Evolution of coherent structures in the shock wave / boundary layer interaction zone for a both laminar and turbulent incoming flow conditions

The paper presents characteristics of coherent structures that develop in the shock wave / boundary layer interaction zone. Experiments were performed on a flat plate for two states of the oncoming boundary layer: laminar and turbulent. The shock wave was generated by a wedge-type body placed ahead the plate. The data are obtained from hot-wire anemometry technique. Flow structures in a boundary layer were studied using the analysis of coherence spectra. It was demonstrated that the transversal size of coherent patterns varies insignificantly in the interaction zone between shock waves and boundary layer.