Patent ID: 8769957

Claim:
A transition piece of a combustor, comprising: a trunk part having an axis and formed in a cylindrical shape, which allows high temperature combustion gas to flow on an inner periphery side of said trunk part, and which supplies the combustion gas to a turbine, a cylindrical trunk main body; a cylindrical exit trunk part which is connected to a downstream end of said trunk main body, and which cooperates with the trunk main body to constitute said trunk part; and a flange which extends from a downstream end part of said exit trunk part toward an outer periphery side of the exit trunk part, wherein said exit trunk part and said flange are of a single-piece product, and on said exit trunk part, at a position on an upstream side of said flange and along the flange, there is formed a groove which recesses from an outer periphery side toward an inner periphery side and which extends around the circumferential direction, and there is formed a cooling fluid passage which extends in a direction along the axis of said trunk part, which opens at the groove, and which ejects a cooling fluid into the groove, and onto a surface of said flange, wherein the groove is formed so that the distance from the outer circumferential surface of the exit trunk part to the groove bottom is longer than the distance from the outer circumferential surface of the exit trunk part to the edge of the cooling fluid passage on the axis side of the transition piece and wherein the cooling fluid passage carries a cooling fluid in a downstream direction and opens into the groove at a position radially between an opening of the groove and a radially innermost portion of the groove.