Reduced noise jet engine

Details Reduced noise jet engine Reduced noise jet engine

2004-11-12

2009-06-16

Kim, Ted (Department: 3741)

Power plants

Reaction motor

Method of operation

C060S226100, C060S264000, C060S771000, C239S265190

Reexamination Certificate

active

07546727

ABSTRACT:
A system for controlling a position of jet engine exhaust mixing tabs includes a plurality of exhaust mixing tabs spaced apart from one another and extending from a lip of an exhaust nozzle of a jet engine nacelle adjacent a flow path of an exhaust flow emitted from the exhaust nozzle. Each of the exhaust mixing tabs are constructed to be controllably deformable from a first position adjacent the flow path to a second position extending into the flow path of the exhaust flow in response to a control signal applied to each of the exhaust mixing tabs. In the first position, the exhaust mixing tabs either have no affect on the thrust produced, or increase the momentum (thrust) of the exhaust flow exiting from the exhaust nozzle. In the second position, that is, the “deployed” position, the exhaust mixing tabs are deformed to extend into the flow path. In this position the exhaust mixing tabs promote mixing of the exhaust flow with an adjacent air flow. This results in the attenuation of noise generated by the jet engine.

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