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US 6,983,588 B2Granted
Turbofan variable fan nozzle
AssigneeThe NORDAM Group, Inc.
InventorJean-Pierre Lair
Life of this patent
Estimating the term…
Abstract
A turbofan exhaust nozzle includes a fan duct defined between a fan nacelle and core engine cowling. The duct includes an arcuate outlet at the trailing edge of the nacelle. A movable flap is disposed in a minor portion of the fan duct, with a remaining major portion of the fan duct having a constant flow area. The flap may be moved between stowed and deployed positions to locally decrease flow area inside the duct for noise attenuation.
Claims20
A turbofan exhaust nozzle comprising:
- a fan nacelle surrounding a core engine cowling to define a fan duct radially therebetween for discharging fan air;
- said fan duct including an arcuate outlet disposed radially between said cowling and a trailing edge of said nacelle;
- said fan duct further including a movable flap disposed solely in a minor portion thereof, with a remaining major portion of said fan duct having a constant flow area;
- and
- means for selectively moving said flap from a stowed position to a deployed position inside said fan duct to locally decrease flow area inside said fan duct for discharging said fan air through said fan duct outlet.
2 more elements
An turbofan exhaust nozzle comprising:
- a fan nacelle surrounding a core engine cowling with arcuate portions joined together at circumferentially opposite endwalls to define a pair of C-shaped fan ducts for discharging fan air therefrom;
- each of said fan ducts including an arcuate outlet disposed radially between said cowling and a trailing edge of said nacelle;
- and
- each of said fan ducts further including a flap pivotally mounted in a respective one of said endwalls for locally varying flow area in a minor portion of said fan ducts, with remaining major portions of said fan ducts having a constant flow area.
1 more element
Dependencies are inferred from the claim text.