Fuel control for a gas turbine engine reheat system
AssigneeLucas Industries Limited
InventorTrevor S. Smith
Life of this patent
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Abstract
A fuel control for a gas turbine engine reheat system has a plurality of metering valves operated by an electrical control circuit for regulating fuel flow from a pump to respective burners of the reheat system. The pump has an inlet throttle which is also operated by the control circuit so that pump delivery is substantially equal to the sum of the detected fuel flows through the metering valves. The value of a measured pressure drop across one metering valve is compared with a desired value of that pressure drop, and a difference between these values is used to adjust the control signal to the pump inlet throttle, and thereby render the pump delivery more nearly equal to the aforesaid total flow.
Claims6
A fuel control for a gas turbine engine reheat system having a plurality of burners, the fuel control system comprising a plurality of metering valves for controlling fuel flow to the respective burners of the reheat system, a plurality of means for varying the effective flow areas of the respective valves, a plurality of means for detecting the pressure differentials across the respective valves, means responsive to the aforesaid detected pressure differentials, for determing the fuel flows through the respective valves, a fuel pump having an inlet throttle, means for generating a first control signal proportional to the sum of the determined fuel flows, means for generating a second control signal dependent on a pressure differential across one of said metering valves, and means responsive to said first and second control signals for controlling said pump inlet throttle.
Dependencies are inferred from the claim text.