Abstract
The dynamical behaviour of coherent structures in counter-current axisymmetric shear flow has been experimentally studied. Two kinds of vortices, i.e., axisymmetric and helical structures, were discovered with respect to different regimes in the forward velocity versus velocity ratio diagram. On axisymmetric structures, two global self-excited oscillation modes referred to as the shear layer and jet column modes could be set in the flow system and the effect of the velocity ratio on the dynamical behaviour of this kind of structures could be concluded as the principle of relative movement. On helical structures, it is a kind of streamwise vortex structures resulting from the jet column bifurcations whose temporal asymptotic behaviour could be described as a 2-torus.
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