aturbineused as anengine,especiallyfor anaircraft, thatprovidessomeforceformovementfrom thegasthat itpushesout, and some byturningalargespecialwheelwithbladesthat alsopushesairout, or anaircraftdrivenby thistypeofengine
涡轮风扇发动机,内外函喷气发动机;涡轮风扇式飞机
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In modern high-bypassturbofanengines, the fan mounted afore the jet engine core is very large.
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Although once widely used, they are relatively inefficient compared to turboprop and turbofans for subsonic flight.
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Taking the principle a step further, the high-bypassturbofanis even more efficient, having typically three spools each spinning at a different speed.
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It was a conventional design for its class, a low-wing monoplane withturbofanengines mounted in rear fuselage nacelles.
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Postwar developments of the turbojet andturbofanengines apparently obviated the need for large aircraft engines of this type.
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Afterburners are not used on high-bypassturbofanengines but may be used on either low-bypassturbofanor turbojet engines.
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Low bypass turbofans have a lower exhaust speed than turbojets and are mostly used for high sonic and transonic and low supersonic speeds.
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These engines have the fuel efficiency advantages of turboprops with the performance capability of commercial turbofans.
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The turbofans on twin engined airliners are further over-sized to cope with losing one engine during take-off, which reduces the aircraft's net thrust by 50%.
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Modern military transportturbofanengines are virtually identical to their civilian counterparts.
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This was a complex design featuring contra-rotating stages and a bypass fan, making it one of the earliestturbofandesigns to be produced.
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Nevertheless, further studies of the gearedturbofanconcept were announced.
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The endurance requirement is so strenuous that aturbofanengine may not be a viable option.
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It is particularly effective on turbofans since they are required to respond quickly to changes of the thrust setting.
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Following the crash, it is now mandatory to test all newly designed and significantly redesignedturbofanengines under representative flight conditions.
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