平板境界層内に直立する薄板の下流における流速分布

概要

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An unexpected velocity distribution was found in the downstream field of a thin plate set upright on a flat wall. A steep velocity peak was detected behind the thin plate in the boundary layer of the flat wall with I-type hot-wire anemometer. The flow visualization with dye technique and a numerical analysis with Navier-Stokes equation were performed to clearly grasp the flow field around the thin plate. A horseshoe vortex was formed around the thin plate, and its two streamwise legs approached each other just behind the trailing edge. These vortices induced a strong downwash and drew the fluids with large velocity toward the flat wall. A velocity peak was thereby generated behind the thin plate. A pair of tornado-type vortices was observed on the trailing edge surface of the thin plate. The fluids near the flat wall were sucked up by these vortices and released at a height in the mean flow region.
社団法人日本機械学会の論文
1994-06-25