Powerplant
Citation Bravo
Developed for Training Purposes
5L-17
March 2009
Fuel Pump
The accessory-driven (engine-
driven) fuel pump contains a 1st
stage centrifugal boost, and a 2nd
stage spur-gear positive displace-
ment unit. Fuel enters the 1st stage
of the pump through an inlet screen
which, when obstructed, is unseated
by the fuel pressure to allow fuel to
flow past it to the oil cooler. The oil
cooler (fuel-oil heat exchanger) uses
the cold fuel to cool engine oil
before it reaches the engine bearings
and accessory gearbox. Oil and fuel
flow through separate passages
within the cooler where the hot oil
exchanges heat with the cold fuel. A
bypass valve within the cooler
bypasses oil around the passages
should the oil cooler become
obstructed. The fuel, which has been
warmed by the oil circulating
through the cooler, exits the cooler
and enters the fuel filter. If the fuel
filter becomes obstructed, the fuel
filter bypass valve opens to allow
unfiltered fuel to flow around the
obstructed fuel filter element to the
fuel pump 2nd stage.
Depending on engine speed, fuel
exiting the 2nd stage pump is
boosted to 200 to 600 PSI.
Excess fuel from the pump routes to
the fuel pump bypass port. This fuel
returns to the fuel tank.
Hydro-mechanical Fuel
Control Unit
The fuel pump transmits a speed sig-
nal proportional to engine compres-
sor turbine speed (N
2
) to the
governing section of the FCU.
The FCU controls engine N
2
speed
by varying fuel flow to the engine.
The FCU meters fuel for engine
starting, acceleration, governing,
altitude compensation, deceleration,
idle, and shutdown.
The fuel-metering section contains a
mechanically actuated metering
valve. The actions of the metering
valve establish fuel flow to the
engine. The bypass valve routes
excess fuel back to the fuel pump to
maintain a constant fuel pressure dif-
ferential across the metering valve.
The fuel-metering section also uses a
high pressure relief valve to prevent
excess pressure in the FCU by
rerouting fuel back to the fuel pump.
The fuel-computing (air) section
uses an acceleration bellows (Px),
governor bellows (Py), and com-
pressor air (Pc) pressure to regulate
fuel flow. Movement of the bellows
in response to pressure changes con-
trols the position of the metering
valve to regulate fuel flow. During
engine operation, pressures increase
and decrease in response to engine
acceleration and deceleration. As
pressures build, the bellows open the
metering valve to increase fuel flow.
As the engine decelerates, pressures
decrease to close the metering valve.
The action of this section controls
the operation of the metering valve,
which provides efficient fuel sched-
uling for engine operation.
The power input and speed-governing
section uses a flyweight and springs to
operate. This section regulates pres-
sures supplied to the fuel computing
section in response to engine speed
and desired engine speed.
A temperature sensor (T
2
) in the
bypass duct monitors ambient air tem-
perature. The sensor reacts to ambient
air temperature changes by bleeding
off more or less Px air to the FCU.
Flow Divider Valve
After passing through the flow
meter, the fuel enters the fuel flow
divider. A valve in the flow divider
splits the fuel flow into two streams:
one for the Primary Manifold, which
governs initial fuel flow during
Содержание Citation Bravo
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