An Experiment Investigation on Shock-induced Turbulent Boundary Layer Separation Flow-field

Abstract

High-speed flow past a blunt fin on a surface results in a interaction flow-field. And the fin shock causes the boundary layer to separate ahead of the fin. The interaction flow-field includes horseshoe vortices near the surface and a lambda-type shock pattern in the plane of symmetry ahead of the fin. To understanding the interaction flow field, oil flow and Pressure Sensitive Paint has been made to study the flow-field induced by blunt fin turbulent boundary layer interactions at Mach 5. The experiments were carried out with a model comprising a flat plate with a single blunt fin. By examining the oil flow results, the flowfield structured was revealed. Also, PSP was sprayed on the flat plate and the blunt fin surface, which was illuminated by a high power UV light. And a high-speed camera was used during the experiments to measure the luminescence. After image processing, the pressure distributions on the blunt fin were obtained.