Editing Jet propulsion (section)

===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.