Abstract
The interaction of vortex rings and streamwise vortices in an axisymmetric jet is studied by flow visualization and velocity measurement. The jet is excited by axial and azimuthal perturbations to stabilize and enhance axisymmetric and streamwise vortices. A laser fluorescent dye and a laser light sheet are used to visualize the jet. The three-dimensional views of jet-boundary surface and streamwise vortices are constructed by applying the Taylor hypothesis to the jet cross-sectional images. From the three-dimensional views, the interaction model of axisymmetric and streamwise vortices is proposed. The characteristics of the flow field and the entrainment of the jet are also discussed in relation to the vortical structure.
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