Sintered metal porous media strut of the scramjet combustion chamber was manufactured to provide thermal protection for the scramjet.Transpiration cooling using water as coolant was studied experimentally.The experimental results show that the heat transfer between the mainstream and the strut wall can be effectually reduced.The cooling efficiency reaches 93% when blowing ratio of 2%.Cooling efficiency increases with the rising coolant blowing ratio

and tends to be 100%.Under two mainstream temperatures

the cooling efficiency at the same measuring points and blowing ratios varies little.Thermal response of the surface temperature of strut after stopping coolant supply was also studied.Water evaporation process was analyzed in three stages.