Dry cooled jet aircraft runup noise suppression system

Details Dry cooled jet aircraft runup noise suppression system Dry cooled jet aircraft runup noise suppression system

1977-03-23

1978-10-31

Godici, Nicholas P.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181220, F01N 102, F01N 702

Patent

active

041229126

ABSTRACT:
A stationary jet exhaust noise suppressor has an elongate housing contain a longitudinal tunnel. The hot exhaust from a jet engine blows through the tunnel and is deflected upwards at the tunnel's end. A number of resonant chambers are located along the tunnel's length and have resonant frequencies corresponding to objectional frequencies in the jet exhaust noise spectrum. Since there are a number of perforations in the walls of the tunnel, the resonant chambers are put in communication with the jet exhaust noise in the tunnel to attenuate the objectionable frequencies. Since the resonant chambers are formed by rigid stainless steel panels, trouble free, long term noise suppression is assured. A cooling duct is provided in the walls of the housing to draw in ambient air to reduce the possibility of heat damage.

REFERENCES:
patent: 2810449 (1957-10-01), Coleman
patent: 2864455 (1958-12-01), Hirschorn
patent: 2940537 (1960-06-01), Smith
patent: 3620329 (1971-11-01), Wenzlaff
patent: 3709319 (1973-01-01), Lawyer

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