Centrifugal pump fuel system and method for gas turbine engine
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02C-009/26
F02C-009/00
출원번호
US-0463701
(2003-06-16)
발명자
/ 주소
Wernberg,Donald E.
Schaefer,Paul J.
Hommema,Edward L.
출원인 / 주소
Woodward Governor Company
대리인 / 주소
Reinhart Boerner Van Deuren P.C.
인용정보
피인용 횟수 :
12인용 특허 :
9
초록▼
A fuel system for a gas turbine engine that utilizes a centrifugal pump. The system includes a fuel metering valve that is adapted to set a metered flow of fuel, and a throttle valve that is adapted to accurately control pressure drop across the fuel metering valve. The throttle valve has at least t
A fuel system for a gas turbine engine that utilizes a centrifugal pump. The system includes a fuel metering valve that is adapted to set a metered flow of fuel, and a throttle valve that is adapted to accurately control pressure drop across the fuel metering valve. The throttle valve has at least two variable orifices and a compensation chamber between the variable orifices. The throttle valve includes a differential valve piston slidable in a valve body. The differential valve piston comprises working surfaces of at least two different diameters such that changes in chamber pressures effect different axial forces upon the piston.
대표청구항▼
What is claimed is: 1. A fuel system for a gas turbine engine, the fuel system comprising: a high pressure centrifugal pump adapted to pump fuel from a fuel supply; a fuel metering valve adapted to set a metered flow of fuel; a throttle valve adapted to control pressure drop across the fuel meteri
What is claimed is: 1. A fuel system for a gas turbine engine, the fuel system comprising: a high pressure centrifugal pump adapted to pump fuel from a fuel supply; a fuel metering valve adapted to set a metered flow of fuel; a throttle valve adapted to control pressure drop across the fuel metering valve, the throttle valve having at least two variable orifices and a compensation chamber between the variable orifices, the throttle valve being movable to simultaneously change degrees of opening of the variable orifices, the fuel system when in operation adapted to form a fuel pressure in the compensation chamber that acts upon the throttle valve to control position the throttle valve; and a nozzle outlet passage adapted to convey fuel to the gas turbine engine for discharge and combustion, wherein the high pressure centrifugal pump, the fuel metering valve, the throttle valve and the nozzle outlet passage are arranged in fluidic series. 2. The fuel system of claim 1, wherein the throttle valve includes a differential valve piston slidable in a valve body, the differential valve piston comprising two different diameters to provide differently sized working surfaces across the throttle valve. 3. The fuel system of claim 2, wherein the differential valve piston further comprising first and second lands in spaced relation such that the throttle valve defines at least three chambers, including a first chamber subjected to fluid pressure upstream of the fuel metering valve, a second chamber subjected to fluid pressure downstream of the fuel metering valve, and the compensation chamber intermediate of the two variable orifices, the compensation chamber arranged in fluidic series with the fuel metering valve and the nozzle outlet passage whereby fuel flows through the compensation chamber toward the nozzle outlet passage. 4. The fuel system of claim 1, wherein the variable orifices change in flow area at different rates when the throttle valve moves between a plurality of positions. 5. The fuel system of claim 4, wherein the variable orifices are in series between the fuel metering valve and the nozzle outlet passage to include an upstream variable orifice and a downstream variable orifice, the upstream variable orifice having a larger flow area than the downstream variable orifice during operation of the throttle valve. 6. The fuel system of claim 1, wherein the throttle valve comprises a spring urging the throttle valve to a closed position preventing fuel from flowing to the nozzle outlet passage. 7. The fuel system of claim 6, further comprising a electrically operated valve fluidically connected to receive a high pressure fuel output from the high pressure centrifugal pump during operation, the electrically operated valve having an on position connecting the high pressure fuel output to an actuation chamber in the throttle valve and a off position disconnecting the actuation chamber from the high pressure fuel output and connecting the actuation chamber to a sump or boost pressure, the high pressure fuel output when initially communicated to the actuation chamber via the on position of the electrically operated valve acting upon the throttle valve against the spring to move the throttle valve from the closed position to an open position, the sump or boost pressure when communicated to the actuation chamber via the off position of the electrically operated valve allowing the spring to move the throttle valve from the open position to the closed position. 8. The fuel system of claim 1, wherein the throttle valve is arranged downstream of the fuel metering valve between the fuel metering valve and the nozzle outlet passage. 9. The fuel system of claim 8, wherein the high pressure centrifugal pump is arranged downstream of the fuel metering valve and the throttle valve, wherein the centrifugal pump is a vapor core pump. 10. The fuel system of claim 1, wherein the high pressure centrifugal pump is arranged upstream of the fuel metering valve and the throttle valve. 11. The fuel system of claim 1, wherein the throttle valve is biased by a spring, the spring providing a variable biasing force determined by the position of the throttle valve, wherein the two variable orifices change in flow area when the throttle valve moves when in operation whereby fluid pressure in the compensation chamber is changed in a predetermined manner determined by a selective sizing of ports for the variable orifices, the change in fluid pressure being correlated to changes in the variable biasing force wherein the variable biasing force and the fluid pressure in the compensation chamber generally increase and decrease in unison. 