Effects of the Channel Height on the Flow Past a Circular Cylinder : On the Nearcritical Flow

概要

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An experimental study has been conducted to explore the effects of the channel height on the subcritical, critical, or supercritical flow past a circular cylinder by changing the ratio d/h of the cylinder diameter to the channel height. The pressure and velocity distributions around the circular cylinder were measured under various conditions, and the Strouhal numbers were examined also. It was found that the pressure coefficient distribution on the cylinder surface changed largely with d/h, and the drag coefficient obtained form this pressure coefficient distribution increased with d/h. The observed Strouhal number increased with d/h and the critical Reynolds number shifted to a lower value as d/h increased. By comparing the results of the present study with those of previous studies, the drag coefficient predicted by using one of Allen-Vincenti's equations was found to be different from that experimentally obtained at any finite value of d/h for a flow under nearcritical conditions.
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