An experimental investigation into the influence of installed chevron jet flows on wall-pressure fluctuations

Simple item page
dc.contributor.authorCarbini, Eduardo
dc.contributor.authorMeloni, Stefano
dc.contributor.authorCamussi, Roberto
dc.contributor.authorLawrence, Jack
dc.contributor.authorProença, Anderson
dc.date.accessioned2023-06-26T12:52:58Z
dc.date.available2023-06-26T12:52:58Z
dc.date.issued2022-08-24
dc.description.abstractJet-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 2D NACA4415 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.en_UK
dc.identifier.citationCarbini E, Meloni S, Camussi R, et al., (2022) An experimental investigation into the influence of installed chevron jet flows on wall-pressure fluctuations. In: Inter-noise 2022, 21-24 August 2022, Glasgow, Scotland, UKen_UK
dc.identifier.isbn978-1-906913-42-7
dc.identifier.urihttps://az659834.vo.msecnd.net/eventsairwesteuprod/production-inconference-public/612a763bb5894895acce1f80413d98e8
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/19890
dc.language.isoenen_UK
dc.publisherInterNoiseen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.titleAn experimental investigation into the influence of installed chevron jet flows on wall-pressure fluctuationsen_UK
dc.typeConference paperen_UK

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
influence_of_installed_chevron_jet_flows-2023.pdf
Size:
13.45 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Staff publications (SATM)