| 摘要 |
PURPOSE:To improve the thermal efficiency of a gas turbine and to hold the metal temperature of each of tail pipes and combustor liners at an allowable value or less, by a method wherein a flow sleeve having a given gap outside of the tail pipe is mounted throughout except both sides located down a line from the tail pipe, and impinge cooling and convection cooling are effected according to a metal temperature. CONSTITUTION:An opening part 16 of a tail pipe flow sleeve 4 is mounted in a range where a velocity of flow of main flow gas in a tail pipe 4 is high and the metal temperature of the wall of the tail pipe 3 is increased. A portion in this range has a structure where fluid for cooling being injected through a plurality of injection nozzles formed in the tail pipe flow sleeve 4 is made to collide against the wall surface of the tail pipe 3 to effect impinge-cooling. An opening part 15 of the tail pipe flow sleeve 4 introduces a remaining amount of the fluid for cooling to the tail pipe flow sleeve 4 in association with an opening part 17 of the side of the tail pipe. The fluid for cooling through the opening parts 15 and 17 is joined with the fluid for cooling through the opening part 16, and flows through a gap between the tail pipe 3 and the tail pipe flow sleeve 4 toward the upper stream side. The tail pipe 3 in this range is convection-cooled by the flow to hold the metal temperature of the wall of the tail pipe 3 at an allowable temperature or less.
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