INVESTIGATION OF SHOCK TURBULENT BOUNDARY-LAYER BLEED INTERACTIONS

A numerical investigation was conducted to determine the effect of ble ed on oblique shock wave/turbulent boundary-layer interactions (SWBLI) . The numerical solutions to the compressible Navier-Stokes equations reveal the flow details throughout the interaction zone and inside the normal bleed slot. Results are presented for an incident oblique shoc k of sufficient strength to cause boundary-layer separation on a flat plate in the absence of bleed at a freestream Mach number of 2.96 and Reynolds number of 1.2 x 10(7)/ft, with bleed applied across the shock impingement location over a range of bleed mass flow rates correspond ing to different values of plenum pressures. The results indicate a co mplex flow structure with large variations in both the normal and tang ential flow velocities across the bleed slot. The flow entrainment int o the slot is accompanied by an expansion-compression wave system with a bow shock originating inside the bleed slot. Increasing the bleed m ass flow by decreasing the plenum pressure caused an initial decrease, then a later increase in the boundary-layer momentum and displacement thickness downstream of the interaction.