平面壁上に直立する正方形平板突起からの放出渦構造 : 平面壁上の境界層が層流境界層の場合の可視化実験

概要

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The structure of the separation vortices shed from a square plate standing vertically on a flat ground wall where a laminar boundary layer was developing was examined by means of a visualization technique. The following results were obtained. The structure of the shedding vortex could be classified into four patterns in terms of both the Reynolds number Re_h and the ratio of plate height to boundary layer thickness h/δ. The four patterns were : a horseshoe-like trailing vortex, a pair of ordinary trailing vortices, a row of symmetrical hairpin vortices and a row of asymmetrical hairpin vortices. It seems that the vortex pattern is mainly affected by the location of a stagnation point on the front surface of the square plate.
1993-03-25