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An aft frame for a transition duct of a gas turbine combustor includes a main body having an outer rail, an inner rail, a first side rail circumferentially separated from an opposing second side rail, a forward portion, an aft portion and an outer surface. An inlet port extends through the outer sur

An aft frame for a transition duct of a gas turbine combustor includes a main body having an outer rail, an inner rail, a first side rail circumferentially separated from an opposing second side rail, a forward portion, an aft portion and an outer surface. An inlet port extends through the outer surface and an exhaust port extends through the forward portion. A serpentine cooling passage is defined within the main body beneath the outer surface. The serpentine cooling passage is in fluid communication with the inlet port and the exhaust port. A conduit may be connected to the exhaust port for routing a compressed working fluid away from aft frame.

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1. An aft frame and a transition piece including the aft frame, of a gas turbine, the aft frame comprising: a. a main body including an outer rail, an inner rail, a first side rail circumferentially separated from an opposing second side rail, a forward portion, an aft portion and an outer surface;b

1. An aft frame and a transition piece including the aft frame, of a gas turbine, the aft frame comprising: a. a main body including an outer rail, an inner rail, a first side rail circumferentially separated from an opposing second side rail, a forward portion, an aft portion and an outer surface;b. an inlet port;c. an exhaust port;d. a serpentine cooling passage defined within the main body beneath the outer surface, wherein the serpentine cooling passage is in fluid communication with the inlet port and the exhaust port; ande. a conduit coupled to the exhaust port, wherein the conduit is a tube that extends across an outer surface of the transition piece, and wherein the conduit defines an outlet along the transition piece, and wherein the outlet is upstream relative to the exhaust port relative to a direction of a flow of combustion gases through the transition piece. 2. The aft frame as in claim 1, wherein the serpentine cooling passage winds beneath the outer surface between the forward portion and the aft portion two or more times within the main body. 3. The aft frame as in claim 1, wherein the serpentine cooling passage is at least partially defined in the outer rail. 4. The aft frame as in claim 1, wherein the serpentine cooling passage is at least partially defined in the inner rail. 5. The aft frame as in claim 1, wherein the serpentine cooling passage is at least partially defined in the first side rail. 6. The aft frame as in claim 1, wherein the serpentine codling passage is at least partially defined in the second side rail. 7. A transition piece assembly, comprising: a. a transition duct having an upstream end and a downstream end;b. an outer sleeve that extends circumferentially around the transition duct;c. a cooling annulus defined between the transition duct and the outer sleeve; andd. an aft frame integral with the downstream end of the transition duct and a forward edge of the outer sleeve, the aft frame comprising: i. a main body including an outer rail, an inner rail, a first side rail circumferentially separated from an opposing second side rail, a forward portion, an aft portion and an outer surface;ii. an inlet port;iii. an exhaust port in fluid communication with the cooling annulus;iv. a serpentine cooling passage defined within the main body beneath the outer surface, wherein the serpentine cooling passage is in fluid communication with a the inlet port and the exhaust port; andv. a conduit coupled to the exhaust port, wherein the conduit is a tube that extends across an outer surface of the transition duct, and wherein the conduit defines an outlet along the transition piece, and wherein the outlet is upstream relative to the exhaust port relative to a direction of a flow of combustion gases through the transition piece. 8. The transition piece assembly as in claim 7, wherein the serpentine cooling passage winds beneath the outer surface between the forward portion and the aft portion two or more times within the main body. 9. The transition piece assembly as in claim 7, wherein the serpentine cooling passage is at least partially defined in the outer rail. 10. The transition piece assembly as in claim 7, wherein the serpentine cooling passage is at least partially defined in the inner rail. 11. The transition piece assembly as in claim 7, wherein the serpentine cooling passage is at least partially defined in the first side rail. 12. The transition piece assembly as in claim 7, wherein the serpentine cooling passage is at least partially defined in the second side rail. 13. The transition piece assembly as in claim 7, wherein the conduit extends across the outer surface of the transition duct and towards the upstream end of the transition duct within the cooling annulus. 14. A gas turbine, comprising: a. a compressor;b. a combustion section disposed downstream from the compressor, the combustion section including a combustor and an outer casing at least partially surrounding the combustor, the outer casing being in fluid communication with the compressor;c. a turbine disposed downstream from the combustion section; andd. wherein the combustor comprises: i. a fuel nozzle and an annular liner defining a combustion chamber defined downstream from the fuel nozzle;ii. a transition duct extending downstream from the combustion chamber, the transition duct having a downstream end terminating at an inlet to the turbine;iii. an outer sleeve extending circumferentially around the transition duct to define a cooling annulus there between; andiv. an aft frame integral with the downstream end of the transition duct and a forward edge of the outer sleeve, the aft frame having a main body defining a forward portion, an aft portion, an outer surface, an inlet port, an exhaust port in fluid communication with the cooling annulus, a serpentine cooling passage defined within the main body beneath the outer surface, wherein the serpentine cooling passage is in fluid communication with the inlet port and the exhaust port, and a conduit coupled to the exhaust port, wherein the conduit is a tube that extends across an outer surface of the transition duct within the cooling annulus, and wherein the conduit defines an outlet along the transition piece, and wherein the outlet is upstream relative to the exhaust port relative to a direction of a flow of combustion gases through the transition piece. 15. The gas turbine as in claim 14, wherein the serpentine cooling passage winds beneath the outer surface between the forward portion and the aft portion two or more times within the main body. 16. The gas turbine as in claim 14, wherein the aft frame main body further comprises an outer rail, an inner rail, a first side rail circumferentially separated from an opposing second side rail, wherein the serpentine cooling passage is at least partially defined one or more of the outer rail, the inner rail, the first side rail or the second side rail. 17. The gas turbine as in claim 14, wherein the conduit within the cooling annulus extends upstream of a fuel injector. 18. The gas turbine as in claim 14, wherein the conduit provides for fluid communication between the exhaust port and the combustion chamber. 19. The gas turbine as in claim 14, wherein the conduit includes two or more outlets providing fluid communication between the exhaust port and the cooling annulus. 20. The gas turbine as in claim 14, wherein the conduit extends toward the combustor to provide fluid communication between the exhaust port and the combustor.