An experimental investigation into the influence of installed chevron jet flows on wall-pressure fluctuations
An experimental investigation into the influence of installed chevron jet flows on wall-pressure fluctuations
Jet-surface interaction represents a significant community noise problem for the installation of modern ultra-high bypass ratio turbofan engines. The use of chevron nozzles is known to reduce low-frequency jet mixing noise by increasing the mixing rate close to the nozzle. It is currently unknown, however, to what extent such a nozzle lip treatment affects the Kelvin-Helmholtz instability, generated in the vicinity of the wing, which will modify the source of jet-surface interaction noise. To clarify the physics of the jet-surface interaction noise source, an extensive experimental investigation was conducted using the Flight Jet Rig in the anechoic chamber of the Doak Laboratory, at the University of Southampton. Various measurements were carried out on a round and a chevron single stream, unheated subsonic jet, both in an isolated configuration and installed beneath a 2DNACA4415 airfoil "wing". The wall-pressure field on the wing surface was investigated using a pair of miniature wall-pressure transducers and a set of ultra-thin precision microphones. These sensors were flush-mounted in both the stream-wise and span-wise directions on the pressure side of the wing and the unsteady wall-pressure data were analysed in the time and frequency domains. The far-field noise results show significant broadband noise reduction by the chevron jet. This is further evidenced by a reduction in the span-wise correlation length along the wing trailing edge over a wide range of frequencies. Significant reduction of the tonal trapped wave energy is also observed.
Carbini, Edoardo
89272523-3c4f-443c-9f5a-877d454a8e13
Meloni, Stefano
9c310e86-4f90-4f61-a649-0b11763f0674
Camussi, Roberto
0da46d12-0aa9-4c11-9e06-a22ff80e79dc
Lawrence, Jack
59a5a96a-8824-4bae-a22a-739ad4ce9144
Ramos Proenca, Anderson
575c4921-cf19-4301-bc7a-70a4432ea0df
24 August 2022
Carbini, Edoardo
89272523-3c4f-443c-9f5a-877d454a8e13
Meloni, Stefano
9c310e86-4f90-4f61-a649-0b11763f0674
Camussi, Roberto
0da46d12-0aa9-4c11-9e06-a22ff80e79dc
Lawrence, Jack
59a5a96a-8824-4bae-a22a-739ad4ce9144
Ramos Proenca, Anderson
575c4921-cf19-4301-bc7a-70a4432ea0df
Carbini, Edoardo, Meloni, Stefano, Camussi, Roberto, Lawrence, Jack and Ramos Proenca, Anderson
(2022)
An experimental investigation into the influence of installed chevron jet flows on wall-pressure fluctuations.
In internoise2022.org.
Institute of Acoustics..
Record type:
Conference or Workshop Item
(Paper)
Abstract
Jet-surface interaction represents a significant community noise problem for the installation of modern ultra-high bypass ratio turbofan engines. The use of chevron nozzles is known to reduce low-frequency jet mixing noise by increasing the mixing rate close to the nozzle. It is currently unknown, however, to what extent such a nozzle lip treatment affects the Kelvin-Helmholtz instability, generated in the vicinity of the wing, which will modify the source of jet-surface interaction noise. To clarify the physics of the jet-surface interaction noise source, an extensive experimental investigation was conducted using the Flight Jet Rig in the anechoic chamber of the Doak Laboratory, at the University of Southampton. Various measurements were carried out on a round and a chevron single stream, unheated subsonic jet, both in an isolated configuration and installed beneath a 2DNACA4415 airfoil "wing". The wall-pressure field on the wing surface was investigated using a pair of miniature wall-pressure transducers and a set of ultra-thin precision microphones. These sensors were flush-mounted in both the stream-wise and span-wise directions on the pressure side of the wing and the unsteady wall-pressure data were analysed in the time and frequency domains. The far-field noise results show significant broadband noise reduction by the chevron jet. This is further evidenced by a reduction in the span-wise correlation length along the wing trailing edge over a wide range of frequencies. Significant reduction of the tonal trapped wave energy is also observed.
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Published date: 24 August 2022
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© 2022 Internoise. All Rights Reserved.
Venue - Dates:
The 51st International Congress and Exposition on Noise Control Engineering: Internoise 2022, Scottish Event Campus (SEC), Glasgow, United Kingdom, 2022-08-21 - 2022-08-24
Identifiers
Local EPrints ID: 474230
URI: http://eprints.soton.ac.uk/id/eprint/474230
PURE UUID: b18660b9-502e-442b-9662-57c7099d7c37
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Date deposited: 16 Feb 2023 17:47
Last modified: 17 Mar 2024 00:54
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Contributors
Author:
Edoardo Carbini
Author:
Stefano Meloni
Author:
Roberto Camussi
Author:
Anderson Ramos Proenca
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