Numerical investigation of bleed on three-dimensional turbulent interactions due to sharp fins

A numerical investigation is focused on the effect of bleed on the three-dimensional turbulent interaction generated by a sharp fin at Mach 3. For an incipiently separated configuration (8 deg fin, Re_δ = 5.6 × 10⁵), 23% suction is applied over a rectangular area beneath the inviscid shock. Comparison with experimental data and analysis of computed results indicates that the effect of bleed is primarily to reduce surface angularity and upstream influence. The major portion of the flow is not influenced by suction. For a strong interaction (20-deg fin, Re_δ = 8.8 × 10s), the effect of bleeding up to 25% of the boundary layer from two distinct regions on the plate jointly covering the region between the line of upstream influence and the base of the fin is studied. Numerical results are compared with available experimental data in the form of surface pressures and boundarylayer surveys of pitot pressure and yaw angle in the absence of bleed. The influence of suction on the overall flowfield and the previously observed vortical structure is remarkably modest, with significant effects restricted to the region adjacent to the plate near the bleed region.