| 摘要 |
PURPOSE:To reduce thermal stresses due to temperature difference between a tail cylinder and an impinge cover by fixing the impinge cover on the outside of the tail cylinder of a combustor, forming corrugated grooves in the axial direction of the cover, and forming a bent hem at the fixed part. CONSTITUTION:An impinge cover 11 provided with a number of cooling air inlet holes 12 for cooling a tail cylinder 5 of a combustor is arranged with a specified gap on the outside of the tail cylinder. While the cooling air enters the inside of the impinge cover 11 via the inlet holes 12 and flows out of through holes 13 arranged on the most downstream side of the tail cylinder 5 of the combustor, at this time a great temperature difference is produced between both of the parts 5 and 11. To cope with this, corrugated grooves 14 are formed on the impinge cover 11 to absorb circumferential expansion. Projections 15 are also formed on the impinge cover 11 to keep the gap between the parts 5 and 11 constant. The difference in thermal elongations between both of the parts 5 and 11 is absorbed by deformations of bent lines 16 and 17 formed on both hems of the impinge cover 11.
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