Do a jet engine’s turbines actively pull air into the engine once the turbines begin to spin? (Both during the starter motor phase and also during flight at higher speeds)
And does the front half of the engine produce a substantial amount of drag as it is travelling at high speeds? (not including the thrust coming from the back)
If anyone could help it would be much appreciated!
*I’m thinking about axial and turbofan jet engines, but am curious about all types, *apart from pulse jets*
Cheers!
In: 3
Any combustion engine works on 4 basic principles. Suck, squeeze, bang, blow.
Suck: air is drawn into the engine, In this case the first stages, also called fan stages.
Squeeze: through multiple stages the air is compressed using rotor and stator blades as the passage gets smaller.
Bang: in the combustion chamber air and fuel are mixed in a heat resistant basket looking thing that is coated in a ceramic dip and has a bunch of holes to let the air pass through. The heat of the combustion keeps the reaction going continuously, and a bunch of sensors monitor the air/fuel mixture, temp, load, rps, etc.
Blow: the exhaust goes out the combustion chamber through the turbine stages. Those turbine stages act as the driving force for the fan and compressor stages (the rotor can be hollow and in 2 separate pieces allowing the fan and compressor to spin at different speeds). The turbine uses the high enthalpy (a form of molecular kinetic energy) of the exhaust gasses to make them spin. Then lastly the combustion air is then directed out the exhaust, depending on how the jet engine is used, that can be as thrust, or just let out as most of the energy was converted into the rotational kinetic energy of the rotor.
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