Vortex sound in unconfined flows : application to the coupling of a jet-slot oscillator with a resonator

Autor: Vincent Valeau, M. Glesser, Anas Sakout
Přispěvatelé: Laboratoire d'Etudes Aérodynamiques (LEA), Université de Poitiers-ENSMA-Centre National de la Recherche Scientifique (CNRS), Caton, Samuel, Centre National de la Recherche Scientifique (CNRS)-ENSMA-Université de Poitiers, Laboratoire des Sciences de l'Ingénieur pour l'Environnement - UMR 7356 (LaSIE), Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)
Jazyk: angličtina
Rok vydání: 2008
Předmět:
Engineering
Acoustics and Ultrasonics
Acoustics
02 engineering and technology
01 natural sciences
Synchronization
010305 fluids & plasmas
Pipe flow
Resonator
0203 mechanical engineering
0103 physical sciences
Energy transformation
Duct (flow)
[PHYS.MECA.MEFL] Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph]
[PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph]
ComputingMilieux_MISCELLANEOUS
[PHYS]Physics [physics]
business.industry
Oscillation
Mechanical Engineering
[PHYS.MECA]Physics [physics]/Mechanics [physics]
Condensed Matter Physics
[PHYS.MECA.ACOU]Physics [physics]/Mechanics [physics]/Acoustics [physics.class-ph]
Vortex
020303 mechanical engineering & transports
Computer Science::Sound
Mechanics of Materials
Aeroacoustics
business
Zdroj: J. of Sound Vibration
J. of Sound Vibration, 2008, 314 (3-5), pp. 635-649
Journal of Sound and Vibration
Journal of Sound and Vibration, Elsevier, 2008, 314 (3-5), pp.635-649. ⟨10.1016/j.jsv.2008.01.012⟩
ISSN: 0022-460X
1095-8568
DOI: 10.1016/j.jsv.2008.01.012⟩
Popis: The aeroacoustical coupling of a jet-slot oscillator to the acoustic resonances of the flow-supply duct is studied in this paper. This configuration, producing self-sustained tones, is original in particular because the source domain is unconfined and the coupling occurs to high-order acoustic resonances. The development of a model, based on the Howe's corollary of the vortex-sound theory permits the flow-acoustic interactions induced in the production of such tones to be modelled theoretically. This model, together with a careful experimental exploration, provided a description of this aeroacoustic sound source. The findings show that the combination of two mechanisms determines the operating frequency that maximizes the acoustic fluctuations responsible for the production of the tones: (i) the energy exchange between the hydrodynamic and the acoustic fluctuations of the fluid, and (ii) the enhancement of the acoustic oscillation by the resonances. Some differences from the usual behaviour of acoustically coupled self-sustained oscillations—in particular, related to the oscillation amplitude and the synchronization between the vortical and acoustical fields—are highlighted.
Databáze: OpenAIRE
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