Abstract
This paper is an extension of the work reported earlier as part 1 in a companion paper. It endeavours first to discover how the vortex-street structure in the round jet develops during its passage downstream, and secondly to resolve some of the questions concerning the flow structure in the outer part of the mixing region. It appears that the main vortex street that was reported in part 1 has a trajectory that converges on the jet axis at about two potential core lengths from the nozzle. This brings the vortex cores towards the axis and contributes to the erosion of the potential core. A branch vortex street apparently forms on the outer part of the jet mixing region downstream of x/D = 1.5, and as the main vortex street approaches the axis, the branch vortex street moves outwards. The vortices in the branch are jostled occasionally by those in the main vortex street, and various effects are caused, including the frequency modulation of the signals in the outer part of the mixing region. Measurements at higher Mach numbers confirm the appropriateness of Strouhal number scaling of the jet data for the full range of subsonic Mach numbers and suggest that the structure described in this paper is valid up to the sonic speed.
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