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Powerplant: Difference between revisions
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==Turbofan== | ==Turbofan== | ||
[[Image:Turbofan.jpg|thumb|300px|Turbofan on the wing of a [[Boeing 777-200]]]]A '''turbofan''' is a type of jet engine, similar to a turbojet. It essentially consists of a ducted fan with a smaller diameter turbojet engine mounted behind it that powers the fan. Part of the airstream from the ducted fan passes through the turbojet where it is burnt to power the fan, but the majority of the flow bypasses it, and very often produces most of the thrust. | [[Image:Turbofan.jpg|thumb|300px|Turbofan on the wing of a [[Boeing 777-200]]]]A '''turbofan''' is a type of jet engine, similar to a turbojet. It essentially consists of a ducted fan with a smaller diameter turbojet engine mounted behind it that powers the fan. Part of the airstream from the ducted fan passes through the turbojet where it is burnt to power the fan, but the majority of the flow bypasses it, and very often produces most of the thrust. | ||
== | ==Thrust reversal== | ||
[[Image:Thrust_reversers.jpg|thumb|300px|Thrus reverser (red) on the tail of a [[Cessna Citation Bravo]]]]'''Thrust reversal''', also called reverse thrust, is the temporary diversion of an aircraft engine's output so that the thrust produced is directed forward, rather than aft. This acts against the forward travel of the aircraft, providing deceleration. Thrust reversers are used by many jet aircraft to help slow down just after touch-down, reducing wear on the brakes and enabling shorter landing distances. It is also available on many propeller aircraft through reversing the controllable pitch propellers to a negative angle. | [[Image:Thrust_reversers.jpg|thumb|300px|Thrus reverser (red) on the tail of a [[Cessna Citation Bravo]]]]'''Thrust reversal''', also called '''reverse thrust''', is the temporary diversion of an aircraft engine's output so that the thrust produced is directed forward, rather than aft. This acts against the forward travel of the aircraft, providing deceleration. Thrust reversers are used by many jet aircraft to help slow down just after touch-down, reducing wear on the brakes and enabling shorter landing distances. It is also available on many propeller aircraft through reversing the controllable pitch propellers to a negative angle. | ||
==Afterburners== | ==Afterburners== | ||
[[Image:Afterburner.jpg|thumb|300px|Afterburner on the tail of a [[General_Dynamics_F-16|F16]]]]An '''afterburner''' is an additional component added to some jet engines, primarily those on supersonic aircraft. Its purpose is to provide a temporary increase in thrust, both for supersonic flight and for takeoff (as the high wing loading typical of supersonic aircraft designs means that take-off speed is very high). On military aircraft the extra thrust is also useful for combat situations. This is achieved by injecting additional fuel into the jet pipe downstream of (i.e. after) the turbine. This fuel is ignited by the hot exhaust gases and adds greatly to the thrust of the engine. The advantage of afterburning is significantly increased thrust; the disadvantage of afterburning is its very high fuel consumption and inefficiency but this is acceptable for the short periods in which it is usually used. | [[Image:Afterburner.jpg|thumb|300px|Afterburner on the tail of a [[General_Dynamics_F-16|F16]]]]An '''afterburner''' is an additional component added to some jet engines, primarily those on supersonic aircraft. Its purpose is to provide a temporary increase in thrust, both for supersonic flight and for takeoff (as the high wing loading typical of supersonic aircraft designs means that take-off speed is very high). On military aircraft the extra thrust is also useful for combat situations. This is achieved by injecting additional fuel into the jet pipe downstream of (i.e. after) the turbine. This fuel is ignited by the hot exhaust gases and adds greatly to the thrust of the engine. The advantage of afterburning is significantly increased thrust; the disadvantage of afterburning is its very high fuel consumption and inefficiency but this is acceptable for the short periods in which it is usually used. | ||