SHOCK-WAVE BOUNDARY-LAYER INTERACTIONS WITH BLEED .1. EFFECT OF SLOT ANGLE

The effect of bleed configuration in the interaction region of an obli que shock wave and a turbulent boundary layer was investigated using n umerical simulations, The numerical solution is obtained for the compr essible Navier-Stokes and k-epsilon equations throughout the interacti on zone and inside the slanted and normal bleed slots. Different bleed mass flow rates, up to 16% of the incoming boundary layer, are obtain ed by varying the bleed slot outflow face pressure. Results are presen ted for an incident oblique shock of sufficient strength to cause boun dary-layer separation in the absence of bleed, The results show the no w characteristics including an expansion/compression wave system acros s the slot opening and recirculation zone inside the slot. The perform ance of the different bleed configurations is compared in terms of the discharge coefficient and the boundary-layer characteristics downstre am of the interaction, over a range of bleed mass flow rates. In Part 1, results are presented For bleed applied across the shock impingemen t point through slots at 20-, 30-, 40-, and 90-deg angles to the plate surface, The results indicate considerable change in the flow charact eristics inside the bleed slot with the slant angle. The bleed dischar ge coefficient increased as the slot slant angle decreased, The plate surface friction coefficient downstream of the interaction was much lo wer in the case of bleed through normal slots than slanted slots where it had the characteristics of redeveloping boundary layer.