Variable shape, fluid flow nozzle for sound suppression

Details Variable shape, fluid flow nozzle for sound suppression Variable shape, fluid flow nozzle for sound suppression

1982-03-22

1983-12-27

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

23926513, 23926539, 60230, F02K 112

Patent

active

044225245

ABSTRACT:
The invention is an aircraft jet engine variable shape, fluid flow nozzle (10) which is adjustable to sound-suppression (take-off) and nozzle open (cruise) modes. In the take-off or sound-suppression mode a plurality of movable flaps (24) are positioned inwardly by actuators (36) so as to form a fluted arrangement with a plurality of webs (13) that define the periphery of the nozzle (10) exit. A plurality of transverse fins (32) on the flaps (24) maintain a seal via a plurality of seals (34) with the web side walls (22). In the nozzle open or cruise mode of operation the guide vanes (26) of the flaps (24) are maintained in alignment with the outer walls of the webs (13) to form a maximum area-circular cross-section nozzle exit.

REFERENCES:
patent: 2978061 (1961-04-01), Keen
patent: 3061038 (1962-10-01), Lawler et al.
patent: 3133412 (1964-05-01), Westley
patent: 3153319 (1964-10-01), Young et al.
patent: 3351155 (1967-11-01), Hoch et al.
patent: 3973731 (1976-08-01), Thayer
patent: 3976160 (1976-08-01), Hoch et al.

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