Experimental investigation of the vibration of a slotted plate and the acoustic field in a plane impinging jet

Hassan Hasan Assoum , Anas Sakout , Mouhammad El Hassan , Jérôme Vetel , Ahlem Alia , Kamel Abed-Meraïm (1)

1 LEPTIAB - Laboratoire d'Étude des Phénomènes de Transfert et de l'Instantanéité : Agro-industrie et Bâtiment

The impinging jet is a flow configuration in which a fluid issuing from a simple geometry hits a wall (perpendicular or with angle). Impinging jet exhibits rich phenomena in terms of vortex structures and fluid-structure interaction. These phenomena become more complicated if the obstacle (a plate in this study) has a slot and are accompanied in some cases by a high level of noise due to the installation of a loop of self-sustained tones. Several parameters influence these phenomena such as the Reynolds number and the plate to nozzle distance. Therefore, we consider a plane jet issuing from a rectangular nozzle and a slotted plate. The sound pressure and the plate vibration are respectively measured using a microphone and accelerometers mounted on the plate. The spectra of both sound and vibration signal and the corresponding coherences are presented. This study brings out the correlation between the plate vibration and the acoustic field in a plane impinging jet for two Reynolds numbers (Re = 12350 and Re = 18200).

Mots clés: self-sustained tones; Vibration; spectrum; coherence

Domaines: Acoustique [physics.class-ph]

Hassan Hasan Assoum, Anas Sakout, Mouhammad El Hassan, Jérôme Vetel, Ahlem Alia, et al.. Experimental investigation of the vibration of a slotted plate and the acoustic field in a plane impinging jet. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810574⟩