AN EXPERIMENT INVESTIGATION ON SHOCKINDUCED TURBULENT BOUNDARY LAYER SEPARATION FLOW-FIELD

摘要

High-speed flow past a blunt fin on a surfaceresults in a interaction flow-field. And the finshock causes the boundary layer to separateahead of the fin. The interaction flow-fieldincludes horseshoe vortices near the surfaceand a lambda-type shock pattern in the plane ofsymmetry ahead of the fin. To understanding theinteraction flow field, Pressure Sensitive Painthas been made to study the flow-field inducedby blunt fin turbulent boundary layerinteractions at Mach 5. The experiments werecarried out with a model comprising a flat platewith a single blunt fin. PSP was sprayed on theflat plate and the blunt fin surface, which wasilluminated by a high power UV light. And ahigh-speed camera was used during theexperiments to measure the luminescence. Afterimage processing, the pressure distributions onthe blunt fin were obtained.