The effect of angle of attack on the aeroacoustic environment within the weapons bay of a generic UCAV

Simple item page
dc.contributor.authorBacci, David
dc.contributor.authorSaddington, A. J.
dc.contributor.authorBray, Derek
dc.date.accessioned2019-07-30T09:49:18Z
dc.date.available2019-07-30T09:49:18Z
dc.date.issued2019-07-24
dc.description.abstractCavity flow studies are generally concerned with observing the effect of geometry changes whilst maintaining a fixed zero angle of attack. Cavities employed as weapons bays will, however, experience a range of angles of attack. This paper presents the first known results showing the effect of flight angle of attack on the aeroacoustic characteristics of an internal weapons bay installed in an uninhabited combat air vehicle (UCAV). The UCAV geometry consisted of a Boeing M219-type cavity in a Boeing UCAV1303 airframe. Numerical simulation was conducted using a full-scale detached eddy simulation model and representative transonic flight conditions. As well as the reference case of zero degrees, data for angles of attack of 3.0, 4.5 and 6.0 degrees were analysed. Experimental data was used to validate the reference computational model, which agreed with the overall fluctuating sound pressure level (OAFPL) to within the experimental uncertainty of 4 dB. Data from the computational model was post-processed with frequency-domain and time-frequency-domain techniques showing that the flow structure within the weapons bay was altered significantly by the angle of attack changes, affecting the mean pressure distribution, frequency spectra and resonant modes. Overall, increasing the angle of attack from 0.0 to 3.0 degrees produced an increment in the acoustic load whilst a further increase tended to affect the resonance mechanism and thereby reduce the coherence and the temporal footprints of the resonant modes.en_UK
dc.identifier.citationBacci D, Saddington AJ, Bray D. (2019) The effect of angle of attack on the aeroacoustic environment within the weapons bay of a generic UCAV. Aerospace Science and Technology, Volume 93, October 2019, Article number 105315en_UK
dc.identifier.cris23995398
dc.identifier.issn1270-9638
dc.identifier.urihttps://doi.org/10.1016/j.ast.2019.105315
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/14399
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectUCAVen_UK
dc.subjectCavityen_UK
dc.subjectAeroacousticen_UK
dc.subjectTransonicen_UK
dc.titleThe effect of angle of attack on the aeroacoustic environment within the weapons bay of a generic UCAVen_UK
dc.typeArticleen_UK

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Effect_of_angle_of_attack_on_the_aeroacoustic_environment-2019.pdf
Size:
3.83 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 (CDS)