Engine noise

Details Engine noise Engine noise

2006-03-03

2010-06-15

Donels, Jeffrey (Department: 2832)

Acoustics

Sound-modifying means

Muffler, fluid conducting type

C181S220000, C181S214000, C181S215000, C181S219000, C244S00100R, C244S05300R, C244S062000, C415S119000

Reexamination Certificate

active

07735601

ABSTRACT:
In order to provide noise suppression, bumps or undulations are provided on a nozzle surface in order to vary the convergent-divergent ratio between that surface and an opposed nozzle surface. By such an approach, a circumferential variation in the shock cell pattern is created and the flow is deflected so as to enhance turbulent mixing thereby suppressing noise.

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