多線式メッキ煙線法による乱流場の瞬間像の解析 : 流体工学,流体機械

概要

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A new smoke-wire technique was examined to get quansitative information of turbulent flow fields from visualization photographs. Smoke emission on the smoke-wire was regulated by partially plating to give it locally different Joule heating. The smoke streaks emitted from unplated points of the wire captured the flow characteristics quite clcarly. When the small delay time between the smoke emission and the exposure was given, smoke streaks directly indicated velocity vectors at each point in the flow field. A smoke-wire grid composed of 20 partially plated smoke-wires was installed behind a circular cylineder and a delta-wing. Conditional visualization was conducted to clarify the behavior of coherent vortices behind the circular cylinder based on a velocity signal from a reference hot-wire probe filtered at the vortex shedding frequency. Phase-averaged velocity vectors and vorticity fields were calculated from the conditioned smoke streaks in the wake of the cylinder and the trajectories of the coherent vortices were determined.
社団法人日本機械学会の論文
2001-09-25