溝付円柱の溝形状が及ぼす流動特性と抗力低減メカニズム

概要

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This paper describes the flow characteristics for a circular cylinder with grooves of different shapes. The purpose of this study is to clarify the surface structure in relation to the effectiveness of drag reduction, and the mechanism of drag reduction. Circular cylinders with 32 grooves in the direction of the span were used in this study. The grooves took one of three shapes (arc, triangle, or square). The pressure of the surface was measured with a semiconductor pressure transducer at Re=0.4×10^5〜3.9×10^5. The drag coefficient was calculated from the pressure distribution and by numerical analysis. The vortex shedding frequency at the wake flow area and the velocity near the surface were measured using a hot-wire anemometer. The flow characteristics near the surface were clarified by numerical analysis. It was clear that the drag coefficient is dependent on the shapes of the grooves.
東海大学の論文
2005-03-31