1. Ignition:
* Starter Motor: This electric motor spins the compressor, which is the heart of the engine.
* Igniter: A spark plug or similar device provides an initial spark to ignite the fuel-air mixture.
2. Fuel Injection:
* Fuel Pump: Delivers fuel to the combustion chamber.
* Fuel Nozzles: Atomize the fuel for better mixing with air.
3. Compression:
* Compressor: This rotating assembly draws in air and compresses it, increasing its pressure and temperature.
4. Combustion:
* Combustion Chamber: The compressed air mixes with fuel and ignites, generating hot, expanding gases.
5. Expansion and Thrust:
* Turbine: The expanding gases drive the turbine blades, which are connected to the compressor shaft. This turbine power keeps the compressor spinning.
* Nozzle: The hot gases are channeled through a nozzle, accelerating them and generating thrust.
The process in detail:
1. Pre-start Checks: Before starting, critical systems are checked, such as fuel levels, hydraulic pressure, and electrical systems.
2. Bleed Air: The engine is "bled" with air to remove any residual fuel and ensure proper operation.
3. Starter Motor Engagement: The starter motor is activated to spin the compressor.
4. Fuel Injection: As the compressor spins, fuel is injected into the combustion chamber.
5. Ignition: The igniter creates a spark, igniting the fuel-air mixture.
6. Light-Up: The engine starts to produce a small amount of thrust, known as "light-up."
7. Acceleration: The fuel flow is increased, and the engine accelerates to its operating speed.
8. Takeoff Power: The throttle is advanced to provide full power for takeoff.
Variations:
* Electric Start: Some engines use an electric starter motor to spin the compressor.
* Air Start: Large engines might use compressed air from an external source to start the compressor.
Important Note: Starting a jet engine is a complex process with various safety measures and procedures. It requires specialized training and expertise.
