COMBUSTOR CONNECTION STRUCTURE, COMBUSTOR TRANSITION PIECE, DESIGN METHOD OF THE COMBUSTOR TRANSITION PIECE AND GAS TURBINE

摘要

In a connecting structure for a combustor, a first-stage turbine stator blade (321) of a turbine is adapted such that the ratio of the cross-sectional area of a tail pipe exit of a combustor (2) to the cross-sectional area of a tail pipe entrance of the combustor (2) is set in the range of 0.79 = Dout/Din = 0.9 and such that the tail pipe exit is connected to the turbine stator blade (321). In the first-stage turbine stator blade, the radial dimension (Hin) of an upstream opening in the stator blade (321) is matched to the radial dimension of the tail pipe exit. Also provided is a combustor tail pipe (22) which is mounted to the combustor (2) having the center axis (S) tilted at an angle relative to the axis (R) of a rotor of a gas turbine and leads combustion gas to the turbine (3). The cross-sectional area of the combustor tail pipe (22) constantly decreases from the tail pipe entrance, into which the combustion gas flows, to the tail pipe exit for discharging the combustion gas.