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Conference Paper: Sound generated by a wing with a flap interacting with an eddy

TitleSound generated by a wing with a flap interacting with an eddy
Authors
KeywordsAcoustic signature
Far-field radiation
Fluid-structure interaction problem
Leading orders
Sound radiations
Torsion Springs
Trailing edges
Vortex sound
Issue Date2013
PublisherAcoustical Society of America. The Journal's web site is located at http://acousticalsociety.org/
Citation
The 21st International Congress on Acoustics (ICA 2013) cum 165th Meeting of the Acoustical Society of America and 52nd Meeting of the Canadian Acoustical Association, Montreal, QC., 2-7 June 2013. In Meetings on Acoustics Proceedings, 2013, v. 19, article no. 065062, p. 1-6 How to Cite?
AbstractAcoustic signature of a rigid wing, equipped with a movable downstream flap and interacting with a line vortex, is studied in a two-dimensional low-Mach number flow. The flap is attached to the airfoil via a torsion spring, and the coupled fluid-structure interaction problem is analysed using thin-airfoil methodology and application of the Brown and Michael equation. It is found that incident vortex passage above the airfoil excites flap motion at the system natural frequency, amplified above all other frequencies contained in the forcing vortex. Far-field radiation is analysed using Powell-Howe analogy, yielding the leading order dipole-type signature of the system. It is shown that direct flap motion has a negligible effect on total sound radiation. The characteristic acoustic signature of the system is dominated by vortex sound, consisting of relatively strong leading and trailing edge interactions of the airfoil with the incident vortex, together with late-time wake sound resulting from induced flap motion. In comparison with the counterpart rigid (non-flapped) configuration, it is found that the flap may act as sound amplifier or absorber, depending on the value of flap-fluid natural frequency. The study complements existing analyses examining sound radiation in static- and detached-flap configurations.
Persistent Identifierhttp://hdl.handle.net/10722/191669
ISSN

 

DC FieldValueLanguage
dc.contributor.authorManela, Aen_US
dc.contributor.authorHuang, Len_US
dc.date.accessioned2013-10-15T07:16:20Z-
dc.date.available2013-10-15T07:16:20Z-
dc.date.issued2013en_US
dc.identifier.citationThe 21st International Congress on Acoustics (ICA 2013) cum 165th Meeting of the Acoustical Society of America and 52nd Meeting of the Canadian Acoustical Association, Montreal, QC., 2-7 June 2013. In Meetings on Acoustics Proceedings, 2013, v. 19, article no. 065062, p. 1-6en_US
dc.identifier.issn1939-800X-
dc.identifier.urihttp://hdl.handle.net/10722/191669-
dc.description.abstractAcoustic signature of a rigid wing, equipped with a movable downstream flap and interacting with a line vortex, is studied in a two-dimensional low-Mach number flow. The flap is attached to the airfoil via a torsion spring, and the coupled fluid-structure interaction problem is analysed using thin-airfoil methodology and application of the Brown and Michael equation. It is found that incident vortex passage above the airfoil excites flap motion at the system natural frequency, amplified above all other frequencies contained in the forcing vortex. Far-field radiation is analysed using Powell-Howe analogy, yielding the leading order dipole-type signature of the system. It is shown that direct flap motion has a negligible effect on total sound radiation. The characteristic acoustic signature of the system is dominated by vortex sound, consisting of relatively strong leading and trailing edge interactions of the airfoil with the incident vortex, together with late-time wake sound resulting from induced flap motion. In comparison with the counterpart rigid (non-flapped) configuration, it is found that the flap may act as sound amplifier or absorber, depending on the value of flap-fluid natural frequency. The study complements existing analyses examining sound radiation in static- and detached-flap configurations.-
dc.languageengen_US
dc.publisherAcoustical Society of America. The Journal's web site is located at http://acousticalsociety.org/en_US
dc.relation.ispartofMeetings on Acoustics Proceedingsen_US
dc.rightsMeetings on Acoustics Proceedings. Copyright © Acoustical Society of America.-
dc.rightsCopyright 2013 Acoustical Society of America. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the Acoustical Society of America. The following article appeared in POMA 19, 065062 and may be found at http://scitation.aip.org/content/asa/journal/poma/19/1/10.1121/1.4799350.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectAcoustic signature-
dc.subjectFar-field radiation-
dc.subjectFluid-structure interaction problem-
dc.subjectLeading orders-
dc.subjectSound radiations-
dc.subjectTorsion Springs-
dc.subjectTrailing edges-
dc.subjectVortex sound-
dc.titleSound generated by a wing with a flap interacting with an eddyen_US
dc.typeConference_Paperen_US
dc.identifier.emailHuang, L: lixi@hku.hken_US
dc.identifier.authorityHuang, L=rp00119en_US
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1121/1.4799350-
dc.identifier.scopuseid_2-s2.0-84878958543-
dc.identifier.hkuros225354en_US
dc.identifier.volume19-
dc.identifier.spage1en_US
dc.identifier.epage6en_US
dc.publisher.placeUnited States-
dc.customcontrol.immutablesml 131121-

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