Power plants – Reaction motor – Method of operation
Reexamination Certificate
2005-02-15
2005-02-15
Kim, Ted (Department: 3746)
Power plants
Reaction motor
Method of operation
C060S226200, C060S262000, C060S264000, C239S265170, C239S265190, C181S213000, C181S220000
Reexamination Certificate
active
06854260
ABSTRACT:
An external jet nozzle mixer (20) includes identically formed lobes (48), equal in number those of the internal mixer (42). External mixer (20) works with internal mixer (42), further to mix the engine internal bypass flow with the internal jet engine core flow, to level the disparate exhaust 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 to reduce noise. The internal lobe contours act as lifting flutes, causing mixing of the primary hot and cold flows before exiting the nozzle. The external lobe contours act as venturi chutes, accelerating the cooler ambient air secondary 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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Harms Donn K.
Kim Ted
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