一様流中で振動する円柱まわりの流れ : 第2報,境界層の構造とはく離点近傍の流れ

概要

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The flow past a circular cylinder oscillating transversely in a uniform flow was investigated by flow visualization techniques. The frequency of the oscillating cylinder was set in the synchronized range in which the vortex sheds periodically with the same frequency of the oscillating cylinder. The experimental conditions were Re=1 100, and A/D=0.2, where Re is the Reynolds number based on the diameter D, and A the amplitude of the oscillation of the cylinder. The characteristic values (the displacement thickness, the shape factor, and the velocity at the outer edge of the boundary layer) were measured using hydrogen bubble techniques. From the values, the local skin friction on the cylinder was estimated with the oscillating phase angle during a cycle. The characteristics of the unsteady boundary layer near the separation points, where the dye filaments separate from the cylinder, are discussed in comparison with those of a steady one.
社団法人日本機械学会の論文
1988-09-25