High efficiency, high pressure gas turbine engine fuel supply system

摘要

A gas turbine engine fuel supply system includes a primary gear pump and a secondary gear pump. The primary gear pump always actively delivers fuel to the downstream fuel system, and is sized to supply 100% of the burn flow needed at a select low demand condition. The secondary gear pump is sized to make up the remainder of the flow at high demand conditions, and actively delivers fuel to the downstream fuel system only during those conditions. To supply discharge fuel pressures in excess of gear pump capability, a supercharger pump is disposed upstream of the primary and secondary gear pumps. The supercharger pump is preferably activated only during high demand conditions as an additional energy conservation measure.

主权项

1. A gas turbine engine fuel supply system, comprising:
a boost pump having a boost pump inlet and a boost pump outlet, the boost pump adapted to receive a drive torque and configured, upon receipt thereof, to draw fuel into the boost pump inlet and discharge the fuel from the boost pump outlet; a primary gear pump having a primary gear pump inlet and a primary gear pump outlet, the primary gear pump adapted to receive a drive torque and configured, upon receipt thereof, to draw fuel into the primary gear pump inlet and discharge the fuel from the primary gear pump outlet; a secondary gear pump having a secondary gear pump inlet and a secondary gear pump outlet, the secondary gear pump adapted to receive a drive torque and configured, upon receipt thereof, to draw fuel into the secondary gear pump inlet and discharge the fuel from the secondary gear pump outlet; a supercharger pump having a supercharger pump inlet and a supercharger pump outlet, the supercharger pump adapted to receive a drive torque and configured, upon receipt thereof, to draw fuel into the supercharger pump inlet and discharge the fuel from the supercharger pump outlet; and a pump control valve in fluid communication with the boost pump, primary gear pump, the secondary gear pump, and the supercharger pump, and movable between a first position and a second position, wherein:
in the first position, the pump control valve (i) fluidly isolates the supercharger pump from the boost pump, the primary gear pump, and the secondary gear pump and (ii) fluidly isolates the primary gear pump outlet from the secondary gear pump outlet,in the second position, the pump control valve fluidly communicates the supercharger pump inlet with the boost pump outlet, fluidly communicates the supercharger pump outlet with the primary gear pump inlet and the secondary gear pump inlet, and fluidly communicates the primary gear pump outlet and the secondary gear pump outlet.