Fuel Systems BGT Function and Purpose

Question 1

What is the purpose of the fuel systems? (2)

How is this achieved?

Answer 1

• Provide the engine with fuel for combustion.
• Control the flow to the required quantity necessary for:
• Easy starting.
• Acceleration.
• Stable running at all conditions.
• To do this, one or more fuel pumps are used to deliver the fuel to the fuel spray nozzles.
• This injects it into the combustion system in the form of an atomised spray.

Question 2

How is the power of an engine controlled for the fuel systems?
How is this achieved?

Answer 2

• The flow rates vary according to the amount of air passing through the engine to maintain a constant selected engine speed or pressure.
• The controlling devices are fully automatic, except engine power selection which is achieved by a manual throttle or power lever.
• To achieve the above, turbines are equipped with an FCU, which supplies fuel to the nozzles.