Tomographic and Time-Resolved PIV measurement of an Impinging Jet on a Slotted Plate

¹ LaSIE, University of La Rochelle, Avenue Michel Crépeau, Pôle Sciences et Technologies, 17000 La Rochelle, France
² Beirut Arab University – Tripoli Campus, Corniche El Meena, Tripoli, Lebanon
³ Lias –Ensip, Univeristé de Poitiers, 2 rue Pierre Brousse, TSA 41105, 86073 Poitiers Cedex 9 - France

^* Corresponding author: jana.hamdi@univ-lr.fr

Abstract

In order to reveal the complete topology of unsteady coherent flow structures the instantaneous measurement of the 3D velocity field is being of the great interest in fluid mechanic. Several different methods were proposed to achieve a 3D version of the technique (scanning light sheet, holography, 3D PTV). We aimed in our study to develop a 3D technique than enables to obtain the 3D kinematic field of an impinging jet by using 2D measurements. In this study and in order to validate the proposed technique [1], the tomographic particle image velocimetry technique has been applied to time resolved PIV recordings. The first step before the validation was to study the vortex shedding phenomena between the jet exit and the slotted plate. The experiments were performed at a Re = 4458 with an initial velocity U₀=7m/s using three cameras Phantom V711 and a Nd: YLF LDY 300 Litron laser. In the present study, we analyzed the coherent structures organization by a 3D-velocity visualization. Both mean and fluctuating part of velocity were analyzed for several positions in z. The results has shown that a couple of vortex rolls are created downstream the flow at y/H=2.