How A Jet Engine Works (Trimmed)

How a jet engine or gas turbine works. Trimmed and taken from: http://youtube.com/watch?v=p1TqwAKwMuM

Category:

Howto & Style

Tags:

• Jet
• engine
• how
• simulation
• gas
• turbine

[pjtc85]

The intake of air is caused by the rotating turbofan, however, what spins the axel in which the fan itself sits on? I get the compression part though. Also, what kind of thrust barings do they use so that the fan or blades don't go hurdling.

[Schmoozer3348]

The exhaust gas drives a smaller prop in the rear connected via the axle. As for the bearings, I don't know, but I would imagine they are custom designed and fabricated for this specific application, not something you can just order from McMaster-Carr.

[kiml42]

That was most enlightening.

[divingisbest]

Thanks. This explained so much to me. 5 stars!

[qwunk12]

@ce4me, think of it like a big gas powerd fan with mulitple layers, each set up in smaller seccesion (sorry spelling is horrible) which the assmbly is called the gas generator, each rotating blade has a compainon vain, which are called stages, the first stage starts of big then gets smaller and smaller, being compressed, then it reaches the combustor section or hot section, it is super heating then rapidly expandes going over whats called the High Pressure turbine, then out the ass.

[666jet]

@ce4me finally a smart question. this video is crap. it is the air trying to escape the front that actually creates the forward thrust. what's missing in this video is the compression chamber which extends forward from the combustion chamber. this is where superheated air is trapped and continuously tries to escape towards the front.

[Jbinkley79]

Thats actually pretty simple compared to a car at least

[ce4me]

The jet is open from front to back. In a stopped jet, if you were to blow smoke in the front it would come out the back. Since the jet is an open tube, why does not the combusted gas blow out the front? If to a stopped jet, if a large amount of compressed air were injected in the middle at the combustion chamber, which way would the air flow, out the back or front.

[ce4me]

The jet is open from front to back. In a stopped jet, if you were to blow smoke in the front it would come out the back. Since the jet is an open tube, why does not the combusted gas blow out the front?

[aakarwas]

@BoltOfThundor Jet engine efficiency is usually measured by the engine's thrust specific fuel consumption TSFC. For turbofans the TSFC is ~0.6-0.7 where as a turbojet's is around 1. TSFC is pounds of fuel per hour per pound of thrust.

Also, to set previous posts straight no combusted air travels through the compressor, that is fresh air only! The hot gases pass through the turbine(s) which spin the compressor/fan/shaft depending on the engine's purpose.

[BoltOfThundor]

@miffballa50 So, how much more affective is a turbofan engine compared to other engines in its efficiency? I mean, they wouldn't use a hybrid time idea unless it was efficient... (first question that pop-ed in-mind)

[chrisbaileyb]

Most of the air that a jet engine intakes is actually used to keep the engine cool ( about 75%) the rest ( 25%) is scheduled by the hydromechanical unit with fuel in the right proportion for combustion. Hydromechanical unit for jet engine is like a carburetor in a car.