Jet nozzle mixer

Details Jet nozzle mixer Jet nozzle mixer

2006-09-26

2006-09-26

Kim, Ted (Department: 3746)

Power plants

Reaction motor

Method of operation

C060S226200, C060S262000, C239S265170, C181S220000

Reexamination Certificate

active

07111448

ABSTRACT:
An external jet nozzle mixer includes identically formed lobes. The external mixer works with the internal mixer further to mix the engine internal bypass flow with the internal jet engine core flow to level the disparate flow velocities, to reduce the peak velocities from the jet engine core and increase the lower bypass velocities of the engine internal bypass flow, and thereby reduce noise. The internal lobe contours act as lifting flutes, causing mixing of the primary hot and cold flows to mix before exiting the nozzle. The external lobe contours act as venturi chutes, accelerating the cooler ambient secondary air flow. The lobes thus act collectively as an injector to force the cooler ambient secondary flow into the previously mixed primary flow as it exits the nozzle. Also obtained is an increased thrust efficiency and a consequently decreased fuel consumption and engine emissions.

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