How do jet engines work?

In: Inventions, Airplanes and Aircraft

The simple answer is: "Suck, Squeeze, Burn and Blow." Or, more accurately, air is taken into the inlet of a jet engine (suck) and then compressed (squeeze) by a series of rotors and stators. A fuel mixture is then injected into a chamber with the compressed air and ignited (burn). The subsequent combustion is directed aft and the resulting exaust (blow) pushes the engine (and vehicle) forward. The exhaust gasses also turn a shaft connected to the inlet turbine which continues the compression process. It's really a lot more complicated than this, but this is the quick and dirty of how it works.

Very good answer

A modern jet engine is made up of several rows of spinning propeller blades called Rotors. As the airflow goes through each row, the air is accelearted and compressed. Behind the row is another set of blades that are not really turning---but attached to the out housing. These are called Stators. These help to re-direct the flow to be more effecient and prepare it to meet the next set of spinning blades. After going through several rows of Rotors, the air is compressed. This stage of the engine is called the Compressor.

The compressed gas enters a Combustion Chamber where fuel is added an a spark ignites the fuel/air mixture and this flame is self-sustaining. The hot gases want to expand and it passes through another set of Rotors and Stators that extract some energy out of the fast flowing air gases. This section of the engine is the Turbine stage because it acts like the turbines in a dam to pull energy out of flowing fluid. This engergy is used to turn the Turbine disc that is connected back to the Compressor stage, thus compressing the next amount of air entering the engine.

The gas escaping the engine has a great amount of energy and velocity and applies thrust to the engine and thus to the airplane.

Just one more thing to add!

Hi bypass commercial jets (Trent 900, GEnx) use outer guide vanes or OGV's to rotate and eject air before the compressor stage. The air rotates around the exhaust to reduce friction of exhaust gases increasing efficency and reducing noise.

First answer by Joepoidog. Last edit by 620Steve83. Contributor trust: 0 [recommend contributor]. Question popularity: 29 [recommend question]

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