| 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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