Fuel control for gas turbine with continuous pilot flame

Patent · 01 January 1983

OSTI ID:864632

Swick, Robert M ^[1]

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1. Indianapolis, IN

An improved fuel control for a gas turbine engine having a continuous pilot flame and a fuel distribution system including a pump drawing fuel from a source and supplying a line to the main fuel nozzle of the engine, the improvement being a control loop between the pump outlet and the pump inlet to bypass fuel, an electronically controlled throttle valve to restrict flow in the control loop when main nozzle demand exists and to permit substantially unrestricted flow without main nozzle demand, a minimum flow valve in the control loop downstream of the throttle valve to maintain a minimum pressure in the loop ahead of the flow valve, a branch tube from the pilot flame nozzle to the control loop between the throttle valve and the minimum flow valve, an orifice in the branch tube, and a feedback tube from the branch tube downstream of the orifice to the minimum flow valve, the minimum flow valve being operative to maintain a substantially constant pressure differential across the orifice to maintain constant fuel flow to the pilot flame nozzle.

• Assignee: General Motors Corporation (Detroit, MI)
• Patent Number(s): US 4394811
• OSTI ID: 864632
• Country of Publication: United States
• Language: English

Related Subjects

/60/
ahead
branch
bypass
constant
constant pressure
continuous
continuous pilot
control
control loop
controlled
demand
differential
distribution
downstream
drawing
electronically
electronically controlled
engine
exists
feedback
flame
flow
flow valve
fuel
fuel control
fuel distribution
fuel flow
fuel nozzle
gas
gas turbine
improved
improved fuel
improvement
including
inlet
line
loop
main
main fuel
maintain
maintain constant
minimum
minimum pressure
nozzle
operative
orifice
outlet
permit
pilot
pilot flame
pressure
pressure differential
pump
pump inlet
restrict
restrict flow
source
substantially
substantially constant
supplying
throttle
tube
turbine
turbine engine
unrestricted
valve