The interaction of three-dimensional vortex flows
Date
2014-09-02
Authors
Cooppan, Sambharthan
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Abstract
The interaction of three dimensional vortex
ows was investigated through vortex
shedding o a discontinuous edge. Two 90 edges (up and downstream edges) were
separated by an o set. The size of the o set (5mm, 10mm and 20mm) and the Mach
number (Mach 1.32, 1.42 and 1.6) were the key parameters investigated. Experi-
mental images were taken and computational simulations were run; a close relation
was found between the two. This enabled the three dimensional e ects of the
ow
to be studied and analysed. It was found, as the o set increased in size; the vortices
shed o the up and downstream edges took a longer time to merge and the strength
of the interaction was weaker. The vortex topology changed with a larger o set; the
downstream vortex was thinner (in terms of cross sectional diameter), which is an
indication of a change in denisty, than the rest of the vortex along the downstream
di raction edge, adjacent to the o set. This particular feature was more prevalent
at lower Mach numbers. The e ects of a higher Mach number were to increase the
rate of dissipation of the vortices, lengthen the shear layer and make the vortex
pro le elliptical.