Abstract
The lift acting on a rotating cylinder placed in the flow is known as Magnus effect. In the previous studies, it is confirmed that the lift force is enhanced by adding fins to a rotating cylinder. However, the effect of fins on the lift force has not yet been fully clarified. In this study, wind tunnel tests were performed by using the three models (cylinder with no fins, cylinder with straight fins and cylinder with spiral fins) to investigate the mechanism of lift enhancement for a rotating cylinder with fins. The lift force increases for the rotating cylinder with spiral fins. To clarify the reasons why the spiral fins show the high lift, the smoke flow visualization and PIV (particle image velocimetry) method were carried out. For the spiral fins, the downwash was observed in the wake of the cylinder. Therefore, the lift force is enhanced for the rotating cylinder with spiral fins.
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