turbo fan

turbofan

[tur-boh-fan]
noun
a jet engine having a large impeller that takes in air, part of which is used in combustion of fuel, the remainder being mixed with the products of combustion to form a low-velocity exhaust jet.
Also called turbofan engine.


Origin:
1940–45; turbo- + fan1

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World English Dictionary
turbofan (ˈtɜːbəʊˌfæn)
 
n
1.  Also called: high bypass ratio engine a type of by-pass engine in which a large fan driven by a turbine and housed in a short duct forces air rearwards around the exhaust gases in order to increase the propulsive thrust
2.  an aircraft driven by one or more turbofans
3.  the ducted fan in such an engine

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
turbofan   (tûr'bō-fěn')  Pronunciation Key 
A type of gas turbine in which the fan driving air into a turbojet also forces additional air around the outside of the turbine, combining it with the exhaust of the turbojet to provide thrust. Turbofans are quieter than simple turbojets and somewhat more fuel efficient, and are widely used in commercial aircraft.
The American Heritage® Science Dictionary
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