Turbofan - Revision history

Admin at 15:33, 10 April 2025

2025-04-10T15:33:49Z

Admin at 15:14, 10 April 2025

2025-04-10T15:14:34Z

← Older revision		Revision as of 08:14, 10 April 2025
Line 40:		Line 40:

	=== Bypass ratio ===		=== Bypass ratio ===
	~~{{main\|Bypass ratio}}~~
	The ''bypass ratio (BPR)'' of a turbofan engine is the ratio between the mass flow rate of the bypass stream to the mass flow rate entering the core.<ref>{{Citation \| encyclopedia= Britannica \| title=Bypass ratio \| url = https://www.britannica.com/technology/bypass-ratio}}</ref> A bypass ratio of 6, for example, means that 6 times more air passes through the bypass duct than the amount that passes through the combustion chamber.		The ''bypass ratio (BPR)'' of a turbofan engine is the ratio between the mass flow rate of the bypass stream to the mass flow rate entering the core.<ref>{{Citation \| encyclopedia= Britannica \| title=Bypass ratio \| url = https://www.britannica.com/technology/bypass-ratio}}</ref> A bypass ratio of 6, for example, means that 6 times more air passes through the bypass duct than the amount that passes through the combustion chamber.

Line 144:		Line 143:

	=== Afterburning turbofan ===		=== Afterburning turbofan ===
	~~{{further\|Afterburner}}~~
	[[File:Pratt & Whitney F119.JPEG\|thumb\|[[Pratt & Whitney F119]] afterburning turbofan on test]]		[[File:Pratt & Whitney F119.JPEG\|thumb\|[[Pratt & Whitney F119]] afterburning turbofan on test]]

Line 227:		Line 225:

	===Geared fan===		===Geared fan===
	~~{{main\|Geared turbofan}}~~
	[[File:Geared Turbofan NT.PNG\|thumb\|Geared turbofan. The gearbox is labeled 2.]]		[[File:Geared Turbofan NT.PNG\|thumb\|Geared turbofan. The gearbox is labeled 2.]]

Line 256:		Line 253:

	===Thrust growth===		===Thrust growth===

	Thrust growth is obtained by increasing [[core power]]. There are two basic routes available:		Thrust growth is obtained by increasing [[core power]]. There are two basic routes available:
	# hot route: increase HP turbine rotor inlet temperature		# hot route: increase HP turbine rotor inlet temperature
Line 350:		Line 346:

	==Manufacturers==		==Manufacturers==
	~~{{main\|List of turbofan manufacturers}}~~
	The turbofan engine market is dominated by [[GE Aerospace\|General Electric]], [[Rolls-Royce plc]] and [[Pratt & Whitney]], in order of market share. General Electric and [[Safran Aircraft Engines\|Safran]] of France have a joint venture, [[CFM International]]. Pratt & Whitney also have a joint venture, [[International Aero Engines]] with [[Japanese Aero Engine Corporation]] and [[MTU Aero Engines]] of Germany, specializing in engines for the [[Airbus A320 family]]. Pratt & Whitney and General Electric have a joint venture, [[Engine Alliance]] selling a range of engines for aircraft such as the [[Airbus A380]].		The turbofan engine market is dominated by [[GE Aerospace\|General Electric]], [[Rolls-Royce plc]] and [[Pratt & Whitney]], in order of market share. General Electric and [[Safran Aircraft Engines\|Safran]] of France have a joint venture, [[CFM International]]. Pratt & Whitney also have a joint venture, [[International Aero Engines]] with [[Japanese Aero Engine Corporation]] and [[MTU Aero Engines]] of Germany, specializing in engines for the [[Airbus A320 family]]. Pratt & Whitney and General Electric have a joint venture, [[Engine Alliance]] selling a range of engines for aircraft such as the [[Airbus A380]].

Line 554:		Line 549:

