一様流中平板リング後流における厚み効果(安定性・乱流境界層・せん断流・遷移(1),一般講演)

概要

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The present aim is to clarify the wake structure past a ring which is immersed perpendicularly to mainstream. In a wind tunnel, we carry out flow visualisation and the measurement using a hot-wire anemometer. Flow is visualised by a smoke-wire method, and we take consecutive picutures using a high-speed camcorder. Analyses of these pictures by a PIV technique bring us quantitative flow-field information, such as velocity vectors and vorticity-denseness distribution. The present tested range is Re=2.0×10^3-5.0×10^3, d/w=4.0-10.0, and t/w=1.0-10.0, where Re, d, w and t are the Reynolds number, mean diameter, cross-section width and cross-section thickness of the ring, respectively. We focus our attention upon both periodicity and axisymmetry of the flow. To conclude, we classify the flow into three: (1) a periodical and axisymmetrical mode, (2) a periodical and less-axisymmetrical mode and (3) a non-periodical and less-axisymmetrical mode.
日本流体力学会の論文
2009-09-02