Method and system for failure accommodation of gas generator fuel metering system

摘要

An apparatus for providing a backup fuel metering system for the gas generator section ( 24 ) of a gas turbine engine ( 10 ) is disclosed that includes a gas generator ( 24 ) and an augmentor ( 40 ). The apparatus includes a gas generator fuel metering system ( 52 ) providing fuel to the gas generator nozzles ( 32 ) and an augmentor fuel metering system ( 54 ) providing fuel to an augmentor ( 40 ). The augmentor fuel system ( 54 ) includes a diverter valve ( 88 ) which selectably directs fuel to the augmentor ( 40 ) during augmentation operation or to the gas generator nozzles ( 32 ) during a gas generator metering system failure or critical engine operation. The system allows the gas generator nozzles ( 32 ) to be supplied with fuel flow from the gas generator metering system ( 52 ), the augmentor metering ( 54 ) system or both. When the gas generator nozzles ( 32 ) are being supplied with flow from both metering systems the system is capable of improved fault accommodation.