1313 ノズル出口擾乱が衝突噴流の渦構造に与える影響について

概要

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Three-dimensional organized structures of the plane and round impinging jets were investigated by the visualized images obtained by DNS. We especially focused on the effect of the spanwise of azimuthal disturbances imposed at the inlet velocity on the eddy structures. Three wavelength of λ/πD=1/3,1/4 and 1/6 were tested in this study, where D is the width or the diameter of the inlet nozzle. The round jet showed definite instability at λ/πD=1/6 while the plane jet was found to show almost equivalent sensitivity to all modes tested here. As regards the eddy structures at the stagnation region, famous twin vortices along the impinging plate of plane jets were reproduced and their number of pairs were found to agree well with the spanwise wave number imposed at the inlet.
一般社団法人日本機械学会の論文
2002-09-20