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- Turbofan abstract "The turbofan or fanjet is a type of airbreathing jet engine that is widely used in aircraft propulsion. The word "turbofan" is a portmanteau of "turbine" and "fan": the turbo portion refers to a gas turbine engine which takes mechanical energy from combustion, and the fan, a ducted fan that uses the mechanical energy from the gas turbine to accelerate air rearwards. Thus, whereas all the air taken in by a turbojet passes through the turbine (through the combustion chamber), in a turbofan some of that air bypasses the turbine. A turbofan thus can be thought of as a turbojet being used to drive a ducted fan, with both of those contributing to the thrust. The ratio of the mass-flow of air bypassing the engine core compared to the mass-flow of air passing through the core is referred to as the bypass ratio. The engine produces thrust through a combination of these two portions working in concert; engines that use more jet thrust relative to fan thrust are known as low bypass turbofans, conversely those that have considerably more fan thrust than jet thrust are known as high bypass. Most commercial aviation jet engines in use today are of the high-bypass type, and most modern military fighter engines are low-bypass. Afterburners are not used on high-bypass turbofan engines but may be used on either low-bypass turbofan or turbojet engines.Most of the air flow through a high-bypass turbofan is low-velocity bypass flow: even when combined with the much higher velocity engine exhaust, the average exhaust velocity is considerably lower than in a pure turbojet. Turbojet engine noise is predominately jet noise from the high exhaust velocity, therefore turbofan engines are significantly quieter than a pure-jet of the same thrust with jet noise no longer the predominant source. Other noise sources are the fan, compressor and turbine Jet noise is reduced with "chevrons" on the exhaust nozzles on the Rolls-Royce Trent 1000 and General Electric GEnx engines used on the Boeing 787.Since the efficiency of propulsion is a function of the relative airspeed of the exhaust to the surrounding air, propellers are most efficient for low speed, pure jets for high speeds, and ducted fans in the middle. Turbofans are thus the most efficient engines in the range of speeds from about 500 to 1,000 km/h (310 to 620 mph), the speed at which most commercial aircraft operate. Turbofans retain an efficiency edge over pure jets at low supersonic speeds up to roughly Mach 1.6, but have also been found to be efficient when used with continuous afterburner at Mach 3 and above.The vast majority of turbofans follow the same basic design, with a large fan at the front of the engine and a relatively small jet engine behind it. There have been a number of variations on this design, however, including rear-mounted fans which can easily be added to an existing pure-jet design, or designs that combine a low-pressure turbine and a fan stage in a single rear-mounted unit.".
- Turbofan thumbnail Turbofan_operation.svg?width=300.
- Turbofan wikiPageID "103077".
- Turbofan wikiPageLength "58173".
- Turbofan wikiPageOutDegree "363".
- Turbofan wikiPageRevisionID "680250525".
- Turbofan wikiPageWikiLink ALF502.
- Turbofan wikiPageWikiLink Acoustic_liner.
- Turbofan wikiPageWikiLink Advanced_Medium_Combat_Aircraft.
- Turbofan wikiPageWikiLink Aero_L-159_Alca.
- Turbofan wikiPageWikiLink Aeronautical_Development_Agency.
- Turbofan wikiPageWikiLink Afterburner.
- Turbofan wikiPageWikiLink Airbreathing_jet_engine.
- Turbofan wikiPageWikiLink Airbus_A300.
- Turbofan wikiPageWikiLink Airbus_A310.
- Turbofan wikiPageWikiLink Airbus_A320.
- Turbofan wikiPageWikiLink Airbus_A320_family.
- Turbofan wikiPageWikiLink Airbus_A330.
- Turbofan wikiPageWikiLink Airbus_A340.
- Turbofan wikiPageWikiLink Airbus_A350.
- Turbofan wikiPageWikiLink Airbus_A350_XWB.
- Turbofan wikiPageWikiLink Airbus_A380.
- Turbofan wikiPageWikiLink Aircraft.
- Turbofan wikiPageWikiLink Aircraft_engine.
- Turbofan wikiPageWikiLink Airline.
- Turbofan wikiPageWikiLink Airlines.
- Turbofan wikiPageWikiLink Alenia_Aermacchi_M-346.
- Turbofan wikiPageWikiLink Alenia_Aermacchi_M-346_Master.
- Turbofan wikiPageWikiLink Allison_Engine_Company.
- Turbofan wikiPageWikiLink Alloy.
- Turbofan wikiPageWikiLink Antonov_An-124.
- Turbofan wikiPageWikiLink Antonov_An-124_Ruslan.
