Abstract:
A combustor (37) for a gas turbine engine (21) is provided. The combustor includes a housing (33) at least in part defining an internal combustion chamber (47) of the combustor, a combustor component held in communication with the combustion chamber, and a ferrule (37) generally coupled to the housing and being moveable relative thereto between a first position and a second position, the ferrule having a primary opening (51) through which the combustor component extends for support of the combustor component by the ferrule such that the combustor component is moveable conjointly with the ferrule relative to the housing, the ferrule further having a plurality of purge gas openings (55,57,59) formed therein separate from and in transversely spaced relationship with the primary opening to allow purge gas to flow through the ferrule into the combustion chamber, the purge gas openings being located in the ferrule such that in the first position of the ferrule the purge gas openings comprise at least one blocked purge gas opening that is blocked against the flow of purge gas therethrough into the combustion chamber and at least one unblocked purge gas opening through which purge gas is permitted to flow into the combustion chamber, and in the second position of the ferrule at least one of the blocked purge gas openings of the first ferrule position is unblocked to permit the flow of purge gas therethrough into the combustion chamber.
Abstract:
A two-stage fuel nozzle assembly (56) for a gas turbine engine. The primary combustion region (120) is centrally positioned and includes a fuel injector (122) that is surrounded by one or more swirl chambers (132, 160) to provide a fuel air mixture that is ignited to define a first stage combustion zone. A secondary combustion region is provided by an annular housing (168) that surrounds the primary combustion region (120) and it includes a secondary fuel injector (126) having a radially-outwardly-directed opening (172) and surrounded by an annular ring (128) that includes openings (194) for providing a swirl chamber for the secondary combustion region (124). Cooling air is directed angularly between the primary and secondary combustion zones to delay intermixing and thereby allow more complete combustion of the respective zones prior to their coalescing further downstream. The primary combustion region (120) is activated during idle and low engine power conditions, and both the primary (120) and secondary (124) combustion regions are activated during high engine power conditions.
Abstract:
A method for assembling a gas turbine engine (13) includes coupling an axisymmetric structure within the gas turbine engine, wherein the axisymmetric structure includes at least one mounting bushing (3) extending from a radially outer surface of the axisymmetric structure, and inserting a pin (110) having a crowned surface at least partially into the mounting bushing such that the pin provides both axial and tangential support to the axisymmetric structure, and securing the pin to the gas turbine engine utilizing a retaining assembly (140).
Abstract:
A combustor (37) for a gas turbine engine (21) is provided. The combustor includes a housing (33) at least in part defining an internal combustion chamber (47) of the combustor, a combustor component held in communication with the combustion chamber, and a ferrule (37) generally coupled to the housing and being moveable relative thereto between a first position and a second position, the ferrule having a primary opening (51) through which the combustor component extends for support of the combustor component by the ferrule such that the combustor component is moveable conjointly with the ferrule relative to the housing, the ferrule further having a plurality of purge gas openings (55,57,59) formed therein separate from and in transversely spaced relationship with the primary opening to allow purge gas to flow through the ferrule into the combustion chamber, the purge gas openings being located in the ferrule such that in the first position of the ferrule the purge gas openings comprise at least one blocked purge gas opening that is blocked against the flow of purge gas therethrough into the combustion chamber and at least one unblocked purge gas opening through which purge gas is permitted to flow into the combustion chamber, and in the second position of the ferrule at least one of the blocked purge gas openings of the first ferrule position is unblocked to permit the flow of purge gas therethrough into the combustion chamber.
Abstract:
A fuel injector (10) includes an annular main fuel nozzle received within an annular nozzle housing, a main nozzle fuel circuit having at least one annular leg, and a pilot nozzle fuel circuit. Spray orifices (106) of the leg extend through the fuel nozzle and spray wells (220) through the housing are aligned with the orifices (106). The nozzle is designed to generate sufficient static pressure differentials between at least two different ones of the spray wells (220) to purge the main nozzle fuel circuit (102). Spray well portions (222) may be asymmetrically flared out with respect to a spray well centerline (224) in different local streamwise directions (225). Some of the spray well portions (222) may be asymmetrically flared out in a local upstream direction (226) and others in a local downstream direction (228). The local streamwise direction (225) may have an axial component (236) parallel to a nozzle axis about which the annular nozzle housing is circumscribed and a circumferential component (234) around the nozzle housing.
Abstract:
A two-stage fuel nozzle assembly (56) for a gas turbine engine. The primary combustion region (120) is centrally positioned and includes a fuel injector (122) that is surrounded by one or more swirl chambers (132, 160) to provide a fuel air mixture that is ignited to define a first stage combustion zone. A secondary combustion region is provided by an annular housing (168) that surrounds the primary combustion region (120) and it includes a secondary fuel injector (126) having a radially-outwardly-directed opening (172) and surrounded by an annular ring (128) that includes openings (194) for providing a swirl chamber for the secondary combustion region (124). Cooling air is directed angularly between the primary and secondary combustion zones to delay intermixing and thereby allow more complete combustion of the respective zones prior to their coalescing further downstream. The primary combustion region (120) is activated during idle and low engine power conditions, and both the primary (120) and secondary (124) combustion regions are activated during high engine power conditions.