Engine noise suppression ejector nozzle

Details Engine noise suppression ejector nozzle Engine noise suppression ejector nozzle

1996-11-04

1999-03-23

Casaregola, Louis J.

Fluid sprinkling, spraying, and diffusing

Reaction motor discharge nozzle

With retractable noise suppressing stream divider

23926517, 181220, F02K 134

Patent

active

058848436

ABSTRACT:
A moderately high bypass ratio turbofan engine nozzle (36) is provided including an outer structure (46) and one or more ejectors (38). The ejectors (38) include inner and outer doors (82), (80) for closing off an ejector passage (76) extending through the outer structure (46). The ejectors (38) are sized to entrain exterior air (40) at aspiration ratios of generally less than 60%. The exterior air (40) is mixed with engine exhaust (42), resulting in a lower combined airflow velocity which in turn reduces jet exhaust noise. Mixing components formed as turning vanes (108) are located in the ejector passage (76) for encouraging further mixing of the airflows (40), (42). In preferred embodiments, the nozzle (36) further includes a translatable centerbody (52), an aft flap assembly (112), and a control system (122) for controlling the movements of the nozzle components. A method of suppressing aircraft moderately high bypass ratio turbofan engine exhaust noise including entraining exterior air to engine exhaust at an aspiration ratio of less than about 60%.

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