105 円弧状溝付回転円柱まわりの流動特性

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This paper is described on the flow characteristics around the rotating cylinder with arc type grooves. The lift and drag on a smooth cylinder and cylinders with arc type grooves in a uniform flow are measured within the Reynolds number range 0.2×(10)^5≤Re≤1.8×(10)^5 with 0 to 4000rpm rotation in a wind tunnel. For the smooth cylinder, lift thirst increases as the spin rate ratio increases. However, as the spin rate ratio further increases, the lift decreases, and then a negative lift occurs when spin rate ratio α=0.4 to 0.5. After the lift reaches the minimum value, it increases again as the spin rate ratio increases. In contrast, drag decreases until the spin rate ratio reaches 1.0 for the smooth cylinder. In the case of a circular cylinder with grooves lift, it simply increased without decrease against the spin rate unlike the case of a smooth cylinder. These phenomena were clarified through analysis of the distribution of average pressure around a rotating cylinder and visualization of the flow patterns around the cylinder by the spark tracing method.
社団法人日本機械学会の論文
2002-10-05