
Last modified: 16 Mar 2024 03:02
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Author:
Oluwaseun Adetifa
Author:
Gwenael Gabard
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