不同间距比下串列双圆柱绕流的可视化实验

发布时间：2018-01-08 11:11

本文关键词：不同间距比下串列双圆柱绕流的可视化实验　出处：《机械设计与制造》2017年07期 　论文类型：期刊论文

【摘要】：为了研究串列双圆柱绕流规律,针对本实验设计了开式循环水槽,将染色法及粒子图像测速(PIV)系统相结合,对不同雷诺数下的单圆柱、不同间距比的串列双圆柱绕流进行定量及定性的可视化实验。首先验证实验装置的稳定性,然后对不同雷诺数下的单圆柱绕流进行可视化实验,将实验数据与文献数据对比,验证实验装置的正确性。Re=200时,得出以下实验结论:当中心距Ps≤3D时,上游圆柱的尾流呈现出稳态,而下游圆柱的尾流是非稳态;增大间距,上游圆柱的尾流逐渐由稳态变成非稳态,并且这种非稳态将会加强下游圆柱尾流的非稳态,随后下游圆柱后端出现有规则的涡脱现象。
[Abstract]:In order to study the regularity of flow around two circular cylinders in tandem, the experimental design of open circulating water channel, the staining method and particle image velocimetry (PIV) system based on different Reynolds number of Dan Yuanzhu, to carry out quantitative and qualitative visualization of flow around two circular cylinders in tandem with different spacing ratio. First verify the stability of the experimental device. Then the single cylinder at different Reynolds number flow visualization experiment, the comparison between experimental data and literature data, the correctness of the.Re=200 experiment device, the following conclusions: when the center distance of Ps is less than or equal to 3D, the upstream cylinder wake showed a steady state, while the downstream cylinder wake flow is unsteady; increasing the distance, the upstream cylinder wake gradually from the steady state into a non steady state, and the non steady state will strengthen the downstream cylinder wake flow, then the rules of the downstream cylinder rear vortex shedding phenomenon.

【作者单位】：南通大学机械工程学院;
【基金】：国家自然科学基金资助项目(51176079)
【分类号】：O357.5
【正文快照】： 1引言圆柱绕流现象普遍,探究领域广,管壳式换热器[1-4]、核电站、海上石油钻井平台等都与圆柱绕流有关,所以研究圆柱绕流的相关特性及水动力规律对实际运用能起到关键性的作用。众所周知,当经过圆柱的来流速度逐渐变大时,尾迹会形成有规律的漩涡脱落,这就是著名的卡门涡街[5]

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