Editing Gas turbine (section)

===Jet engines===
[[File:J85 ge 17a turbojet engine.jpg|thumb|typical axial-flow gas turbine turbojet, the [[General Electric J85|J85]], sectioned for display. Flow is left to right, multistage compressor on left, combustion chambers center, two-stage turbine on right]]

Airbreathing [[jet engine]]s are gas turbines optimized to produce thrust from the exhaust gases, or from [[ducted fan]]s connected to the gas turbines.<ref>{{cite tech report |url=https://pure.manchester.ac.uk/ws/files/83828293/Modelling_of_a_Turbojet_Gas_Turbine_Engine.pdf |title=Modelling of a turbojet gas turbine engine |last1=Klein |first1=D. |last2=Abeykoon |first2=C. |publisher=University of Manchester |year=2015}}</ref><ref name = "Dk">{{cite journal|last=Dick |first=Erik |title=Thrust Gas Turbines |journal=Fundamentals of Turbomachines |volume=109 |year=2015}}</ref> Jet engines that produce thrust from the direct impulse of exhaust gases are often called [[turbojet]]s. While still in service with many militaries and civilian operators, turbojets have mostly been phased out in favor of the [[turbofan]] engine due to the turbojet's low fuel efficiency, and high noise.<ref name=":0">{{Cite book |url=https://www.faa.gov/sites/faa.gov/files/regulations_policies/handbooks_manuals/aviation/FAA-H-8083-32-AMT-Powerplant-Vol-1.pdf |title=8083 Aviation Maintenance Technician Handbook–Powerplant Volume 1 |publisher=Federal Aviation Administration |year=2018 |isbn=978-0983865810 |location=USA}}</ref> Those that generate thrust with the addition of a ducted fan are called [[turbofan]]s or (rarely) fan-jets. These engines produce nearly 80% of their thrust by the ducted fan, which can be seen from the front of the engine. They come in two types, [[low-bypass turbofan]] and [[high bypass]], the difference being the amount of air moved by the fan, called "bypass air". These engines offer the benefit of more thrust without extra fuel consumption.<ref name=":0" /><ref name=":1">{{Cite book |title=A&P Powerplant Textbook |publisher=Jeppeson |year=2011 |isbn=978-0884873389 |edition=3rd}}</ref>

Gas turbines are also used in many [[liquid-fuel rocket]]s, where gas turbines are used to power a [[turbopump]] to permit the use of lightweight, low-pressure tanks, reducing the empty weight of the rocket.