To attempt to increase the passing speed of a cooling medium, to increase the heat transfer amount by increasing the heat transfer area and to reduce the necessary amount of the medium by spirally forming a cooling medium passage provided in a burner inner cylinder.
In a gas turbine burner, the air output from a compressor is used as combustion air, and the part is used as burner cooling air, tail cylinder cooling air and sealing are (generally called cooling air 9). Then, the inner cylinder of the turbine is formed in a double structure having an inner wall 1 and a outer wall 2. In this case, a plurality of spiral grooves 12 from one end to the other is provided on the outer periphery of the wall 1, and a cooling air hole 3 is so formed as to pass the wall 2. The part of the air output from the compressor is introduced from the hole 3 into the groove 12 as the air 9. At this time, the passage is formed of the groove 12 provided on the outer surface of the wall 1 to thereby increase the length of the passage, and the surface area is increased to thereby improve the cooling efficiency.
INADA MITSURU
TANIMURA SATOSHI
SATO NOBUO