	==External links==		==External links==
	~~{{Commons category\|Turbofan engines}}~~
	*[[Wikibooks:Jet Propulsion\|Wikibooks: Jet propulsion]]		*[[Wikibooks:Jet Propulsion\|Wikibooks: Jet propulsion]]
	* {{cite web \|url= https://www.hq.nasa.gov/office/aero/ebooks/downloads/nasa_innovation_in_aeronautics.pdf \|author= Malcolm Gibson \|work= NASA Innovation in Aeronautics NASA/TM-2011-216987 \|date= Aug 2011 \|title= The Chevron Nozzle: A Novel Approach to Reducing Jet Noise \|access-date= 2017-03-24 \|archive-date= 2020-03-23 \|archive-url= https://web.archive.org/web/20200323200035/https://www.hq.nasa.gov/office/aero/ebooks/downloads/nasa_innovation_in_aeronautics.pdf \|url-status= dead }}		* {{cite web \|url= https://www.hq.nasa.gov/office/aero/ebooks/downloads/nasa_innovation_in_aeronautics.pdf \|author= Malcolm Gibson \|work= NASA Innovation in Aeronautics NASA/TM-2011-216987 \|date= Aug 2011 \|title= The Chevron Nozzle: A Novel Approach to Reducing Jet Noise \|access-date= 2017-03-24 \|archive-date= 2020-03-23 \|archive-url= https://web.archive.org/web/20200323200035/https://www.hq.nasa.gov/office/aero/ebooks/downloads/nasa_innovation_in_aeronautics.pdf \|url-status= dead }}
Line 561:		Line 555:
	* {{cite news \|url= https://leehamnews.com/2017/04/14/bjorns-corner-aircraft-engines-sum/ \|title= Bjorn's Corner: Aircraft engines, sum up \|date= April 14, 2017 \|work= Leeham Co \|author= Bjorn Fehrm}} and previous series		* {{cite news \|url= https://leehamnews.com/2017/04/14/bjorns-corner-aircraft-engines-sum/ \|title= Bjorn's Corner: Aircraft engines, sum up \|date= April 14, 2017 \|work= Leeham Co \|author= Bjorn Fehrm}} and previous series

	~~{{Aircraft gas turbine engine components}}~~
	~~{{Heat engines\|state=uncollapsed}}~~

	[[Category:Gas turbines]]		[[Category:Gas turbines]]
	[[Category:Jet engines]]		[[Category:Jet engines]]
	[[Category:Turbofan engines\| ]]		[[Category:Turbofan engines\| ]]

Admin at 15:09, 10 April 2025

2025-04-10T15:09:22Z

← Older revision		Revision as of 08:09, 10 April 2025
Line 154:		Line 154:

	=== High-bypass turbofan ===		=== High-bypass turbofan ===
	~~{{More citations needed section\|date=December 2024}}~~
	~~{{further\|Bypass ratio}}~~
	<!-- Old non-animated image.....[[File:tfan-schematic-kk-20090106.png\|thumb\|Schematic diagram illustrating a modern 2-spool, high-bypass turbofan engine in nacelle with an unmixed exhaust. The low-pressure spool is colored blue and the high-pressure one orange.]] -->		<!-- Old non-animated image.....[[File:tfan-schematic-kk-20090106.png\|thumb\|Schematic diagram illustrating a modern 2-spool, high-bypass turbofan engine in nacelle with an unmixed exhaust. The low-pressure spool is colored blue and the high-pressure one orange.]] -->

Admin at 15:07, 10 April 2025

2025-04-10T15:07:43Z

← Older revision		Revision as of 08:07, 10 April 2025
Line 15:		Line 15:
	\|9=Fan nozzle		\|9=Fan nozzle
	}}]]		}}]]
	~~{{Seriesbox aircraft propulsion}}~~

	A '''turbofan''' or '''fanjet''' is a type of [[airbreathing jet engine]] that is widely used in [[aircraft engine\|aircraft propulsion]]. The word "turbofan" is a combination of references to the preceding generation engine technology of the [[turbojet]] and the additional fan stage. It consists of a [[gas turbine engine]] which achieves [[mechanical energy]] from combustion,<ref name=stuffworks>{{cite web\|url= http://science.howstuffworks.com/turbine.htm \|title= How Gas Turbine Engines Work \|publisher= howstuffworks.com \|author= Marshall Brain \|date= April 2000 \|access-date=2010-11-24}}</ref> and a [[ducted fan]] that uses the mechanical energy from the gas turbine to force air rearwards. Thus, whereas all the air taken in by a [[turbojet]] passes through the [[combustion chamber]] and turbines, in a turbofan some of that air bypasses these components. A turbofan thus can be thought of as a turbojet being used to drive a ducted fan, with both of these contributing to the [[thrust]].		A '''turbofan''' or '''fanjet''' is a type of [[airbreathing jet engine]] that is widely used in [[aircraft engine\|aircraft propulsion]]. The word "turbofan" is a combination of references to the preceding generation engine technology of the [[turbojet]] and the additional fan stage. It consists of a [[gas turbine engine]] which achieves [[mechanical energy]] from combustion,<ref name=stuffworks>{{cite web\|url= http://science.howstuffworks.com/turbine.htm \|title= How Gas Turbine Engines Work \|publisher= howstuffworks.com \|author= Marshall Brain \|date= April 2000 \|access-date=2010-11-24}}</ref> and a [[ducted fan]] that uses the mechanical energy from the gas turbine to force air rearwards. Thus, whereas all the air taken in by a [[turbojet]] passes through the [[combustion chamber]] and turbines, in a turbofan some of that air bypasses these components. A turbofan thus can be thought of as a turbojet being used to drive a ducted fan, with both of these contributing to the [[thrust]].

