Method and device for feeding a turbomachine combustion chamber with a regulated flow of fuel
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02C-007/20
F02C-006/00
F02C-009/38
F02C-007/232
F02C-009/26
출원번호
US-0318036
(2010-04-15)
등록번호
US-9091217
(2015-07-28)
우선권정보
FR-09 52828 (2009-04-29)
국제출원번호
PCT/FR2010/050722
(2010-04-15)
§371/§102 date
20111028
(20111028)
국제공개번호
WO2010/125273
(2010-11-04)
발명자
/ 주소
Hodinot, Laurent Gilbert Yves
Issert, Celine Marie Anne
Marly, Pascal Laurent
출원인 / 주소
SNECMA
대리인 / 주소
Oblon, McClelland, Maier & Neustadt, L.L.P.
인용정보
피인용 횟수 :
2인용 특허 :
7
초록▼
High-pressure fuel is supplied at a controlled rate to a combustion chamber via a position-controlled valve and a variable-restriction stop-and-pressurizing cut-off valve. A value representative of the real mass flow rate of fuel as delivered is calculated by a calculation unit on the basis of infor
High-pressure fuel is supplied at a controlled rate to a combustion chamber via a position-controlled valve and a variable-restriction stop-and-pressurizing cut-off valve. A value representative of the real mass flow rate of fuel as delivered is calculated by a calculation unit on the basis of information representative of the pressure difference between the inlet and the outlet of the cut-off valve and of the flow section through the cut-off valve, e.g. as represented by the position X of the slide of the cut-off valve. The position-controlled valve has a variable position that is controlled by the calculation unit as a function of the difference between the calculated value representative of the real mass flow rate and a value representative of a desired mass flow rate.
대표청구항▼
1. A method of feeding a turbomachine combustion chamber with fuel at a regulated flow rate, the method comprising: supplying high-pressure fuel by a high-pressure pump receiving the fuel from a low-pressure fuel circuit; using a flow rate regulation unit connected to an outlet from the high-pressur
1. A method of feeding a turbomachine combustion chamber with fuel at a regulated flow rate, the method comprising: supplying high-pressure fuel by a high-pressure pump receiving the fuel from a low-pressure fuel circuit; using a flow rate regulation unit connected to an outlet from the high-pressure pump to supply high-pressure fuel at a controlled rate via a position-controlled valve and a variable-restriction stop-and-pressurizing cut-off valve, an outlet of the position-controlled valve being in fluid communication with an inlet of the variable-restriction stop-and-pressurizing cut-off valve; calculating a value representative of real mass flow rate of the fuel supplied to the combustion chamber by a calculation unit on the basis of information representative of the pressure difference between the inlet and an outlet of the variable-restriction stop-and-pressurizing cut-off valve and of a flow section therethrough; and controlling a position of the position-controlled valve by the calculation unit as a function of the difference between the calculated value representative of the real mass flow rate and a value that is representative of a desired mass flow rate. 2. A method according to claim 1, wherein the value representative of the real mass flow rate Wf is calculated in application of the formula: Wf=K√{square root over (ρ·ΔP)}wherein K is a coefficient of value that is a function of the flow section through the variable-restriction stop-and-pressurizing cut-off valve, ρ is the density of the fuel passing through the variable-restriction stop-and-pressurizing cut-off valve, and ΔP is the pressure difference between the inlet and the outlet thereof. 3. A method according to claim 2, wherein the information representative of the flow section through the variable-restriction stop-and-pressurizing cut-off valve is provided by detecting the position X of a slide thereof. 4. A method according to claim 3, wherein information representative of the temperature T of the fuel passing through the variable-restriction stop-and-pressurizing cut-off valve is supplied to the calculation unit, and the value of K is determined as a function of the position X and of the temperature T. 5. A method according to claim 4, wherein the density ρ of the fuel is evaluated as a function of the temperature T and of a type of fuel used. 6. A method according to claim 2, wherein a density meter is used to provide the calculation unit with information representative of the density of the fuel passing through the variable-restriction stop-and-pressurizing cut-off valve. 7. A method according to claim 6, wherein the density meter also provides information representative of the temperature T of the fuel passing through the variable-restriction stop-and-pressurizing cut-off valve. 8. A method according to claim 3, wherein the position X of the slide of the variable-restriction stop-and-pressurizing cut-off valve is provided by a position sensor associated with a rod secured to the slide, and the rod is made of a material that is selected to have a coefficient of thermal expansion such that an influence of temperature on the density of the fuel passing through the variable-restriction stop-and-pressurizing cut-off valve is substantially compensated by the influence of temperature on the position of the slide determining the flow section through the variable-restriction stop-and-pressurizing cut-off valve. 