Experimental investigation into the suppression of propeller noise using over-tip-rotor liners
Experimental investigation into the suppression of propeller noise using over-tip-rotor liners
This paper presents an experimental study on suppressing propeller noise in a short duct configuration by installing Over-Tip-Rotor (OTR) liners on the wall casing. Far-field noise measurements are reported alongside in-duct pressure measurements at the wall obtained using an axial andazimuthal microphone array installed upstream of the propeller plane. In-duct measurements reveal that the OTR liner is effective in reducing broadband noise, achieving up to 4 dB of noise reduction over 1-5 BPFs. The axial decay of tonal components was compared with an analytical solution based on the Green’s function of an axialdipole source, requiring a large number of cut-off modes to match the experimental observations. The findings emphasise the importance of evanescent modes in compact duct acoustics, with direct implications for source modification, scattering effects, and far-field radiation.
Palleja Cabre, Sergi
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Ballgjati, Jona
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Paruchuri, Chaitanya
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Joseph, Phillip
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Avallone, Francesco
9bb6adef-cc50-498a-abca-497bca096a57
2025
Palleja Cabre, Sergi
b841a96c-05d1-4f08-a197-8693cb3a3f90
Ballgjati, Jona
64f225e3-84ae-42b6-9d7b-76dfaeb1bec0
Paruchuri, Chaitanya
5c1def64-6347-4be3-ac2d-b9f6a314b81d
Joseph, Phillip
9c30491e-8464-4c9a-8723-2abc62bdf75d
Avallone, Francesco
9bb6adef-cc50-498a-abca-497bca096a57
Palleja Cabre, Sergi, Ballgjati, Jona, Paruchuri, Chaitanya, Joseph, Phillip and Avallone, Francesco
(2025)
Experimental investigation into the suppression of propeller noise using over-tip-rotor liners.
Forum Acusticum Euronoise 2025, Malaga, Spain.
23 - 26 Jun 2025.
8 pp
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
This paper presents an experimental study on suppressing propeller noise in a short duct configuration by installing Over-Tip-Rotor (OTR) liners on the wall casing. Far-field noise measurements are reported alongside in-duct pressure measurements at the wall obtained using an axial andazimuthal microphone array installed upstream of the propeller plane. In-duct measurements reveal that the OTR liner is effective in reducing broadband noise, achieving up to 4 dB of noise reduction over 1-5 BPFs. The axial decay of tonal components was compared with an analytical solution based on the Green’s function of an axialdipole source, requiring a large number of cut-off modes to match the experimental observations. The findings emphasise the importance of evanescent modes in compact duct acoustics, with direct implications for source modification, scattering effects, and far-field radiation.
Text
ForumAcusticum2025_OTR_Liners_ducted_rotor
- Author's Original
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Published date: 2025
Venue - Dates:
Forum Acusticum Euronoise 2025, Malaga, Spain, 2025-06-23 - 2025-06-26
Identifiers
Local EPrints ID: 504967
URI: http://eprints.soton.ac.uk/id/eprint/504967
PURE UUID: 309027b1-9c31-4421-b460-aad0fa96d2b2
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Date deposited: 23 Sep 2025 16:46
Last modified: 24 Sep 2025 01:56
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Contributors
Author:
Jona Ballgjati
Author:
Francesco Avallone
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