La nature des instabilités de l'écoulement régissant les sons auto-entretenus produits par l'impact d'un jet plan à faible nombre de Mach sur une plaque fendue, configuration dénommée bruit de fente, est identifiées expérimentalement. Pour un même nombre de Reynolds, les fréquences de l'instabilité naturelle de la couche de cisaillement et du mode de battement du jet libre délimitent les valeurs des fréquences d'émission mesurées. Les oscillations aux plus basses fréquences sont le résultat de l'amplification du mode de battement du jet et celles de plus hautes fréquences celui de l'amplification de l'instabilité de la couche de cisaillement.
The nature of the instability governing the self-sustained tones produced by a low Mach number plane jet impinging on a slotted plate, known as slot-tone, is identified experimentally. For a given Reynolds number, the natural shear-layer and the jet column mode frequencies of the free jet delimit the values of the measured slot-tone operating frequencies. The oscillations at lower frequencies are the result of the amplification of the jet column mode, and those at higher frequencies correspond to the shear layer instabilities.
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Keywords: Instability, Acoustics, Self-sustained tones, Jet, Slot-tone
Alexis Billon 1 ; Vincent Valeau 1 ; Anas Sakout 1
@article{CRMECA_2004__332_7_557_0, author = {Alexis Billon and Vincent Valeau and Anas Sakout}, title = {Instabilit\'es de l'\'ecoulement produisant le bruit de fente}, journal = {Comptes Rendus. M\'ecanique}, pages = {557--563}, publisher = {Elsevier}, volume = {332}, number = {7}, year = {2004}, doi = {10.1016/j.crme.2004.02.022}, language = {fr}, }
Alexis Billon; Vincent Valeau; Anas Sakout. Instabilités de l'écoulement produisant le bruit de fente. Comptes Rendus. Mécanique, Volume 332 (2004) no. 7, pp. 557-563. doi : 10.1016/j.crme.2004.02.022. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2004.02.022/
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