Control of Pseudo-Shock by the Slot-Injection.

It is well known that the boundary layer separation, which is induced by the adverse pressure gradient of pseudo-shock, affects the dynamical feature of the pseudo-shock such as the shape of the first shock, the pressure recovery rate and the self-induced oscillation. So, it is considered that the suppression of the separation is effective on the shock wave/boundary layer interaction. In this research, the boundary layer control with the slot injection is studied experimentally and numerically. The expriments were carried out in a blow-down supersonic wind tunnel at a free stream Mach number of 2.0. Numerical simulations were made with the 2-D compressible Navier-Stokes code. In sloving the equations, 2nd-order accurate Harten-Yee's upwind TVD scheme and κ-e turbulence model modifed for compressibility effects were used. The result shows that the separtion is appreciably suppressed and the first shock changes in its shape, so that the wall pressure fluctuation is greatly suppressed. In addition, the small slot high results in the lower total pressure loss.