| 摘要 |
1,219,827. Gas turbine ducted fan engines. ROLLS ROYCE Ltd. May 13, 1969 [May 20, 1968], No.23976/68. Heading F1J. [Also in Division F2] A gas turbine ducted fan engine comprises a compressor 12 and turbine 14 mounted on a mainshaft 16 and a centrifugal clutch 27 for connecting a ducted fan 24 to the main shaft. The engine shown is a front fan type engine having combustion equipment 13. The ducted fan 24 is disposed upstream of the compressor 12 and may be connected to the shaft 16 by the clutch 27. The fan 24 is disposed within a casing 22, part of the air from the fan passing to the compressor 12 and part passing to a by-pass duct 23. Air inlet openings 25 may be formed in the casing 22 to provide an auxiliary intake for air flowing through the by-pass duct. The engine may be used in an aircraft to drive auxiliary equipment such as an alternator or as a booster engine to boost take-off thrust with the ducted fan operative.
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