Abstract: A self-purging fuel injector for a combustor of a gas turbine engine wherein the fuel injector comprises an injector body having first and second air discharge orifices for discharging air to the combustor and first and second fuel passage means having respective first and second fuel discharge orifices for discharging fuel to the combustor. The first and second fuel passages are in communication upstream of the fuel discharge orifices. The first air and fuel discharge orifices have a relationship to establish a pneumatic pressure at the first fuel discharge orifice and the second air and fuel discharge orifices have a relationship to establish a different pneumatic pressure at the second fuel discharge orifice such that, in the event the supply of fuel to the first and second fuel discharge orifices is interrupted, the fuel residing in the fuel passages between the first and second fuel discharge orifices is subjected to a pressure differential effective to purge the resident fuel into the combustor.

Abstract: A fuel-injector system for a combustor of a gas turbine engine includes first and second fuel injectors rendered operative to discharge fuel to the combustor during a high power regime of engine operation and rendered non-operative during a lower power regime of engine operation. The first and second fuel injectors include respective first and second fuel discharge passages in fuel flow communication to one another and to the combustor via associated fuel discharge lips to sustain a flame region. The first and second fuel injectors are operatively associated with respective first and second air discharge means having air discharge lips for discharging air to the combustor for sustaining the flame region therein.

Abstract: A fuel injector system for a combustor of a gas turbine engine includes first and second fuel injectors rendered operative to discharge fuel to the combustor during a high power regime of engine operation and rendered non-operative during a lower power regime of engine operation. The first and second fuel injectors include respective first and second fuel discharge passages in fuel flow communication to one another and to the combustor via associated fuel discharge lips to sustain a flame region. The first and second fuel injectors are operatively associated with respective first and second air discharge means having air discharge lips for discharging air to the combustor for sustaining the flame region therein. When the fuel injectors are rendered non-operative, different pneumatic pressures are established at the fuel discharge lips to purge fuel from the fuel injectors to the combustor.

Abstract: The airblast fuel injector capable of accommodating high fuel temperature at the injector tip without deleterious fuel vaporization problems and resultant combustion instability in a gas turbine engine includes an annular spring valve mounted on an annular shoulder of an inner injector body forming an inner air chamber with the valve having a cantilever valve head for controlling fuel flow from a fuel swirling orifice in the shoulder near the injector tip. The spring bias of the cantilever valve head is adjusted by lapping the valve head prior to fastening the spring valve to the inner injector body and before the inner injector body is assembled within an outer injector body having means forming an outer annual fuel chamber and air chamber.

Abstract: The airblast fuel injector capable of accommodating high fuel temperature at the injector tip without deleterious fuel vaporization problems and resultant combustion instability in a gas turbine engine includes an annular spring valve mounted on an annular shoulder of an inner injector body forming an inner air chamber with the valve having a cantilever valve head for controlling fuel flow from a fuel swirling orifice in the shoulder near the injector tip. The spring bias of the cantilever valve head is adjusted by lapping the valve head prior to fastening the spring valve to the inner injector body and before the inner injector body is assembled within an outer injector body having means forming an outer annual fuel chamber and air chamber.

Abstract: The fuel distributing and metering assembly provides separate multiple metered fuel flows from a common fuel reservoir by including a rotary valve having multiple valve metering slots for generating separate multiple fuel flows, a valve seat having multiple seat orifices relative to which the valve metering slots are moved for metering the multiple fuel flows, and multiple fuel discharge paths for conducting multiple fuel flows to each of a plurality of fuel injection devices. Each fuel discharge path to each fuel injection device includes multiple upstream transversely spaced discharge passages and multiple downstream discharge passages nested longitudinally one inside the other with the inner downstream discharge passage aligned beneath its associated upstream discharge passage and another downstream discharge passage therearound being transversely displaced relative to its associated upstream discharge passage.

Abstract: The fluid valve assembly includes a hollow movable valve having an open-ended tubular fluid filter in the longitudinal bore of the valve and overlying transverse fluid discharge passages in the hollow valve to filter fluid before it flows through the transverse discharge passages from inside the valve. Downstream of the tubular fluid filter, the hollow valve includes one or more fluid metering passages which are moved relative to a valve seat to control a second flow of fluid from inside the valve. The increased fluid flow longitudinally in the valve bore when the valve is moved from the seat to effect the second fluid flow exerts a washing action on the tubular fuel filter to remove debris or foreign matter therefrom and carry same out through relatively large fluid passages not prone to clogging.

Abstract: The fluid valve assembly includes a hollow movable valve having an open-ended tubular fluid filter in the longitudinal bore of the valve and overlying transverse fluid discharge passages in the hollow valve to filter fluid before it flows through the transverse discharge passages from inside the valve. Downstream of the tubular fluid filter, the hollow valve includes one or more fluid metering passages which are moved relative to a valve seat to control a second flow of fluid from inside the valve. The increased fluid flow longitudinally in the valve bore when the valve is moved from the seat to effect the second fluid flow exerts a washing action on the tubular fuel filter to remove debris or foreign matter therefrom and carry same out through relatively large fluid passages not prone to clogging.

Abstract: A fuel nozzle assembly with integral valve for a gas turbine engine includes an inlet fitting with a tubular wash-type fuel filter therein between a central fuel passage and an annular primary fuel manifold therearound to filter primary fuel flowing through the passage to the annular primary fuel manifold chamber on the inlet fitting. The manifold chamber is in fuel flow relation in the valve housing with a primary fuel take-off passage therein for providing primary fuel flow to a fuel nozzle.

Abstract: An air-blast fuel injector assembly for a gas turbine engine includes an annular shroud means operatively associated with a plurality of sleeve means one inside the other in spaced apart relation. The sleeve means form a liquid fuel-receiving chamber, a water or auxiliary fuel-receiving chamber inside the liquid fuel-receiving chamber for discharging water or auxiliary fuel in addition or alternatively to the liquid fuel, an inner air-receiving chamber for receiving and directing compressor discharge air into the fuel spray cone and/or water or auxiliary fuel to mix therewith from the inside. The shroud means forms an outer air-receiving chamber for receiving and directing other compressor discharge air into the fuel spray cone and/or water or auxiliary fuel from the outside for mixing purposes.

Abstract: A pressure atomizing fuel nozzle assembly for a gas turbine engine includes a support housing in which a pressure-responsive fuel check valve and metering valve are disposed in line to provide a flow of primary fuel for engine start-up and low power operation and secondary fuel for higher power operation. The check valve is located upstream between the fuel inlet and a sleeve inside of which the metering valve is disposed. The check valve prevents the fuel manifold from draining after engine shut-down and controls fuel entry to both the secondary fuel chamber within the sleeve and to an annular primary fuel chamber between the sleeve and support housing connected in fuel flow relation to the secondary chamber by a fuel filter. The primary fuel flows through the primary chamber around the exterior of the secondary chamber and through an annular primary fuel conduit disposed around the secondary fuel conduit in the housing strut to the nozzle attached to the strut.

Abstract: A fuel distribution valve assembly is provided with a laminated thermal buffer member between the valve housing and inner valve means to prevent binding of the valve means from thermal effects.