Jet Engine (Turbojet). Also Has Thrust Reversers. The best known Jet Engine (and also the most commonly used, it is the base of all Jet Engines) [I messed it up while editing] If you want to use parts, feel free to use them (just give credit).
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also, turbo fan jet engines are more common, they're more fuel efficient, therefore used by all of the comercial jets, turbojets are almost exclusively for fighters
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the air flow doesn't look particularly smooth going through there, try removing the jagged edges of the wall using ttan, flowing air doesn't like sharp changes in direction. also make the fuel constant :)