前端エッジに切り落としを有する縦横比１以下の矩形柱まわりの流れの可視化実験―抗力軽減メカニズムの検討―:－抗力軽減メカニズムの検討－

概要

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The purpose of this paper is to investigate a mechanism on drag reduction of a rectangular cylinder with small cut-corners at the front-edge. The rectangular shape is selected in three kinds of the length-to-breadth ratios: 2/6, 4/6 and 6/6. The visualization techniques include the hydrogen-bubble technique for Re=4,000 and the X-type hot wire anemometer in a wind tunnel for Re=50,000. A similar reattachment flow pattern is observed, although the length-to-breadth ratio is less than unity, in two values of the Reynolds number between 4,000 and 50,000. This implies that the drag reduction would occur even for a separated laminar shear layer if one selects an appropriate shape of the cut-corner unlike the previous findings.
日本実験力学会の論文