| 摘要 |
A turbofan exhaust nozzle 28 includes a fan duct 40 defined between a fan nacelle 32 and core engine cowling 30. The duct 40 includes an arcuate outlet 42 at the trailing edge 44 of the nacelle 32. A movable flap 46 is disposed in a minor portion of the fan duct 40, with a remaining major portion of the fan duct having a constant flow area. The flap 46 may be moved between stowed and deployed positions to locally decrease flow area inside the duct 40 for noise attenuation.
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