Fuel system for a gas turbine engine
AssigneeWoodward Governor Company
InventorsDmitriy Baryshnikov, Douglas P. Smith
Life of this patent
Estimating the term…
Abstract
A system for automatically transferring the fuel from one or more engine fuel manifolds directly to the engine fuel tank(s) during engine shutdown using an ejector pump has been presented. A checkvalve, which may be integrated with the ejector pump, is also used. A metering valve initiates fuel flow shutoff and is used in the draining of the fuel manifolds, thereby eliminating the need for an additional solenoid dedicated mainly to the shutoff function. The shutoff and pressurizing valve provides flow division between manifolds and manifold drain for systems having multiple manifolds. The bypass valve is used to turn the motive flow and/or manifold drain functions on and off as a function of engine speed at start and shutdown.
Claims11
A system for transferring fuel from at least one engine fuel manifold of a gas turbine engine to a fuel tank comprising:
- a fuel metering and shutoff valve configured to provide high pressure fuel to the at least one engine fuel manifold;
- a bypass valve in fluid communication with the fuel metering and shutoff valve;
- an ejector having an inlet port for receiving fuel from the bypass valve during engine operation, an outlet port in fluid communication with one of the fuel tank and a fuel tank ejector, and a suction port, the ejector defining a nozzle extending between the inlet port and the outlet port for increasing the velocity of high pressure fuel flowing therethrough so as to create suction at the suction port;
- a checkvalve in fluid communication with a drain port of a manifold drain valve and one of the suction port and the inlet port, the manifold drain valve having an inlet port in fluid communication with an output port of the fuel metering and shut off valve, at least one manifold port in fluid communication with the at least one engine fuel manifold, a port connected to the checkvalve, and the drain port, the manifold drain valve configured to connect the at least one manifold port to the high pressure fuel during engine operation and to the drain port when the metering valve and shutoff valve inlet port is switched to low pressure.
Dependencies are inferred from the claim text.