INTERACTIONS OF RADIALLY OUTGOING JETS THROUGH GAPS BETWEEN PERIODICALLY ARRANGED BARS IN A CIRCLE(Free and Confined Jet)

概要

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Mutual interactions of jets radially spouting from gaps between periodically arranged sector-shaped bars in a circle are investigated by numerical simulation assuming a two-dimensional and incompressible flow field. The jets are independent of each other at small Reynolds numbers, but interact in a complex manner to yield various flow patterns such as confluences of several jets or oscillatory flows synchronized in the same phase in several jets. We found that the conference of two or three steady jets occurs due to a pitchfork bifurcation and that the synchronized oscillation is a consequence of a Hopf bifurcation. Quasi-periodic oscillation in jets is also found and confirmed to appear as a consequence of a Neimark-Sacker bifurcation (a Hopf bifurcation for maps). The critical Reynolds numbers for these bifurcations are determined for each value of the pitch-to-nozzle-width ratio.
社団法人日本機械学会の論文
2005-10-05