12. The fuel system of claim 11, wherein changes in fluid pressure in the compensation chamber further compensates for fluid forces such as Bernoulli forces generated when fluid flows through the throttle valve. 13. The fuel system of claim 1, further comprising a servo controller positioning the fuel metering valve. 14. The fuel system of claim 1, wherein the nozzle outlet passage leads to a combustion chamber contained in the gas turbine engine. 15. The fuel system of claim 1, wherein the nozzle outlet passage leads to an after-burner of the gas turbine engine. 16. A fuel system for a gas turbine engine, the fuel system comprising: a high pressure centrifugal pump adapted to pump fuel from a fuel supply; a fuel metering valve adapted to set a metered flow of fuel; a throttle valve adapted to control pressure drop across the fuel metering valve, the throttle valve having a valve body, a valve member movable in the valve body, and a spring biasing the valve member, the spring applying a spring force upon the valve member that changes when the valve member moves; means in the throttle valve responding to fuel flow through the throttle valve and for compensating for changes in the spring force as the valve member moves; and a nozzle outlet passage adapted to convey fuel to the gas turbine engine for discharge, wherein the centrifugal pump, the fuel metering valve, the throttle valve and the nozzle outlet passage are arranged in fluidic series. 17. The fuel system of claim 16 wherein the compensating means further compensates for fluid flow forces such as Bernoulli forces generated by fuel flow through the throttle valve. 18. The fuel system of claim 16 wherein the compensating means comprises at least two variable orifices in fluid series. 19. The fuel system of claim 18, wherein the variable orifices change in flow area at different rates when the throttle valve moves between a plurality of positions. 20. The fuel system of claim 19, wherein the variable orifices are in series between the fuel metering valve and the nozzle outlet passage to include an upstream variable orifice and a downstream variable orifice, the upstream variable orifice having a larger flow area than the downstream variable orifice during operation of the throttle valve. 21. The fuel system of claim 17, wherein the compensating means comprises a differential valve piston slidable in a valve body, the differential valve piston comprising two different diameters to provide differently sized working surfaces across the throttle valve. 22. The fuel system of claim 21, wherein the differential valve piston further comprising first and second lands in spaced relation such that the throttle valve defines at least three chambers, including a first chamber subjected to fluid pressure upstream of the fuel metering valve, a second chamber subjected to fluid pressure downstream of the fuel metering valve, and the compensation chamber intermediate of two variable orifices formed by the throttle valve, the compensation chamber arranged in fluidic series with the fuel metering valve and the nozzle outlet passage whereby fuel flows through the compensation chamber toward the nozzle outlet passage. 23. The fuel system of claim 16, wherein the spring urges the throttle valve to a closed position preventing fuel from flowing to the nozzle outlet passage. 24. The fuel system of claim 23, further comprising a electrically operated valve fluidically connected to receive a high pressure fuel output from the high pressure centrifugal pump during operation, the electrically operated valve having an on position connecting the high pressure fuel output to an actuation chamber in the throttle valve and a off position disconnecting the actuation chamber from the high pressure fuel output and connecting the actuation chamber to a sump or boost pressure, the high pressure fuel output when initially communicated to the actuation chamber via the on position of the electrically operated valve acting upon the throttle valve against the spring to move the throttle valve from the closed position to an open position, the sump or boost pressure when communicated to the actuation chamber via the off position of the electrically operated valve allowing the spring to move the throttle valve from the open position to the closed position. 25. The fuel system of claim 16, wherein the throttle valve is arranged downstream of the fuel metering valve between the fuel metering valve and the nozzle outlet passage. 26. The fuel system of claim 16, wherein the high pressure centrifugal pump is arranged downstream of a fuel metering valve and the throttle valve, wherein the centrifugal pump is a vapor core pump. 27. The fuel system of claim 16, wherein the high pressure centrifugal pump is arranged upstream of the fuel metering valve and the throttle valve. 28. The fuel system of claim 16, further comprising a servo controller positioning the fuel metering valve. 29. The fuel system of claim 16, wherein the nozzle outlet passage leads to a combustion chamber contained in the gas turbine engine. 30. The fuel system of claim 16, wherein the nozzle outlet passage leads to an after-burner of the gas turbine engine.
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이 특허에 인용된 특허 (9)
Wernberg Donald E. (Rockford IL), Bypass-type differential pressure regulator.
Rawlinson, Neil; Lyons, Michael Robert; Bradbury, William Keith; Alden, Laurence; Ramsay, Blair; Scully, Mark, Staging valve arrangement and valve for use therein.
Mailander, William James; Goodwin, Paul Bryant, Thermoelectrically cooled components for distributed electronics control system for gas turbine engines.
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