Tail tube seal structure for the combustor of a gas turbine

摘要

In a tail tube seal structure of gas turbine, a U-shaped groove (1a) is provided at one side of a tail tube seal (1) where a flange (86a) of a tail tube outlet (86) is fitted, and a pi-shaped groove (1b) is provided at other side of the tail tube seal (1) where a gas pass side flange end (103a) is fitted, thereby composing the seal of the connection area. An inclined cooling holes (1d) are drilled in the tail tube seal (1) in addition to the cooling holes (1c) existing conventionally. The cooling air (92) flows out from the inclined holes (1d) and cools the gas pass side of the groove (1b) due to the film effect. Therefore, the difference in thermal expansion between the groove (1a) and flange end (103a) is decreased, the wear of this area is decreased, and the reliability of the seal is enhanced.