Numerical Study of Three-Dimensional Separated Flows Around a Sweptback Blunt Fin

摘要

A series of numerical simulations was carried out for supersonic flow past a blunt fin mounted on a flat plate with progressively increasing leading edge sweepback. The numerical result for zero degree sweep (vertical fin) was first validated with a known numerical solution and experimental data at Mach 2.95 and unit Reynolds number of 64 million per meter. The upstream condition of the interacting region was characterized by a fully developed turbulent boundary layer with a thickness identical to that of the fin diameter. The upstream and spanwise influence of the fin decreased significantly with increasing sweepback. Under the given flow conditions, the bifurcation of the phase portrait of the surface shear-stress vector was observed between the sweepback angles of 60 to 80 degrees. (sdw)