Author:
HULSHOFF S. J.,HIRSCHBERG A.,HOFMANS G. C. J.
Abstract
The factors which affect the sound production of a vortex as it passes through a
nozzle are investigated at both low and high Mach numbers using time-accurate
inviscid-flow computations. Vortex circulation, initial position, and mean-flow Mach
number are shown to be the primary factors which influence the amplitude and phase
of the sound produced. Nozzle geometry and distribution of vorticity are also shown
to play significant roles in determining the detailed form of the signal. Additionally,
it is shown that solution bifurcations are possible at sufficiently large values of
vortex circulation. Comparisons are made between sound signals computed directly
using a numerical method for the Euler equations and predictions obtained using a
compressible vortex-sound analogy coupled with a compact-source assumption for
the computation of vorticity dynamics. The results confirm that the latter approach is
accurate for a range of problems with low mean-flow Mach numbers. At higher Mach
numbers, however, the non-compactness of the source becomes apparent, resulting
in significant changes to the character of the signal which cannot be predicted using
the analogy-based approach. Implications for the construction of simplified models
of vortex sound in solid-rocket nozzles are discussed.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
30 articles.
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