303 静止流体中で自由落下する平板周りの渦流れに関する研究(2)(OS3-1 噴流,後流,せん断流の構造・普遍的特性(後流1),OS3噴流,後流,せん断流の構造・普遍的特性)

概要

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In this study, we studied flow around a freely falling flat plate, especially focusing on the autorotating motion, by experiment using high speed camera and numerical simulation by discrete vortex method. The computed result agree well with the experiment and it was found that the trajectory of the plate is almost linear but fluctuate, especially, in the region where the plate turn around. Experimental result show that the effect of the aspect ratio L/W becomes large in the region L/W<4.2 and in this region, the rotation frequency increases as L/W increases. The computed result show the relation between flow pattern and fluid dynamic forces and the comparison with calculation of the falling plate with forced rotation founds that the interaction between plate motion and fluid dynamic force appear in the region θ=0°〜θ=90°.
一般社団法人日本機械学会の論文
2007-11-17