Research on thermal protection efficiency by means of cooling gas injection through porous elements (“porous” cooling)
	Shadow photo of porous surface flown over by supersonic air stream as cooling gas (air) is being injected through it. Boundary layer has been sucked off.
	Shadow photo of porous surface flown over by subsonic air stream as cooling gas (air) is being injected through it. Boundary layer has been sucked off.
	Shadow photo of porous surface flown over by supersonic air stream, as cooling gas (air) is being injected through it while interacting with falling shock wave.
	Shadow photos of porous surface flown over by supersonic air stream, as cooling gas (air) is being injected through it with different intensity.