# Sons auto-entretenus produits par l'interaction d'un jet plan avec une plaque fendue : étude expérimentale et modélisation du couplage avec un résonateur

Abstract : Self-sustained tones can be produced by the interaction of a plane jet and a slotted plate, with possible coupling with the flow-supply duct acoustic resonances. This study deals with the conditions for an optimal production of the aeroacoustic source, and with the influence of the coupling on this production. An experimental set-up, based on anemometric and microphone measurements, is used together with a model based on the vortex-sound theory. Informations about vortices convection and their synchronisation with the acoustic field are obtained experimentally and used as input-data for the model. A Rossiter''-type law for the evolution of the emission frequency is also obtained experimentally. The modeling results permit to interpret this evolution law as the optimal conditions for the production of the aeroacoustic source. The coupling between the aeroacoustic source and the flow supply duct resonances is also studied. It occurs with the planar modes of the duct if the obstacle is weakly misaligned with respect to the spanwise axis and with non-planar modes otherwise. Moreover, the influence of the input admittance of the duct on the coupling is underlined for the planar case. Finally, the evolution of the measured emitted frequencies is explained by a trade-off between the optimal conditions for the aeroacoustic source and the optimal conditions for the coupling.
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https://tel.archives-ouvertes.fr/tel-00260176
Contributor : Martin Glesser <>
Submitted on : Monday, March 3, 2008 - 2:15:28 PM
Last modification on : Friday, October 23, 2020 - 4:37:18 PM
Long-term archiving on: : Thursday, May 20, 2010 - 8:33:29 PM

### Identifiers

• HAL Id : tel-00260176, version 1

### Citation

Martin Glesser. Sons auto-entretenus produits par l'interaction d'un jet plan avec une plaque fendue : étude expérimentale et modélisation du couplage avec un résonateur. Acoustique [physics.class-ph]. Université de La Rochelle, 2006. Français. ⟨tel-00260176⟩

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