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Transient Acoustical Sources in an Idealized Jet

Authors: E. W. Graham; B. B. Graham;

Transient Acoustical Sources in an Idealized Jet

Abstract

The transmission of acoustic disturbances from the interior of the jet through the mean velocity profile and into the farfield is studied in detail. The noise generator is taken to be a sequence of transient acoustical point sources traveling with the local fluid in the idealized jet. The idealized jet is two-dimensional, and extends to infinity upstream and downstream with velocity profile independent of streamwise position. For the limited set of examples considered the following conclusions apply: (1) Velocity profile has a large effect on the magnitude of the noise radiated to the farfield. (2) Much of the farfield noise, especially at low Strouhal numbers, originates not as true waves but in the form of acoustical disturbances within the jet which are not radiating energy. (3) At subsonic velocities, the characteristic lobes appearing in a polar plot of farfield mean-square pressure approach the downstream axis as frequency decreases. This somewhat resembles experimental trends, but many other factors must be considered before a valid comparison can be made.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
Average
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