Abstract
Abstract : This study deals with aerodynamics phenomena in the wake of a flameholder in a high speed air flow. The Particle Image Velocimetry (PIV) technique has been used to get the velocity fields. The flameholder has a simple V-gutter shape and allows the injection of fuel gas by a pipe with a row of small holes. We observed in the high speed air flow the same kind of phenomena as in the water flow : some vortices are shed alternately from either edge of the flameholder. But in the air flow, some small vortexes appear on the outline of the main eddies as a result of much greater Reynolds number. When the fuel gas is injected, the flow pattern changes drastically and the vortex shedding doesn't occur anymore. A mixing zone between fuel and air appears in the wake of the flameholder. The better understanding of the mixing process resulting from this study should be useful for the design of the ram combustor.
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