Admin at 15:04, 10 April 2025

2025-04-10T15:04:16Z

← Older revision		Revision as of 08:04, 10 April 2025
Line 1:		Line 1:
	~~{{About\|the mechanism used in jets\|the turbo like air pressure blower sometimes misnamed Turbo fan\|Centrifugal fan}}~~
	[[File:Turbofan3 Labelled.gif\|thumb\|360px\|alt=Animation of turbofan, which shows flow of air and the spinning of blades.\|Animation of a 2-spool, high-bypass turbofan {{ordered list		[[File:Turbofan3 Labelled.gif\|thumb\|360px\|alt=Animation of turbofan, which shows flow of air and the spinning of blades.\|Animation of a 2-spool, high-bypass turbofan {{ordered list
	\|list_style_type=upper-alpha		\|list_style_type=upper-alpha

Admin at 15:02, 10 April 2025

2025-04-10T15:02:12Z

← Older revision		Revision as of 08:02, 10 April 2025
Line 1:		Line 1:
	~~{{distinguish\|propfan\|turboprop}}~~
	{{About\|the mechanism used in jets\|the turbo like air pressure blower sometimes misnamed Turbo fan\|Centrifugal fan}}		{{About\|the mechanism used in jets\|the turbo like air pressure blower sometimes misnamed Turbo fan\|Centrifugal fan}}
	[[File:Turbofan3 Labelled.gif\|thumb\|360px\|alt=Animation of turbofan, which shows flow of air and the spinning of blades.\|Animation of a 2-spool, high-bypass turbofan {{ordered list		[[File:Turbofan3 Labelled.gif\|thumb\|360px\|alt=Animation of turbofan, which shows flow of air and the spinning of blades.\|Animation of a 2-spool, high-bypass turbofan {{ordered list

Admin at 15:00, 10 April 2025

2025-04-10T15:00:12Z

← Older revision		Revision as of 08:00, 10 April 2025
Line 1:		Line 1:
	~~{{short description\|Airbreathing jet engine designed to provide thrust by driving a fan}}~~
	{{distinguish\|propfan\|turboprop}}		{{distinguish\|propfan\|turboprop}}
	{{About\|the mechanism used in jets\|the turbo like air pressure blower sometimes misnamed Turbo fan\|Centrifugal fan}}		{{About\|the mechanism used in jets\|the turbo like air pressure blower sometimes misnamed Turbo fan\|Centrifugal fan}}

Admin: 1 revision imported

2025-04-10T14:57:03Z

1 revision imported

← Older revision	Revision as of 07:57, 10 April 2025
(No difference)

wikipedia>EducatedRedneck: MOS:OL; ducted fan is wikilinked in the next sentence. No need to link generic fans here. Undid revision 1274963988 by 116.206.254.123 (talk)

2025-02-10T10:20:29Z

MOS:OL; ducted fan is wikilinked in the next sentence. No need to link generic fans here. Undid revision 1274963988 by 116.206.254.123 (talk)

Show changes

← Older revision		Revision as of 08:02, 10 April 2025
Line 1:		Line 1:
	~~{{distinguish\|propfan\|turboprop}}~~
	{{About\|the mechanism used in jets\|the turbo like air pressure blower sometimes misnamed Turbo fan\|Centrifugal fan}}		{{About\|the mechanism used in jets\|the turbo like air pressure blower sometimes misnamed Turbo fan\|Centrifugal fan}}
	[[File:Turbofan3 Labelled.gif\|thumb\|360px\|alt=Animation of turbofan, which shows flow of air and the spinning of blades.\|Animation of a 2-spool, high-bypass turbofan {{ordered list		[[File:Turbofan3 Labelled.gif\|thumb\|360px\|alt=Animation of turbofan, which shows flow of air and the spinning of blades.\|Animation of a 2-spool, high-bypass turbofan {{ordered list

← Older revision		Revision as of 08:00, 10 April 2025
Line 1:		Line 1:
	~~{{short description\|Airbreathing jet engine designed to provide thrust by driving a fan}}~~
	{{distinguish\|propfan\|turboprop}}		{{distinguish\|propfan\|turboprop}}
	{{About\|the mechanism used in jets\|the turbo like air pressure blower sometimes misnamed Turbo fan\|Centrifugal fan}}		{{About\|the mechanism used in jets\|the turbo like air pressure blower sometimes misnamed Turbo fan\|Centrifugal fan}}