Abstract
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.
Keywords
Get full access to this article
View all access options for this article.