Modelling the nonlinear sound propagation and radiation of supersonic fan tones
Modelling the nonlinear sound propagation and radiation of supersonic fan tones
A numerical model of the nonlinear propagation of the rotor-locked pressure field inside a turbofan intake duct and the resultant sound field of supersonic fan tones is presented in this paper. Calculation of the non-linear propagation of the supersonic fan tones is carried out using the modified weak-shock theory implemented numerically by a combined time-frquency domain algorithm. Then the engine order frequency spectrum is calculated and compared against measured data acquired from a model-scale fan test. New methods to calculate a suitable starting pressure field from measured data as input to the model is also presented. Therefore, the work presented focusses on the generation of a source pressure field and the nonlinear propagation of the pressure field in rigid and lined wall intake ducts.
2945
Adetifa, O.E.
1cd33496-2a0b-47af-93ca-d4407b8a63c0
McAlpine, A.
aaf9e771-153d-4100-9e84-de4b14466ed7
Gabard, G.
bfd82aee-20f2-4e2c-ad92-087dc8ff6ce7
June 2014
Adetifa, O.E.
1cd33496-2a0b-47af-93ca-d4407b8a63c0
McAlpine, A.
aaf9e771-153d-4100-9e84-de4b14466ed7
Gabard, G.
bfd82aee-20f2-4e2c-ad92-087dc8ff6ce7
Adetifa, O.E., McAlpine, A. and Gabard, G.
(2014)
Modelling the nonlinear sound propagation and radiation of supersonic fan tones.
20th AIAA/CEAS Aeoracoustics Conference, Atlanta, United States.
16 - 20 Jun 2014.
.
(doi:10.2514/6.2014-2945).
Record type:
Conference or Workshop Item
(Paper)
Abstract
A numerical model of the nonlinear propagation of the rotor-locked pressure field inside a turbofan intake duct and the resultant sound field of supersonic fan tones is presented in this paper. Calculation of the non-linear propagation of the supersonic fan tones is carried out using the modified weak-shock theory implemented numerically by a combined time-frquency domain algorithm. Then the engine order frequency spectrum is calculated and compared against measured data acquired from a model-scale fan test. New methods to calculate a suitable starting pressure field from measured data as input to the model is also presented. Therefore, the work presented focusses on the generation of a source pressure field and the nonlinear propagation of the pressure field in rigid and lined wall intake ducts.
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Published date: June 2014
Venue - Dates:
20th AIAA/CEAS Aeoracoustics Conference, Atlanta, United States, 2014-06-16 - 2014-06-20
Organisations:
Acoustics Group
Identifiers
Local EPrints ID: 388640
URI: http://eprints.soton.ac.uk/id/eprint/388640
PURE UUID: 18066864-2cc7-4d40-83c2-74de18587497
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Date deposited: 02 Mar 2016 15:25
Last modified: 15 Mar 2024 03:00
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Contributors
Author:
O.E. Adetifa
Author:
G. Gabard
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