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首页> 外文期刊>Journal of visualization >The laminar horseshoe vortex upstream of a short-cylinder confined in a channel formed by a pair of parallel plates
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The laminar horseshoe vortex upstream of a short-cylinder confined in a channel formed by a pair of parallel plates

机译：短圆柱体上游的层状马蹄形涡流，其局限在由一对平行板形成的通道中

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摘要

A flow visualization experiment was performed in order to characterize the laminar horseshoe vortex system that appears upstream of the junction of a short cylinder and a pair of flat parallel plates. The experiments were performed in a water tunnel and the technique used for flow visualization was laser illumination of seeded particles whose traces were captured using long exposure photography. Geometrical and flow parameters, such as Reynolds number and height-to-diameter ratio of the cylinders, are varied during the experiments and the flow regimes are analyzed as a function of these parameters. The behavior of vortex systems is reported. For low Reynolds number cases, the vortices stay in a fixed position, as the Reynolds number is increased the number of vortices grows and for larger Reynolds numbers the vortex system becomes oscillatory and for further increases it becomes periodic. As for the dimensionless height of the cylinders, the vortex system is weak for short cylinders and increases its strength and number of vortices as the cylinder height-to-diameter ratio is increased. For further increases in height the vortex system do not change, which shows that the flow becomes independent of the height-to-diameter ratio for sufficiently tall cylinders. Information of the frequency of appearance of periodic vortices is also included.
机译：为了表征层状马蹄涡流系统，进行了流动可视化实验，该系统出现在短圆柱体和一对平坦的平行板的交界处的上游。实验是在水隧道中进行的，用于流动可视化的技术是激光照射种子颗粒，使用长时间曝光摄影可以捕获痕迹。在实验过程中会改变几何和流动参数，例如雷诺数和圆柱体的高径比，并根据这些参数分析流动方式。报告了涡旋系统的行为。对于低雷诺数的情况，涡流保持在固定位置，随着雷诺数的增加，涡流的数量会增加，而对于较大的雷诺数，涡流系统会变得振荡，而对于进一步的雷诺数，涡流系统将变为周期性。至于圆柱体的无量纲高度，对于短圆柱体，涡流系统较弱，并且随着圆柱体高度与直径之比的增加，涡流系统的强度和涡流数量会增加。为了进一步增加高度，涡流系统不会改变，这表明流量变得与高度足够大的圆柱体的高度与直径之比无关。还包括周期性涡旋出现频率的信息。

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