9. A method according to claim 2, wherein a setpoint position for the variable-restriction stop-and-pressurizing cut-off valve is determined by the calculation unit as a function of the difference between the values representative of the real mass flow rate of the fuel and the desired mass flow rate, and information representative of the real position of the position-controlled valve is supplied to the calculation unit to servo-control the real position to the determined setpoint position. 10. A method according to claim 2, wherein fuel feed cut-off is implemented by causing the position-controlled valve to occupy a position in which substantially all of the fuel received from the high-pressure pump is returned to the low-pressure fuel circuit. 11. A method according to claim 2, wherein the position-controlled valve includes a spring that acts on starting to define a pressurization threshold enabling the fuel to be used as a servo-control hydraulic fluid, the pressurization threshold being lower than the pressure for opening the stop-and-pressurizing cut-off valve. 12. A device for feeding a turbomachine combustion chamber with fuel at a regulated flow rate, the device comprising: a high-pressure pump configured to receive, at an inlet, fuel from a low-pressure fuel circuit and for delivering high-pressure fuel at an outlet; a flow rate regulation unit connected to the outlet from the high-pressure pump and including a position-controlled bypass valve; and a variable-restriction stop-and-pressurizing cut-off valve that is arranged to pass the high-pressure fuel flow for supplying to the combustion chamber, an outlet of the position-controlled valve being in fluid communication with an inlet of the variable-restriction stop-and-pressurizing cut-off valve; wherein the variable-restriction stop-and-pressurizing cut-off valve is associated with a sensor connected to the inlet and the outlet of the variable-restriction stop-and-pressurizing cut-off valve, the sensor is configured to provide information representative of pressure difference between the inlet and an outlet thereof, and information representative of a position of a moving slide thereof that determines a flow section therethrough; and a calculation unit connected to the sensor is configured to calculate a value representative of a real mass flow rate of fuel passing through the variable-restriction stop-and-pressurizing cut-off valve based on the information representative of the pressure difference between the inlet and the outlet thereof, and of the position of the slide, and to control a position of the position-controlled valve as a function of the difference between the real mass flow rate and a setpoint mass flow rate. 13. A device according to claim 12, further comprising a sensor configured to provide the calculation unit with information representative of the temperature of the fuel passing through the variable-restriction stop-and-pressurizing cut-off valve. 14. A device according to claim 12, further comprising a density meter configured to provide the calculation unit with information representative of the density of the fuel passing through the variable-restriction stop-and-pressurizing cut-off valve. 15. A device according to claim 12, wherein the slide of the variable-restriction stop-and-pressurizing cut-off valve includes a rod co-operating with the position sensor and made of a material that presents a coefficient of thermal expansion that is configured to substantially compensate influence of temperature on the density of the fuel passing through the variable-restriction stop-and-pressurizing cut-off valve. 16. A device according to claim 12, wherein a position sensor is associated with the position-controlled valve to provide the calculation unit with information representative of the real position of the position-controlled valve, and the calculation unit is configured to servo-control the real position of the position-controlled valve to a setpoint position that is calculated as a function of the difference between the real and desired mass flow rate. 17. A device according to claim 12, wherein the position-controlled valve is controlled by an electric motor. 18. A device according to claim 12, wherein the position-controlled valve includes a spring defining a minimum pressurization threshold for the fuel that is lower than the opening pressure of the variable-restriction stop-and-pressurizing cut-off valve. 19. A device according to claim 12, further comprising a data recording medium having information stored thereon representative of particular characteristic functions of components of the device and configured to be read by the calculation unit. 20. A device according to claim 12, wherein the calculation unit is incorporated in an electronic regulation unit of the turbomachine or is a dedicated local calculation unit having information stored therein representative of particular characteristic functions of components of the device.
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