turbofan
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Article
37 sectionsContents
- Principles
- Bypass ratio
- Efficiency
- Thrust
- Nozzles
- Noise
- History
- Common types
- Low-bypass turbofan
- Afterburning turbofan
- High-bypass turbofan
- Turbofan configurations
- Single-shaft turbofan
- Aft-fan turbofan
- Two-spool
- Boosted two-spool
- Three-spool
- Geared fan
- Military turbofans
- High-pressure turbine
- Low-pressure turbine
- Overall performance
- Cycle improvements
- Thrust growth
- Technical discussion
- Improvements
- Aerodynamic modelling
- Blade technology
- Fan blades
- Future progress
- Manufacturers
- Commercial turbofans in production<!-- For an engine added, alphabetical order of the manufacturer, followed by alphabetical order for the model -->
- Extreme bypass jet engines
- Terminology
- See also
- References
- External links
thumb|360px|alt=Animation of turbofan, which shows flow of air and the spinning of blades.|Animation of a 2-spool, high-bypass turbofan
A turbofan or fanjet is a type of airbreathing jet engine that is widely used in 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 adds kinetic energy to the air passing through it by burning fuel, and a ducted fan powered by energy from the gas turbine to force air rearwards. Whereas all the air taken in by a turbojet passes through the combustion chamber and turbines, in a turbofan some of the air entering the nacelle bypasses these components. A turbofan can be thought of as a turbojet being used to drive a ducted fan, with both of these contributing to the thrust.