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US 7,726,112 B2Granted
Fuel system of gas turbine engines
AssigneePratt & Whitney Canada Corp.
InventorKevin Allan Dooley
Life of this patent
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Abstract
A method for purging fuel from a fuel system of a gas turbine engine on shutdown of the engine comprises, in one aspect, terminating a fuel supply to the fuel system and using the residual compressed air to create a reversed pressure differential in the fuel system relative to a forward pressure differential of the fuel system used to maintain fuel supply for engine operation, and under the reversed pressure differential substantially purging the fuel remaining in the system therefrom to a fuel source.
Claims7
A liquid fuel reverse purge control system for a fuel manifold of a gas turbine engine, the system comprising:
- a fuel manifold in fluidic communication with a compressor stage of the engine;
- a fuel pump for forward pressurizing fuel from a fuel source to the fuel manifold;
- a fluidic connection between the fuel pump and the fuel manifold for controllable delivery of fuel from the fuel source to the fuel manifold, the fluidic connection having a fuel purge passage for reverse purging fuel and a first control valve associated therewith to selectively open and close the fuel purge passage, wherein the fluidic connection comprises an extension of said fluidic connection to a pilot nozzle in a parallel relationship with the fuel manifold;
- and a control unit in controlling contact with the first control valve to open the fuel purge passage on shutdown of the engine, for establishing said reverse fuel purging, under residual compressor air diverted to the fuel manifold to force fuel to flow back from the fuel manifold through the fluidic connection to the fuel source.
1 more element
Dependencies are inferred from the claim text.