Influence of shock waves on supersonic transpiration cooling

•Shock wave impact on transpiration cooling for sintered porous plate was investigated.•The shock wave obstructs the coolant flow through the porous plate.•The cooling efficiency recovers with high coolant blowing ratios. This paper experimentally and numerically investigates the effect of shock waves on transpiration cooling of a porous plate. The experiments were conducted in a wind tunnel of Mach number 2.8, wherein oblique shock waves were impinged onto the porous plate. A numerical simulation model was used to obtain detailed temperature and flow field distributions near the porous plate surface. The effects of different coolant blowing ratios and shock wave intensities on the transpiration cooling efficiency were studied. The results show that the transpiration cooling efficiency reduces because of the impinging oblique shock waves with the decrease in the fluid velocity near the porous wall, resulting in an increase in the local fluid static temperature. Moreover, the oblique shock waves increase the local static pressure, thus obstructing the coolant outflow and increasing the local wall temperature.