- Turbofan wikiPageWikiLink Antonov_An-148.
- Turbofan wikiPageWikiLink Antonov_An-225.
- Turbofan wikiPageWikiLink Antonov_An-225_Mriya.
- Turbofan wikiPageWikiLink Antonov_An-72.
- Turbofan wikiPageWikiLink Apollo_program.
- Turbofan wikiPageWikiLink Arkhip_Lyulka.
- Turbofan wikiPageWikiLink Auxiliary_power_unit.
- Turbofan wikiPageWikiLink Aviadvigatel.
- Turbofan wikiPageWikiLink Aviadvigatel_PD-14.
- Turbofan wikiPageWikiLink Aviadvigatel_PS-90.
- Turbofan wikiPageWikiLink Aviation.
- Turbofan wikiPageWikiLink Avio.
- Turbofan wikiPageWikiLink Avionics.
- Turbofan wikiPageWikiLink Axial_compressor.
- Turbofan wikiPageWikiLink Axial_fan_design.
- Turbofan wikiPageWikiLink Beechcraft.
- Turbofan wikiPageWikiLink Beriev_Be-200.
- Turbofan wikiPageWikiLink Boeing.
- Turbofan wikiPageWikiLink Boeing_717.
- Turbofan wikiPageWikiLink Boeing_737.
- Turbofan wikiPageWikiLink Boeing_747.
- Turbofan wikiPageWikiLink Boeing_747-8.
- Turbofan wikiPageWikiLink Boeing_767.
- Turbofan wikiPageWikiLink Boeing_777.
- Turbofan wikiPageWikiLink Boeing_787.
- Turbofan wikiPageWikiLink Boeing_787_Dreamliner.
- Turbofan wikiPageWikiLink Boeing_C-17_Globemaster_III.
- Turbofan wikiPageWikiLink F_Super_Hornet.
- Turbofan wikiPageWikiLink Bombardier_Challenger_300.
- Turbofan wikiPageWikiLink Bristol_Siddeley.
- Turbofan wikiPageWikiLink British_Aerospace_146.
- Turbofan wikiPageWikiLink Bypass_ratio.
- Turbofan wikiPageWikiLink C-17_Globemaster_III.
- Turbofan wikiPageWikiLink C-5_Galaxy.
- Turbofan wikiPageWikiLink CFE_CFE738.
- Turbofan wikiPageWikiLink CFM56.
- Turbofan wikiPageWikiLink CFM_International.
- Turbofan wikiPageWikiLink CFM_International_CFM56.
- Turbofan wikiPageWikiLink Category:Gas_turbines.
- Turbofan wikiPageWikiLink Category:Jet_engines.
- Turbofan wikiPageWikiLink Cessna_CitationJet.
- Turbofan wikiPageWikiLink Compressor_map.
- Turbofan wikiPageWikiLink Core_power.
- Turbofan wikiPageWikiLink Core_size.
- Turbofan wikiPageWikiLink Crystallite.
- Turbofan wikiPageWikiLink Daimler-Benz_DB_007.
- Turbofan wikiPageWikiLink Defence_Research_and_Development_Organisation.
- Turbofan wikiPageWikiLink Douglas_DC-10.
- Turbofan wikiPageWikiLink Ducted_fan.
- Turbofan wikiPageWikiLink ETOPS.
- Turbofan wikiPageWikiLink Eastern_Bloc.
- Turbofan wikiPageWikiLink Embraer.
- Turbofan wikiPageWikiLink Engine_Alliance.
- Turbofan wikiPageWikiLink Engine_Alliance_GP7000.
- Turbofan wikiPageWikiLink Engine_pressure_ratio.
- Turbofan wikiPageWikiLink Epicyclic_gearing.
- Turbofan wikiPageWikiLink EuroJet_Turbo_GmbH.
- Turbofan wikiPageWikiLink Eurofighter_Typhoon.
- Turbofan wikiPageWikiLink Eurojet_EJ200.
- Turbofan wikiPageWikiLink F-111.
- Turbofan wikiPageWikiLink F-14_Tomcat.
- Turbofan wikiPageWikiLink F-15_Eagle.
- Turbofan wikiPageWikiLink F-16_Fighting_Falcon.
- Turbofan wikiPageWikiLink F-22_Raptor.
- Turbofan wikiPageWikiLink F-35_Lightning_II.
- Turbofan wikiPageWikiLink F_Super_Hornet.
- Turbofan wikiPageWikiLink A-18_Hornet.
- Turbofan wikiPageWikiLink F119.