Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent
1990-04-02
1992-03-03
Fuller, Benjamin R.
Acoustics
Sound-modifying means
Muffler, fluid conducting type
181220, 181296, 23926523, 244 1N, F02K 134
Patent
active
050924257
ABSTRACT:
An apparatus for and method of suppressing noise generated by the primary exhaust gas flow from jet engine nozzles or the like without significantly affecting thrust. A secondary jet stream is provided exteriorly of the primary exhaust gas flow for interacting at the boundary between the exhaust gas flow and the ambient air immediately adjacent the exit end of the nozzle to preclude the formation and propagation of noise generating phenomena. The pressure of the secondary jet stream can be varied in accordance with noise levels sensed at the nozzle exit end to provide optimum noise suppression under essentially all conditions of exhaust gas flow.
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Bobb Alrick
Fuller Benjamin R.
Nypaver Edward W.
Singer Donald J.
The United States of America as represented by the Secretary of
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