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Simulation and Analysis of Noise Associated with Muzzle Flow
A numerical study of a muzzle blast flow-field is performed and analyzed to understand the evolution of flow structures and to examine the sound wave generation mechanisms in the near field. The analysis of vortex dynamics based on the vorticity transport equation shows that the dilatation term cont...
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Published in: | International journal of aeroacoustics 2013-01, Vol.12 (1-2), p.21-51 |
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Main Authors: | , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | A numerical study of a muzzle blast flow-field is performed and analyzed to understand
the evolution of flow structures and to examine the sound wave generation mechanisms in
the near field. The analysis of vortex dynamics based on the vorticity transport equation
shows that the dilatation term contributes more than the baroclinic term to vorticity
generation and deformation. The motion of the vortex structures is found to be similar in
the cases studied here: the main vortex formation, additional vortex generation and their
interactions. The Helmholtz decomposition and acoustic perturbation equations are used to
analyze the sound generation mechanism in the muzzle flow. The most significant sound
source term is identified and the dominant sound generation phenomenon is shown to occur
near the vortex ring region and not in the shocked jet flow. |
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ISSN: | 1475-472X 2048-4003 |
DOI: | 10.1260/1475-472X.12.1-2.21 |