渦構造の操作による非円形噴流の制御に関する研究

概要

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Noncircular jets were investigated experimentally by manipulating the vortical structures under controlled excitation, and the effects of the mixing enhancement were discussed in relation to the dynamics of vortical structures. The experiments were carried out for the air jets issuing from sharp-edged circular, square, triangular and rectangular orifices. The jets were excited at two modes of the stable vertical structures: the deformation mode and the interaction mode. The mean-velocity contours measured by the hot-wire anemometer exactly correspond to the vertical structures. The jet diffusion increases significantly by enhancing the noncircular vertical structures especially at the interaction mode. The results suggest that the intense stretching and the splitting of the vertical structures are key mechanism to enhance entertainment and mixing in the noncircular jets.
一般社団法人日本機械学会の論文
1992-01-25