Gas turbine engine fuel metering system

Details Gas turbine engine fuel metering system Gas turbine engine fuel metering system

1974-12-20

1977-01-25

Gordon, Clarence R.

Power plants

Combustion products used as motive fluid

Combined with regulation of power output feature

417 15, 417 17, F02C 906

Patent

active

040044122

ABSTRACT:
A fuel control system has a positive displacement gear pump for supplying a metered fuel flow to a gas turbine engine. A variable speed drive mechanism, as constituted by a hysteresis type of electro-magnetic clutch driven by the engine, is operatively connected to the pump for varying the speed of the pump in accordance with a commanded pump speed signal. A scheduling device, which senses various engine parameters, generates a signal indicative of a scheduled fuel flow. The fuel flow signal is, in turn, applied to a function generator which supplies the commanded pump speed signal in accordance with a predetermined relationship between pump speed and fuel flow for the engine sought to be controlled. The relationship between pump speed and fuel flow may be calculated for a wide range of flight conditions since the pressure rise or head across the pump is basically a function of fuel flow. This arrangement obviates the use of a head regulator for highly accurate fuel metering.

REFERENCES:
patent: 3128603 (1964-04-01), Haigh
patent: 3240013 (1966-03-01), Spath
patent: 3478512 (1969-11-01), Brahm
patent: 3596467 (1971-08-01), Avery
patent: 3832846 (1974-09-01), Leeson

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