A flow balancing valve for a multistage combustor includes a first pressure feedback line, a first burn line, and a first metering port fluidly connected to the first fuel injector. The flow balancing valve further includes a second pressure feedback line, a second burn line, and a second metering p
A flow balancing valve for a multistage combustor includes a first pressure feedback line, a first burn line, and a first metering port fluidly connected to the first fuel injector. The flow balancing valve further includes a second pressure feedback line, a second burn line, and a second metering port fluidly connected to the second fuel injector. A metering land is located between and defines sizes of the first metering port and the second metering port. An increase in pressure differential between the first pressure feedback line and the second pressure feedback line causes a compensatory movement in the metering land to balance fuel flow for the first fuel injector and the second fuel injector.
대표청구항▼
1. A fuel system for a gas turbine comprising: a fuel supply;a multistage combustor having fuel injectors organized operatively in stages including a first stage having a first fuel injector and a second fuel injector;a first stage fuel metering module fluidly connecting the fuel supply to the first
1. A fuel system for a gas turbine comprising: a fuel supply;a multistage combustor having fuel injectors organized operatively in stages including a first stage having a first fuel injector and a second fuel injector;a first stage fuel metering module fluidly connecting the fuel supply to the first and second fuel injectors; anda flow balancing valve fluidly connecting the first stage fuel metering module and the first and second fuel injectors, the flow balancing valve including: a first pressure feedback line fluidly connected to a first burn line, and a first metering port fluidly located in the first burn line and connected to the first fuel injector;a first input line connecting the first stage fuel metering module to the first burn line;a second pressure feedback line fluidly connected to a second burn line, and a second metering port fluidly located in the second burn line and connected to the second fuel injector;a second input line connecting the first stage fuel metering module to the second burn line;first and second annuli fluidly connected to the first and second pressure feedback lines, respectively;first and second lands fluidly connected to the first and second annuli, respectively; anda metering land attached between the first and second lands, the metering land located between and defining sizes of the first metering port and the second metering port,wherein an increase in pressure differential between the first pressure feedback line and the second pressure feedback line causes a compensatory movement in the metering land to balance fuel flow for the first fuel injector and the second fuel injector. 2. The fuel system of claim 1, wherein the compensatory movement in the metering land further opens the metering port associated with the pressure feedback line having a relatively higher pressure. 3. The fuel system of claim 1, wherein the compensatory movement in the metering land partially closes the metering port associated with the pressure feedback line having a relatively lower pressure. 4. The fuel system of claim 1, wherein substantially equal pressures between the first pressure feedback line and the second feedback line results in substantially equal sizes of the first metering port and the second metering port. 5. The fuel system of claim 1, wherein the metering land includes an o-ring seal. 6. The fuel system of claim 1, wherein the flow balancing valve further includes: a first position limiter; anda second position limiter, wherein the position limiters limit the compensatory movement of the metering land. 7. The fuel system of claim 1, wherein the flow balancing valve further includes: a first spring; anda second spring, wherein the springs balance the metering land between the first metering port and the second metering port. 8. The fuel system of claim 1, wherein the flow balancing valve further includes: a first orifice; anda second orifice, wherein the orifices create a pressure drop in the flow balancing valve. 9. The fuel system of claim 1, wherein the fuel flow metering module further comprises: a positive displacement pump for pumping fuel;a flow meter for measuring fuel flow;a first pressure sensor for sensing fuel pressure;a controller for receiving and analyzing information regarding fuel flow from the flow meter, fuel pressure from the first pressure sensor, and fuel demand from the electronic engine control; andan electric motor for driving the positive displacement pump in accordance with a signal received from the controller to modulate fuel output for the fuel metering module. 10. The fuel system of claim 1, further comprising: a boost pump downstream of the fuel supply;a fuel/oil heat exchanger downstream of the boost pump; anda filter downstream of the fuel/oil heat exchanger and upstream of the fuel flow metering module. 11. The fuel system of claim 1 and further comprising: a first output line fluidly connected to the first metering port such that the metering land controls fluid flow from the first bum line to the first output line by adjusting a size of the first metering port; anda second output line fluidly connected to the second metering port such that the metering land controls fluid flow from the second bum line to the second output line by adjusting a size of the second metering port. 12. A flow balancing valve for a multistage combustor, the flow balancing valve comprising: a first burn line that fluidly connects a first input line to a first fuel injector;a second burn line that fluidly connects a second input line to a second fuel injector;a first pressure feedback line fluidly connected to the first burn line;a second pressure feedback line fluidly connected to the second burn line;a first annulus fluidly connected to the first pressure feedback line;a second annulus fluidly connected to the second pressure feedback line;a first land fluidly connected to the first annulus;a second land fluidly connected to the second annulus;a first metering port located in the first burn line;a second metering port located in the second burn line; anda metering land attached between the first land and the second land, the metering land defining sizes of the first metering port and the second metering port;wherein an increase of pressure in the first pressure feedback line with respect to pressure in the second pressure feedback line causes the first land to move the metering land away from the first metering port, thereby increasing the size of the first metering port and decreasing the size of the second metering port. 13. The flow balancing valve of claim 12, further comprising: an o-ring seal surrounding the metering land to seal a first annulus from a second annulus. 14. The flow balancing valve of claim 13, further comprising: a first wall spaced from the first land; anda first spring in the first annulus, the first spring having a first side attached to the first wall and a second side attached to a first side of the first land. 15. The flow balancing valve of claim 14, further comprising: a second wall space from the second land; anda second spring in the second annulus, the second spring having a first side attached to the second wall and a second side attached to a first side of the second land. 16. The flow balancing valve of claim 15, further comprising: a first position limiter extending from the first side of the first land toward the first wall to prevent the metering land from completely closing the first metering port. 17. The flow balancing valve of claim 16, further comprising: a second position limiter extending from the first side of the second land toward the second wall to prevent the metering land from completely closing the second metering port. 18. The flow balancing valve of claim 17, wherein the first burn line includes a first orifice and the second bum line includes a second orifice.
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