The structure of the central recirculation zone in enclosed swirling flow.

Chong-Yu. Ding
Swirling flows are widely used in fuel burners and combustors to provide a central recirculation zone which intensifies mixing and stabilizes the flame. In general, in a flow with sufficiently high swirl entering through a sudden expansion, the change of the tangential velocity produces an axial pressure gradient and forms a back flow near the axis which results in a central recirculation zone. In this study, the recirculation zone was measured in an experimental apparatus...
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