noise reduction in a jet engine  by nuub Tags: engine, noise,
reduction nuub is offline Mar15-04, 02:26 PM P: 9 I am in the
process of writing a report on the Physics of Jet engines and I
have come accross a problem I cannot comprehend. In the exhaust
of many jet engines they allow the atmospheric air to mix with
the air from the engine to reduce exhaust noise. From what I
understand this allows the gasses to mix faster, but why does
this help reduce noise?  So far I think it is to do with the
increased speed of mixing means that the pressure wave built up
if of a higher frequency and so perhaps it is outside our
hearing range? This doesn't seem quite right.  If anyone knows
of how it actually works, or any other mechanisms that are
employed to reduce noise please tell me. Phys.Org News Partner
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