Patent ID: 9546618
Date: 2017-01-17
CPC Classifications: F02K,F05D,Y02T

Claim:
1. A jet propulsion device having a flow vectoring duct, the jet propulsion device comprising: a substantially annular exhaust duct surrounding a jet engine center body forming a pair of concentric opposing inner and outer walls; a throat region substantially symmetrically positioned in the outer wall of the exhaust duct forming a region of convergence, where the inner and outer walls converge, an amount of convergence varying longitudinally along the walls; and a region of divergence, where the inner and outer walls diverge, an amount of divergence varying longitudinally along the walls, wherein an exit vector of an outlet plume at a first bypass engine operating condition is different than the exit vector at a second bypass engine operating condition, wherein a first transition from the first bypass engine operating condition to the second bypass engine operating condition at which differential directing of the plume occurs corresponds to a second transition between unchoked and choked operation of the exhaust duct.