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!
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>Do a jet engine’s turbines actively pull air into the engine once the turbines begin to spin?
Yes, there are alternating stages of rotating compressor blades and fixed stator blades, which increase pressure. This high pressure air is then heated further by burning fuel, expanded through nozzles to turn that heat and pressure back into speed, and then that speed is captured by the spinning blades in the turbine, turning it into mechanical energy that rotates the compressor and fan.
>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)
Not as much as you’d expect. Most of the thrust comes from the fan blades forcing air through the bypass duct. When you look at an engine from the front you see a wall of blades, but the air flowing through the engine sees those blades edge on. Though it is a lot of drag if the engines aren’t running.
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