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Conference Paper: Sound generated by a wing with a flap interacting with an eddy
Title | Sound generated by a wing with a flap interacting with an eddy |
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Authors | |
Keywords | Acoustic signature Far-field radiation Fluid-structure interaction problem Leading orders Sound radiations Torsion Springs Trailing edges Vortex sound |
Issue Date | 2013 |
Publisher | Acoustical 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 Proceedings of Meetings on Acoustics, 2013, v. 19 n. 1, article no. 065062, p. 1-6 How to Cite? |
Abstract | Acoustic 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 Identifier | http://hdl.handle.net/10722/191669 |
ISSN | 2023 SCImago Journal Rankings: 0.312 |
DC Field | Value | Language |
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dc.contributor.author | Manela, A | en_US |
dc.contributor.author | Huang, L | en_US |
dc.date.accessioned | 2013-10-15T07:16:20Z | - |
dc.date.available | 2013-10-15T07:16:20Z | - |
dc.date.issued | 2013 | en_US |
dc.identifier.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 Proceedings of Meetings on Acoustics, 2013, v. 19 n. 1, article no. 065062, p. 1-6 | - |
dc.identifier.issn | 1939-800X | - |
dc.identifier.uri | http://hdl.handle.net/10722/191669 | - |
dc.description.abstract | Acoustic 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.language | eng | en_US |
dc.publisher | Acoustical Society of America. The Journal's web site is located at http://acousticalsociety.org/ | en_US |
dc.relation.ispartof | Proceedings of Meetings on Acoustics | - |
dc.rights | Copyright 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 Proceedings of Meetings on Acoustics, 2013, v. 19 n. 1, article no. 065062, p. 1-6 and may be found at https://doi.org/10.1121/1.4799350 | - |
dc.subject | Acoustic signature | - |
dc.subject | Far-field radiation | - |
dc.subject | Fluid-structure interaction problem | - |
dc.subject | Leading orders | - |
dc.subject | Sound radiations | - |
dc.subject | Torsion Springs | - |
dc.subject | Trailing edges | - |
dc.subject | Vortex sound | - |
dc.title | Sound generated by a wing with a flap interacting with an eddy | en_US |
dc.type | Conference_Paper | en_US |
dc.identifier.email | Huang, L: lixi@hku.hk | en_US |
dc.identifier.authority | Huang, L=rp00119 | en_US |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1121/1.4799350 | - |
dc.identifier.scopus | eid_2-s2.0-84878958543 | - |
dc.identifier.hkuros | 225354 | en_US |
dc.identifier.volume | 19 | - |
dc.identifier.issue | 1 | - |
dc.identifier.spage | article no. 065062, p. 1 | - |
dc.identifier.epage | article no. 065062, p. 6 | - |
dc.publisher.place | United States | - |
dc.customcontrol.immutable | sml 131121 | - |
dc.identifier.issnl | 1939-800X | - |