Shock Impingement caused by Boundary Layer Separation Ahead of Blunt Fins

摘要

High speed flow past a blunt fin on a surface results in a fin bow shock which causes the boundary layer to separate from the surface ahead of the fin, resulting in horseshoe vortices near the surface and a lambda-type shock pattern ahead of the fin. The shock wave emanating from the separated flow region impinges on the fin bow shock and causes intense heating and high pressures locally on the fin leading edge. A research program was conducted to examine and to obtain a better understanding of these interaction flow fields; Mach three flows were surveyed ahead of blunt fins on a flat plate surface with turbulent boundary layers. (Author)