Additive injection system for improving thermal stability of jet fuel
First Claim
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1. A gas turbine engine fuel system comprising:
- a fuel tank on an aircraft for storing fuel;
a heat exchanger through which the fuel from the fuel tank can pass;
a fuel pump located downstream from the heat exchanger for pumping the fuel;
a fuel metering unit for metering the fuel pumped by the fuel pump;
an additive tank on the aircraft for storing a fuel additive, wherein the fuel additive comprises a fuel stabilizer for reducing fuel coking;
an additive delivery subsystem for mixing the fuel additive with the fuel at or before the heat exchanger at a location on the aircraft downstream from the fuel tank to generate a fuel and fuel additive mixture; and
a combustor located downstream of the fuel metering unit where the fuel and fuel additive mixture is delivered for combustion.
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Abstract
A gas turbine engine fuel system includes a fuel tank for storing fuel, a heat exchanger through which the fuel from the fuel tank can pass, a fuel pump located downstream from the heat exchanger for pumping the fuel, a fuel metering unit for metering the fuel pumped by the fuel pump, an additive tank for storing a fuel additive, an additive delivery subsystem for mixing the fuel additive with the fuel at or before the heat exchanger to generate a fuel and fuel additive mixture, and a combustor located downstream of the fuel metering unit where the fuel and fuel additive mixture is delivered for combustion. The fuel additive comprises a fuel stabilizer for reducing fuel coking.
20 Citations
20 Claims
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1. A gas turbine engine fuel system comprising:
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a fuel tank on an aircraft for storing fuel; a heat exchanger through which the fuel from the fuel tank can pass; a fuel pump located downstream from the heat exchanger for pumping the fuel; a fuel metering unit for metering the fuel pumped by the fuel pump; an additive tank on the aircraft for storing a fuel additive, wherein the fuel additive comprises a fuel stabilizer for reducing fuel coking; an additive delivery subsystem for mixing the fuel additive with the fuel at or before the heat exchanger at a location on the aircraft downstream from the fuel tank to generate a fuel and fuel additive mixture; and a combustor located downstream of the fuel metering unit where the fuel and fuel additive mixture is delivered for combustion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 20)
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10. A method of fuel delivery for a gas turbine engine, the method comprising:
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providing jet fuel on an aircraft; transferring thermal energy to the jet fuel from oil using a fuel/oil heat exchanger; pumping the jet fuel toward a combustor using a fuel pump; metering the jet fuel downstream of the fuel pump to control a jet fuel delivery rate; providing a fuel additive on the aircraft that comprises a fuel stabilizer to reduce fuel coking at elevated operating temperatures; mixing the fuel additive to the jet fuel at or before the heat exchanger at a location on the aircraft downstream from a jet fuel storage tank; and delivering a mixture of the fuel additive and the jet fuel to the combustor. - View Dependent Claims (11, 12, 13)
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14. An aircraft fuel system comprising:
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a fuel tank on the aircraft for storing fuel; a fuel/oil heat exchanger through which the fuel from the fuel tank can pass, wherein the fuel/oil heat exchanger is configured to transfer thermal energy from oil to the fuel; a positive displacement fuel pump located downstream from the heat exchanger for pumping the fuel; a fuel metering unit for metering the fuel pumped by the fuel pump; an additive tank on the aircraft for storing a fuel additive, wherein the fuel additive comprises a fuel stabilizer for reducing fuel coking at elevated operating temperatures; an additive delivery subsystem for mixing the fuel additive with the fuel at or before the heat exchanger and downstream from the fuel tank to generate a fuel and fuel additive mixture; and a combustor located downstream of the fuel metering unit where the fuel and fuel additive mixture is delivered for combustion. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification