十字形噴流中の渦構造に関する研究

概要

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Vortical structures in a cross-shaped jet have been investigated, using a flow visualization technique by laser-fluorescent dye while controlling vortex evolutions under excitation. The corner regions of vortical structures close to the orifice undergo severe deformation due to the self-induced velocity ; the outward corners become flat and the inward corners generate outward ejection. The excitation at low frequencies produces the large-scale vortical structures, the strong self-induced velocity switching over the normal and diagonal axes of the cross-shaped vortices. The deformed vortical structures are stretched under the effect of the mean flow, discharging small vortices from the tips of corners through the cut-and-connect mechanism. The vortex stretching and the splitting to small vortices in the cross-shaped vortical structures are expected to enhance mixing significantly.
一般社団法人日本機械学会の論文
1989-10-25