Combustor connection structure, combustor transition piece, designing method of combustor transition piece and gas turbine

摘要

A cross-sectional area (Dout) of a transition piece outlet is set within a range of 0.79£DoutDin£0.9, relative to a cross-sectional area (Din) of a transition piece inlet of a combustor, and in a first stage turbine nozzle of a turbine connected to the transition piece outlet, a size (Hin) in a radial direction between upstream ends of the inner shroud and the outer shroud has a same dimension as a size (a) in a radial direction of the transition piece outlet. In a combustor transition piece that is included in the combustor having a center line (S) arranged with an angle to an axial center (R) of a rotor of a gas turbine and that guides combustion gas to the turbine, a cross-sectional area is monotonously reduced from the transition piece inlet in which the combustion gas flows to the transition piece outlet from which the combustion gas flows out.

主权项

1. A designing method of a combustor transition piece comprising:
setting an angle of a center line of a combustor relative to an axial center of a rotor of a gas turbine; setting a contraction ratio from a transition piece inlet in which combustion gas flows to a transition piece outlet from which the combustion gas flows out; forming an inner outline in a radial direction, by extending a first straight line in parallel with the center line from an inner end in a radial direction of the transition piece inlet to a downstream side, while maintaining a cross-sectional area of the transition piece inlet, extending a second straight line in parallel with the axial center from an inner end in a radial direction of the transition piece outlet to an upstream side, and connecting the first and second straight lines by an arc; forming an outer outline in the radial direction by smoothly connecting an outer end in a radial direction on a tubular downstream side where the cross-sectional area of the transition piece inlet is maintained, to an outer end in the radial direction of the transition piece outlet; and monotonously reducing a cross-sectional area from the tubular downstream side to the transition piece outlet, along the inner outline in the radial direction and the outer outline in the radial direction.