Fuel with Static Air in a Jet engine

In summary, jet engines work by compressing air and injecting fuel, but they only become self-sustaining above a certain speed. This is because the power generated is not enough to run the necessary components at lower speeds. Therefore, the engine needs to be running at at least 20% N2 in order to effectively inject fuel and maintain the necessary speed. Trying to inject fuel with static air while the engine is not running would not provide enough power to sustain the engine and could potentially cause damage.
  • #1
TheBusFlyer
4
0
Good evening,

Today's planes' need bleed air to start. Above a certain speed, igniters fire up and we inject fuel inside the combustor chamber. Why do we need to have the engine running to inject fuel (around 20%N2)? Can we simply not inject fuel with static air (i.e. when engine is not running)? What would happen if I would do so?

Thanks a lot!
 
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  • #2
Jet engines work by compressing the air then injecting fuel. The resulting hot gasses expand rushing out the back turning a turbine that's connected to the compressor at the front.

This process only becomes self sustaining above a certain minimum speed (rpm). Below that speed the power generated isn't enough to run the compressor, fuel and oil pumps and shift the air that is going through the bypass.
 

What is fuel with static air in a jet engine?

Fuel with static air in a jet engine refers to the process of mixing fuel with air at rest before it enters the combustion chamber of the engine. This is different from the conventional method of injecting fuel directly into the combustion chamber.

How does fuel with static air affect the performance of a jet engine?

Fuel with static air can improve the performance of a jet engine in terms of fuel efficiency and emissions. By pre-mixing the fuel with air, it allows for a more efficient and complete combustion process, resulting in less fuel consumption and reduced emissions.

What are the advantages of using fuel with static air in a jet engine?

The main advantage of using fuel with static air is the improved fuel efficiency and reduced emissions. Additionally, it can also lead to a smoother and more stable combustion process, resulting in a more reliable and efficient engine.

Are there any potential drawbacks to using fuel with static air in a jet engine?

One potential drawback of using fuel with static air is the added complexity and cost of incorporating this technology into jet engines. It may also require additional maintenance and monitoring to ensure proper fuel-air mixture and combustion.

How does the process of creating fuel with static air work?

The process of creating fuel with static air involves mixing fuel and air in a separate chamber before it enters the combustion chamber. The air is typically compressed and mixed with the fuel at a specific ratio, and then injected into the combustion chamber for ignition and combustion.

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