Effect of the Single Roughness on Shock Wave/Laminar Boundary Layer Interaction

The paper deals with an experimental study of the wake behind a single roughness on the shock wave/laminar boundary layer interactions (SWBLI) for the flow Mach number M = 1.45. Incident shock wave was generated by a wedge inducing the separation of the boundary layer developed on the flat plate. 2D PIV measurements were carried out in 10–15 sections to study 3D flow structure. The effect of roughness height and its location was studied. It was found that a pair vortices is generated as a result of interaction of the shock wave and the turbulent wake. This flow pattern is significantly different from the case of turbulent incoming boundary layer.