GB1456976A - Fuel control system for a gas turbine engine reheat system - Google Patents

Abstract

1456976 Centrifugal pumps: gas turbine jet engines re-heat control LUCAS INDUSTRIES Ltd 21 Feb 1974 [19 March 1973] 12043/73 Headings F1C and F1J [Also in Division C3] A control system for each of a plurality of valves controlling the supply of fuel to an associated burner in the re-heat stage of a gas turbine engine is controlled by an electronic control circuit which operates the valve actuators in accordance with a required schedule. Each valve is associated with a position transducer and a differential pressure transducer so that the flow through the valve can be computed. In the arrangement shown the fuel valves 13, 14, 15 are operated by stepper motors 28, 29, 30 under the control of signals from digital control circuit 37 which accepts inputs A-F from the respective valve position and pressure transducers. Additionally a demand input 39 is provided together with various pressure and temperature signal from areas within engine 38. The output flow of the fuel supply pump 10 is controlled by valve 46 in accordance with the inlet and outlet pressures across the valves, with the latter taken through non-return valves 47 from the individual burner supply conduits 40, 41, 42 so that flow is increased when the valve output pressure rises. In a modification a pressure drop valve is connected between the pump outlet and one end of valve 46, Fig. 2 (not shown).