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Jet propulsion
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==Types of reaction engine== {{Main|Reaction engine}} Reaction engines produce thrust by expelling solid or fluid [[reaction mass]]; jet propulsion applies only to engines which use fluid reaction mass. ===Jet engine=== {{Main|Jet engine}} A jet engine is a [[reaction engine]] which uses ambient air as the working fluid and converts it to a hot, high-pressure gas which is expanded through one or more [[nozzle]]s. Technically, most jet engines are [[Gas turbine|gas turbines]], working on the [[Brayton cycle|Brayton Cycle]]. Two types of jet engines, the [[turbojet]] and [[turbofan]], employ [[axial-flow compressor|axial-flow]] or [[centrifugal compressor]]s to raise the pressure before [[combustor|combustion]] and [[turbines]] to drive the compression. [[Ramjet]]s operate only at high flight speeds because they omit the compressors and turbines, depending instead on the [[dynamic pressure]] generated by the high speed (known as ram compression). [[Pulse jet engine|Pulse jets]] also omit the compressors and turbines but can generate static thrust and have limited maximum speed. ===Rocket engine=== {{Main|Rocket engine}} The rocket is capable of [[spaceflight|operating in the vacuum of space]] because it is dependent on the vehicle carrying its own [[oxidizer]] instead of using the oxygen in the air, or in the case of a [[nuclear rocket]], heats an inert propellant (such as liquid [[hydrogen]]) by forcing it through a [[nuclear reactor]]. ===Plasma engine=== {{Main|Plasma propulsion engine}} Plasma thrusters accelerate a [[plasma (physics)|plasma]] by [[electromagnetic]] means. ===Pump-jet=== {{Main|Pump-jet}} The pump-jet, used for [[marine propulsion]], uses water as the working fluid, pressurized by a [[ducted propeller]], [[centrifugal pump]], or a combination of the two.
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