Abstract
This paper describes an experimental study on the flow patterns and the characteristic of flow around a circular cylinder with grooves. The surface pressure when changing Reynolds number (Re=0.4×10^5〜4.2×10^5) measured with the circular cylinder with grooves of four kinds of grooves number (32, 48, 64, 96) Drag coefficient is calculated from the pressure distribution and the flow around the circular cylinder with grooves is investigated by hot wire and visualization. From the results, It is clarified that minimum drag coefficient shifts to high Reynolds number side as groove number increases. It turns out that wake area, separation point change and the drag coefficient is affected with the number of grooves.
