ducted-fan engine

An aircraft engine incorporating a fan or propeller enclosed in a duct, especially a jet engine in which an enclosed fan or propellant is used to ingest ambient air to augment the gases of combustion in the jet stream. The air may be taken in at the front of the engine and passed around the combustion section, or it may be taken in aft of the combustion chamber. In the former case, the ducted fan may be considered a type of bypass engine.
Bypass air ejected directly overboard in forward-fan engine with a short fan duct.
However, in a ducted fan, bypass air is ducted along the engine’s entire length.

Aviation dictionary. 2014.

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