ORBi: Billon Alexis - Etude expérimentale des sons auto-entretenus produits par un jet issu d'un conduit et heurtant une plaque fendue

Reference : Etude expérimentale des sons auto-entretenus produits par un jet issu d'un conduit et he...


	Document type :	Dissertations and theses : Doctoral thesis
	Discipline(s) :	Engineering, computing & technology : Mechanical engineering
	To cite this reference:	http://hdl.handle.net/2268/33766

Title :	Etude expérimentale des sons auto-entretenus produits par un jet issu d'un conduit et heurtant une plaque fendue
Language :	French
Alternative title :	[en] Experimental study of self-sustained tones produced by a jet flowing out from a duct and impinging on a slotted plate
Author, co-author :	Billon, Alexis [Université de La Rochelle >]
Publication date :	21-Nov-2003
Institution :	Université de La Rochelle, La Rochelle, France
Name of the degree :	Docteur de l'université de La Rochelle
Page number :	118
Superviser :	Sakout, Anas
	Valeau, Vincent
President of the jury :	Doan, Kim Son
Member of the jury :	Lewy, Serge
	Roger, Michel
	Auregan, Yves
	Hamdouni, Aziz
Keywords :	[en] Aeroacoustics ; Self-sustained tones ; slot-tone
Abstract :	[en] The production of self-sustained tones (up to 125 dB) by a low Mach number free plane jet impinging on a slotted plate, known as slot-tone, is experimentally studied. For all geometries of the slot’s edge tested, the tones are generated from 6 m/s and when a resonant mode of the duct from which the jet flows out is excited. The Strouhal number associated with the tones fundamental frequency describes stages. These one are linked to the number of vortices present, with vortex pairing possibilities. On the other hand, the frequency domain of the fundamental is defined by the two instability modes of the jet. If the edge of the slot is beveled and if this one is placed backwards to the flow, the tones occurs at a lower speed (3.5 m/s) as soon as the jet becomes turbulent, and the excitation of an acoustic resonator is then not necessary.
Funders :	Ministère de la recherche et technologie
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/33766

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