Fuel Flashcards

1
Q

Purpose of a fuel system

A

To supply a precise amount of clean vapor free fuel to the combustion section of the engine,
At a pressure and temperature suitable for efficient atomisation/vaporization

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2
Q

Components in fuel sys [8]

A
Lp fuel pump
Fuel cooled, oil cooler
Fuel heater (bleed air)
Lp filter
Hp pump
Hp filter
FCU
P&D valve
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3
Q

2 types Fuel pump

A

Constant displacement

Variable displacement

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4
Q

FCU types [3]

A

Hydromechanical
Hydropneumatic
Electronic

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5
Q

Hydromechanical does..

A

Computing and fuel metering

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6
Q

FCU parameters [4]

A

Power lever position
Engine speed
Compressor inlet temp and pressure
Burner / discharge temp and pressure

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7
Q

Outline P&D valve

A

Pressurises fuel to correct pressure

And dumps fuel on engine shutdown to prevent (hotstarts)

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8
Q

Fuel nozzles types

A

Atomization
- simplex
- duplex
Vaporization

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9
Q

Outline simplex and duplex

A

Simplex is primary nozzle for start up (wider spray)

Duplex two nozzles and has a narrower spray

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