Cascade plug nozzle

Details Cascade plug nozzle Cascade plug nozzle

1974-07-12

1976-02-17

Love, John J.

Fluid sprinkling, spraying, and diffusing

Reaction motor discharge nozzle

181 33HC, B63H 1100

Patent

active

039387429

ABSTRACT:
An exhaust nozzle for a jet aircraft provides jet noise suppression. The nozzle includes a plurality of coaxial airfoil ring segments which are spaced serially along the longitudinal axis of the nozzle to define a plurality of annular coaxial channels therebetween. The diameters of the segments progressively decrease downstream along this axis and the exits of the channels are non-coplanar. The radial depths of the channels are small as compared with the axial distance between adjacent channel exits so that noise is emitted non-simultaneously from the channel exits as a series of weakened pulses staggered in time. The boattail angles of the outer surfaces of the ring airfoil segments increase in magnitude with increasing distance downstream to reduce drag.

REFERENCES:
patent: 1493157 (1924-05-01), Melot
patent: 2866316 (1958-12-01), Towle et al.
patent: 2995200 (1961-08-01), Seifert
patent: 3441218 (1969-04-01), Bucher
patent: 3721389 (1973-03-01), MacKinnon

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