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首页> 外文期刊>Journal of visualization >Flow Characteristics around a Rotating Grooved Circular Cylinder with Grooved of Different Depths
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Flow Characteristics around a Rotating Grooved Circular Cylinder with Grooved of Different Depths

机译：带不同深度沟槽的旋转沟槽圆柱体的流动特性

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摘要

The present paper describes the flow characteristics around a rotating grooved circular cylinder with grooves of different depths. The surface structure of a circular cylinder was varied by changing the depths of 32 arc grooves on the surface. The surface pressure on the cylinder is measured for the Re range of from 0.4x10~5 to 1.8x10~5 and for rotations of from 0 to 4500 rpm. The drag coefficient of a grooved cylinder increases as the spin rate ratio a (= rotational speed of the cylinder surface/uniform velocity) increases for Re > 1.0x10~5. As the groove depth increases, the drag coefficient of a grooved cylinder is independent from the spin rate ratio α. The direction of the lift force of a smooth cylinder is opposite to the Magnus force for Re > 1.0x10~5. However, the direction of the lift force of a grooved cylinder is the same as that of the Magnus force for all Re > 1.0x10~5. As the groove depth increases, the increase in the slope of the lift coefficient becomes small. These phenomena are related to the positions of the flow separation points, which are clarified from the pressure distribution and flow visualization by the spark tracing method. In addition, in the present study, the flow around a rotating grooved cylinder is clarified by flow visualization.
机译：本文描述了具有不同深度的凹槽的旋转凹槽圆柱体周围的流动特性。通过改变表面上的32个弧形凹槽的深度来改变圆柱体的表面结构。测得的圆柱体表面压力的Re范围为0.4x10〜5至1.8x10〜5，旋转范围为0至4500 rpm。当Re> 1.0x10〜5时，带槽圆柱体的阻力系数随着旋转速率比a（=圆柱体表面的转速/均匀速度）的增加而增加。随着槽深度的增加，带槽圆柱体的阻力系数与旋转速率比α无关。当Re> 1.0x10〜5时，光滑圆柱体的提升力方向与马格努斯力相反。但是，当Re> 1.0x10〜5时，带槽圆柱体的升力方向与马格努斯力相同。随着槽深度的增加，升力系数的斜率的增加变小。这些现象与流分离点的位置有关，通过火花跟踪方法从压力分布和流可视化可以明确这些现象。另外，在本研究中，通过流动可视化可以清楚地阐明围绕旋转槽缸的流动。

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