Impedance modelling of acoustically treated circumferential grooves for over-tip-rotor fan noise suppression
Impedance modelling of acoustically treated circumferential grooves for over-tip-rotor fan noise suppression
Experimental investigation of Over-Tip-Rotor circumferential groove liners has shown potential for fan noise suppression in turbofan engines whilst providing minimal penalty in fan aerodynamic performance. The validation of Over-Tip-Rotor liner analytical prediction models against published experimental data requires the modelling of an equivalent impedance for such acoustic treatments. This paper describes the formulation of two analytical groove impedance models as semi-locally reacting liners, that is locally reacting in the axial direction and non-locally reacting in the azimuthal direction. The models are cross-verified by comparison with high-order FEM simulations, and applied to a simplified Over-Tip-Rotor configuration consisting of multiple grooves excited by a monopole point source located close to the grooved surface.
Over-tip-rotor, duct acoustics, fan noise, grooves, liners, modelling
277-293
Palleja Cabre, Sergi
b841a96c-05d1-4f08-a197-8693cb3a3f90
Tester, Brian
1bd4a793-131b-4173-93cc-3eca70b2d116
Astley, Jeremy
cb7fed9f-a96a-4b58-8939-6db1010f9893
Beriot, Hadrien
af5a12ac-8347-48b9-9e15-9319a59163a9
1 October 2020
Palleja Cabre, Sergi
b841a96c-05d1-4f08-a197-8693cb3a3f90
Tester, Brian
1bd4a793-131b-4173-93cc-3eca70b2d116
Astley, Jeremy
cb7fed9f-a96a-4b58-8939-6db1010f9893
Beriot, Hadrien
af5a12ac-8347-48b9-9e15-9319a59163a9
Palleja Cabre, Sergi, Tester, Brian, Astley, Jeremy and Beriot, Hadrien
(2020)
Impedance modelling of acoustically treated circumferential grooves for over-tip-rotor fan noise suppression.
International Journal of Aeroacoustics, 19 (6-8), .
(doi:10.1177/1475472X20954427).
Abstract
Experimental investigation of Over-Tip-Rotor circumferential groove liners has shown potential for fan noise suppression in turbofan engines whilst providing minimal penalty in fan aerodynamic performance. The validation of Over-Tip-Rotor liner analytical prediction models against published experimental data requires the modelling of an equivalent impedance for such acoustic treatments. This paper describes the formulation of two analytical groove impedance models as semi-locally reacting liners, that is locally reacting in the axial direction and non-locally reacting in the azimuthal direction. The models are cross-verified by comparison with high-order FEM simulations, and applied to a simplified Over-Tip-Rotor configuration consisting of multiple grooves excited by a monopole point source located close to the grooved surface.
Text
IJA_GrooveModel_preprint
- Accepted Manuscript
Text
1475472x20954427
- Version of Record
More information
Accepted/In Press date: 13 June 2020
e-pub ahead of print date: 29 September 2020
Published date: 1 October 2020
Keywords:
Over-tip-rotor, duct acoustics, fan noise, grooves, liners, modelling
Identifiers
Local EPrints ID: 444903
URI: http://eprints.soton.ac.uk/id/eprint/444903
ISSN: 1475-472X
PURE UUID: 719d7a12-5203-4f2a-a104-85bd1a19771a
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Date deposited: 11 Nov 2020 17:30
Last modified: 17 Mar 2024 03:48
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Contributors
Author:
Brian Tester
Author:
Hadrien Beriot
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