Appeal No. 2003-0470
Application 09/671,870
further consideration by the examiner pursuant to a
restriction requirement.
Appellant’s invention generally relates to a
device and method for mixing flows to attenuate noise and
augment thrust of a jet engine. More particularly, the
subject matter on appeal is directed to a method for
reducing the noise emitted by a flow of exhaust from an
outlet of a jet propulsion engine having a turbine with a
plurality of turbine stages. The method is set forth in
claim 1 on appeal as comprising the steps of: a) segre-
gating the exhaust flow of the jet propulsion engine into a
plurality of rotating high velocity, low density jets and a
plurality of rotating low pressure voids; and b) employing
the low pressure voids to entrain at least a portion of a
secondary flow of air, with the jets and the entrained
secondary flow mixing to produce a mixed flow having a
relatively higher flow rate and a relatively lower velocity
than the exhaust flow.
2
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