Reference : Etude expérimentale des sons auto-entretenus produits par un jet issu d'un conduit et...
Dissertations and theses : Doctoral thesis
Engineering, computing & technology : Mechanical engineering
Etude expérimentale des sons auto-entretenus produits par un jet issu d'un conduit et heurtant une plaque fendue
[en] Experimental study of self-sustained tones produced by a jet flowing out from a duct and impinging on a slotted plate
Billon, Alexis [Université de La Rochelle >]
Université de La Rochelle, ​La Rochelle, ​​France
Docteur de l'université de La Rochelle
Sakout, Anas
Valeau, Vincent
Doan, Kim Son
Lewy, Serge
Roger, Michel
Auregan, Yves
Hamdouni, Aziz
[en] Aeroacoustics ; Self-sustained tones ; slot-tone
[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.
Ministère de la recherche et technologie

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