| 摘要 |
This Jet engine comprises of a complete low bypass turbofan unit 1 including secondary fan unit 2 and engine core, some five to eight feet ahead of which sits a larger diameter main fan unit 3 driven from the secondary fan via drive shaft 4. Between the main and secondary fans sits a reversed variable area nozzle 5 connected to the forward end of the secondary fan by a short inlet tube 6 (fitted with intercooler 12). At the back of the core sits another variable area nozzle 7 facing rearwards. This arrangement (front nozzle, inlet tube, secondary fan, core, rear nozzle) is enclosed by a variable diameter cylinder 8, providing a variable area bypass duct 9 between cylinder and engine outer casing 10 that extends backwards from the outer diameter of the main fan. A third variable area nozzle 11 is positioned aft of the outer casing facing rearwards.
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