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A Caltech Library Repository Feedhttp://www.rssboard.org/rss-specificationpython-feedgenenTue, 16 Apr 2024 13:21:55 +0000Effect of flow on the acoustic reflection coefficient at a duct inlet
https://resolver.caltech.edu/CaltechAUTHORS:20101217-092218676
Authors: {'items': [{'id': 'Bohn-M-S', 'name': {'family': 'Bohn', 'given': 'M. S.'}}, {'id': 'Zukoski-E-E', 'name': {'family': 'Zukoski', 'given': 'E. E.'}}]}
Year: 1976
DOI: 10.1121/1.380993
The effect of duct Mach number upon the acoustic reflection coefficient at the inlet of a duct with mean
flow is investigated. An analysis, which models the duct inlet as a very short, one-dimensional nozzle over
which the mean flow is accelerated from rest, gives good agreement with some recent experimental results.
Discrepancies between the analysis and the experimental results are discussed in terms of radiation losses at
the inlet and real fluid-flow effects within the duct.https://authors.library.caltech.edu/records/kffek-6v129Response of a subsonic nozzle to acoustic and entropy disturbances
https://resolver.caltech.edu/CaltechAUTHORS:20101213-104516314
Authors: {'items': [{'id': 'Bohn-M-S', 'name': {'family': 'Bohn', 'given': 'M. S.'}}]}
Year: 1977
DOI: 10.1016/0022-460X(77)90647-2
The one-dimensional response of a subsonic nozzle flow to small pressure and entropy
disturbances is calculated. The response is expressed in terms of transmitted acoustic
waves (which propagate from the nozzle in the same direction as the disturbance wave)
and reflected acoustic waves (which propagate from the nozzle in the direction opposite to
that of the disturbance wave) for three independent disturbances: a downstreampropagating
acoustic wave impinging upon the nozzle inlet, an upstream-propagating
wave impinging upon the nozzle exit, and an entropy wave convecting through the nozzle.
The solution for high frequency disturbances is discussed and used with the compact (long
wavelength disturbance) solution to normalize several numerical calculations. The
normalization shows that the transmitted waves created by the two acoustic disturbances
may be represented by the same function offrequency for a given inlet and exit nozzle Mach
number. The same is seen to be true for the reflected waves created by the two acoustic
disturbances. The normalization allows results for a wide range of nozzle Mach number
distributions and disturbance frequencies to be presented concisely.https://authors.library.caltech.edu/records/rcbyj-4ny65