Abstract
The effects of an above-exit circular disk on the flow structures, turbulence properties, and mixing characteristics of swirling jets separated by a large diameter blockage disk at jet exit are studied by using the smoke-wire flow-visualization technique and a two-component laser Doppler velocimeter. A carbon-dioxide tracer-gas experiment is conducted to examine the mixing capability of the flows modulated by the control disk. The smoke-streak flow patterns, characteristic lengths, velocity vectors, streamlines, velocity distributions, turbulence properties, and concentration distributions of the carbon dioxide are presented and discussed. Topological techniques are applied to analyze and interpret the flow patterns. With the variation of the distance between the control and blockage disks and the central jet Reynolds number, the bubble structures in the near field display complex behaviors of extension, escape, and encapsulation. Under the influence of the control disk, the central jet deflects radially, merges with the swirling annular flow, then turns downstream to form a recirculation bubble in the control-disk wake
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