Gas-turbine engine combustion system
First Claim
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1. A gas-turbine engine combustion system comprising:
- a plurality of combustors, a crossfire tube assembly for passing an ignition flame between adjacent combustors, each crossfire tube assembly including an end-tube for passing the ignition flame into and out of a combustor, the end-tube having an inner surface and an outer surface, and means for feeding coolant air into the crossfire tube assembly so as to film-cool the inner surface of the end-tube, wherein the end-tube is connected to the combustor through a sleeve which extends from a wall of the combustor to surround and overlap the end-tube over a part of its length adjacent the combustor, thereby to define an annular gap between the outer surface of the end-tube and an inner surface of the sleeve, the sleeve having inlet means for introducing coolant air into the annular gap so as to film-cool both the outer surface of the end-tube adjacent the combustor wall and the inner surface of the sleeve.
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Abstract
A gas-turbine engine combustion system comprises a plurality of combustors interconnected by crossfire tube assemblies adapted to pass an ignition flame from an ignited combustor to another combustor on start-up of the engine. Each crossfire tube assembly comprises a cooling air inlet for introducing air into the assembly to film-cool its inner, ignition flame-facing surface, and a cooling sleeve surrounding the crossfire tube assembly in the region in which it opens into the combustor. The cooling sleeve directs the cooling air so as to cool the outer surface of the assembly, the inside of the sleeve and the inside surface of the combustor wall adjacent the cooling sleeve.
30 Citations
10 Claims
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1. A gas-turbine engine combustion system comprising:
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a plurality of combustors, a crossfire tube assembly for passing an ignition flame between adjacent combustors, each crossfire tube assembly including an end-tube for passing the ignition flame into and out of a combustor, the end-tube having an inner surface and an outer surface, and means for feeding coolant air into the crossfire tube assembly so as to film-cool the inner surface of the end-tube, wherein the end-tube is connected to the combustor through a sleeve which extends from a wall of the combustor to surround and overlap the end-tube over a part of its length adjacent the combustor, thereby to define an annular gap between the outer surface of the end-tube and an inner surface of the sleeve, the sleeve having inlet means for introducing coolant air into the annular gap so as to film-cool both the outer surface of the end-tube adjacent the combustor wall and the inner surface of the sleeve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10)
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- 8. A gas-turbine engine combustion system in which adjacent combustors are connected by a crossfire tube assembly adapted to pass an ignition flame from an ignited combustor to another combustor, wherein each crossfire tube assembly comprises inlet means for introducing air to film-cool an inner ignition flame-facing surface of the crossfire tube assembly and cooling means surrounding the crossfire tube assembly at its connection to a combustor and adapted to film-cool an outer surface of the crossfire tube assembly, thereby creating film cooling over both inner and outer surfaces of the crossfire tube assembly.
Specification