Apparatus and method for jet noise suppression

Details Apparatus and method for jet noise suppression Apparatus and method for jet noise suppression

1981-02-27

1983-08-16

Nase, Jeffrey V.

Fluid sprinkling, spraying, and diffusing

Reaction motor discharge nozzle

With addition of secondary fluid upstream of outlet

B63H 2546

Patent

active

043986676

ABSTRACT:
A method and apparatus for jet noise suppression through control of the static pressure of the jet and control of the rate of entrainment of ambient fluid into the jet downstream of the exhaust nozzle is disclosed and serving to regulate the momentum flux over an extended region of the jet, affecting Reynolds stresses in the jet and the spreading angle of the jet. Static pressure is controlled through a long hollow, porous nozzle plug centerbody which may be selectively vented to ambient conditions, connected to a vacuum source, or supplied with fluids of various densities for injection into the stream. Additionally, sound in the jet may be channeled along the nozzle plug centerbody by injecting coolant such as a cryogenic fluid through the center-body into the jet.

REFERENCES:
patent: 3153319 (1964-10-01), Young et al.
patent: 3575260 (1971-04-01), Urguhart
patent: 3739984 (1973-06-01), Tontini
patent: 3815356 (1974-06-01), Burge et al.

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