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Nonlinear propagation of supersonic fan tones in turbofan intake ducts

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.
0001-1452
Adetifa, Oluwaseun
1cd33496-2a0b-47af-93ca-d4407b8a63c0
Mcalpine, Alan
aaf9e771-153d-4100-9e84-de4b14466ed7
Gabard, Gwenael
bfd82aee-20f2-4e2c-ad92-087dc8ff6ce7
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 (2017) Nonlinear propagation of supersonic fan tones in turbofan intake ducts AIAA Journal

Record type: Article

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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More information

Accepted/In Press date: 15 June 2017

Identifiers

Local EPrints ID: 412817
URI: http://eprints.soton.ac.uk/id/eprint/412817
ISSN: 0001-1452
PURE UUID: dc56cef5-9141-41ad-a9a7-86e2daf56fbc
ORCID for Alan Mcalpine: ORCID iD orcid.org/0000-0003-4189-2167

Catalogue record

Date deposited: 02 Aug 2017 16:30
Last modified: 02 Aug 2017 16:30

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Contributors

Author: Oluwaseun Adetifa
Author: Alan Mcalpine ORCID iD
Author: Gwenael Gabard

University divisions

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