Far-field pressure measurements of elliptic jets discharged close to a wing

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dc.contributor.authorRamos Proenca, Anderson
dc.contributor.authorLawrence, J. L. T.
dc.date.accessioned2022-02-17T11:52:04Z
dc.date.available2022-02-17T11:52:04Z
dc.date.issued2022-02-15
dc.description.abstractThis paper presents a preliminary experimental investigation into the acoustics of two elliptical jet nozzles installed close to a wing model. Acoustic pressure data is obtained for a range of observer polar angles mounted in the far field of the jets. Three nominal jet Mach numbers, namely 0.4, 0.6 and 0.8 are studied. Results suggest that the elliptic jets surveyed provide a noise reduction of the jet-surface installation noise source. The noise reduction is maximum in the forward arc and in the order of 1 dB for the fully-corrected overall sound pressure level data. Additionally, the noise benefit exists only when the minor axis of the elliptical nozzle is mounted parallel to the wing trailing edge. It is hypothesised that the reduction in the jet plume cross-section width limits the scattering of the near pressure field by the wing trailing edge to a lower frequency range. The jet mixing noise source, however, is seen to increase with decreasing nozzle exit-plane aspect ratio. The three jet velocities surveyed suggest the consistency of the key results discussed in the paper. Investigation of the jet turbulent flow structures and jet near pressure field is under way.en_UK
dc.description.sponsorshipEuropean Union funding: 769350en_UK
dc.identifier.citationProenca AR, Lawrence JLT. (2022) Far-field pressure measurements of elliptic jets discharged close to a wing. In: International Conference on Innovation in Aviation & Space to the Satisfaction of the European Citizens (11th EASN 2021), 1-3 September 2021, Virtual event.en_UK
dc.identifier.eissn1757-899X
dc.identifier.issn1757-8981
dc.identifier.issn1757-899X
dc.identifier.urihttps://doi.org/10.1088/1757-899X/1226/1/012048
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/17577
dc.language.isoenen_UK
dc.publisherIOPen_UK
dc.rightsAttribution 3.0 Unported*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/*
dc.titleFar-field pressure measurements of elliptic jets discharged close to a wingen_UK
dc.typeConference paperen_UK

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