1666 静止空気中で自由落下する平板の自動回転運動に関する研究(G05-11 翼,G05 流体工学)

概要

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When a thin flat pate is released in still air, the plate sometimes falls aslant and automatically set into a rotational motion. This phenomenon is called autorotation. In this study, we calculated flow around an freely falling flat plate by the discrete vortex method. The computation could predict autoroation of the plate. The trajectory, especially at turning point of the plate where the plate slightly rises, agreed with the one obtained by experiment by using high speed camera. The flow pattern which repeat periodically every half cycle of the plate rotation were visualized and fluid-dynamic force acting on the plate were estimated. It was found that the effect of vortex shedding and the rotation of the plate contribute to the variation of the unsteady fluid-dynamic forces and the characteristic is the same as the result in the case that the rotation frequency and falling velocity were fixed at the average value.
一般社団法人日本機械学会の論文
2007-09-07