G141 リング設置による円柱の抗力軽減(G-14 せん断流れ(4),一般講演)

概要

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The present experiment demonstrated an omni-directional reduction of drag and fluctuating forces of a circular cylinder to the cross-flow by attaching cylindrical rings, which were spaced several diameters along the span of the cylinder. The Reynolds number based on the diameter of the base cylinder, Re_d, ranged from 3000 to 38000. For Re_d≥20000, the drag force was reduced by 15% for the optimum configuration of the rings although the projected area to the flow increased. This was caused by the formation of the separation bubbles on both sides of the rings, leading to a highly three-dimensional feature in the flow behind the cylinder. The fluctuating lift, which was estimated from fluctuating surface pressures, was much suppressed over the Reynolds numbers examined herein due to the suppression of the two-dimensional vortex shedding.
日本流体力学会の論文
2004-08-09