Study of passive control in a transonic shock wave boundary-layer interaction

Passive control applied to a turbulent shock wave/boundary-layer interaction has been investigated by considering a two-dimensional channel flow. The held has been probed in great detail by using a two-component laser Doppler velocimetry system to execute mean velocity and turbulence measurements. Four different perforated plates have been considered along with the solid wall reference case, These measurements have shown that passive control deeply modifies the inviscid how-held structure, the single shock being replated by a lambda shock system, This modified compression induces a substantial reduction of the wave drag associated with the interaction, On the other hand, the combined injection-suction effect taking place in the control region provokes an increase of the viscous drag, which nearly outbalances the reduction in wave drag, It was found that passive control induced a modest decrease of the total drag compared to the solid wall case, Moreover, the experimental wall transpiration velocity distribution in the control region is well represented by the usual laws.