Abstract
This paper describes the flow characteristics around circular cylinder with arc grooves. In this study, cylinders with arc grooves of different depths are used. There are 32 grooves in the direction of the axis. Three pressure holes inside the grooves and one between a pair of grooves are prepared in order to measure the surface pressure around the cylinder. Drag and lift coefficient are calculated from the pressure distribution measured in the range of Reynolds number Re=0.35×(10)^5∿1.8×(10)^5. And the velocity distributions on the surface of the cylinders are measured by means of the hot wire. From these experimental results, the change of drag and lift coefficient to the depth of grooves and Reynolds number of the cylinder with arc grooves and effect of the grooves in decrease of drag are developed.
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