Flow Control Effect on Unsteadiness of Shock Wave Induced Separation

In usual cases of significant pressure gradients and strong shocks, the front shock takes a fixed location along the wall, at which separation starts. Usually the rear shock is responding to vortex sheding by its deflection angle. In consequence main shock and rear shocks are moving whilst front shock is stable. The goal of the measurements presented here is to find out how the. lambda-foot behaves during shock oscillations in the case when front shock is not fixed by the pressure gradient. Unsteady shock behaviour is also investigated when air jet vortex generators (AJVG) are used. Counteraction of the separation is directly related to the influence on unsteady processes in the shock wave induced separation.