Device to provide flow inversion in a turbofan exhaust tailpipe

Details Device to provide flow inversion in a turbofan exhaust tailpipe Device to provide flow inversion in a turbofan exhaust tailpipe

1977-01-27

1979-01-23

Garrett, Robert E.

Power plants

Reaction motor

Air passage bypasses combustion chamber

181213, 181220, F02K 302

Patent

active

041353633

ABSTRACT:
Jet noise generation occasioned from the gaseous streams in the coaxial streams of a turbofan engine when they as well as the ambient stream encounter is reduced by designing the engine so that the value of the true velocity of the outer stream is substantially higher than the value of the true velocity of the inner stream. It is contemplated that for a turbofan engine the fan stream and primary or engine core streams are inverted so that the higher velocity stream would be in the outer coaxial passage immediately upstream of the point where the streams discharge to ambient. A modified conventional lobe mixer is utilized to invert flow streams.

REFERENCES:
patent: 3527317 (1970-09-01), Motsinger
patent: 3578106 (1971-05-01), Ellis
patent: 3655009 (1972-04-01), Hilbig
patent: 3861140 (1975-01-01), Krabacher
patent: 3968647 (1976-07-01), Boudigues
patent: 3987621 (1976-10-01), Sabatella, Jr. et al.
patent: 4066214 (1978-01-01), Johnson

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