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Doctoral thesis viva voce:Tristan Cambonie

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Contact : tristan.cambonie@espci.fr

28 October 2012 13:30 » 18:00 — Schützenberger lecture theater

Experimental study of a Jet in Crossflow at low velocity ratios using volumetric velocimetry

Tristan Cambonie, Doctorant - PhD student Crédits : ESPCI ParisTech
Tristan Cambonie, Doctorant - PhD student Crédits : ESPCI ParisTech

This thesis is dedicated to the experimental study of a Jet In Cross-Flow (JICF). The flow is monophasic and isothermal. The velocity ratio (VR) between jet and cross-flow velocities is low (0.15<VR<3), and the jet exit is flush at the wall. Diverse jet geometries are considered: circular, elliptic, rectangular, and winglet.

This study was realized in hydraulic channel using a new optical velocimetry method (V3V) which provides accurate measurements of the 3 components of the instantaneous velocity field. The whole experimental process was optimized. The physics of the JICF is investigated by means of the average and instantaneous fields, through their statistics and using a spatial follow-up of the main vortical structures.

The influence of the VR on the flow topology is analyzed, and highlights the existence of a blowing transition at very low velocity ratio. We study in detail the trajectories swirling intensities of the main vertical structures, and a new scaling of trajectories, taking into account the boundary layer, is proposed.

These results facilitate the interpretation of the elliptic and rectangular, straight and skewed JICF physics. The study of the half-winglet geometry allowed for an analysis of the winglet configuration, and a better comprehension of their effects on the boundary layer.

All these results allows for a better understanding of the jet in cross-flow physic at low velocity ratios. They should also be useful for flow control experiments, by providing quantitative criteria to choose the relevant physical and geometrical parameters for vortex generators design.

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