不同间距比下串列双圆柱绕流的可视化实验  

Visualization Experiment on the Flow Characteristics of In-Line Cylinders for Different Spacings

作　　者：周杰[1] 邹帅[1] 喜冠南[1] ZHOU Jie ZOU Shuai XI Guan-nan(School of Mechanical Engineering, Nantong University, Jiangsu Nantong 226019, China)

机构地区：[1]南通大学机械工程学院,江苏南通226019

出　　处：《机械设计与制造》2017年第7期19-21,25,共4页Machinery Design & Manufacture

基　　金：国家自然科学基金资助项目(51176079)

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。In order to understand the characteristics of flow past two cylinders in tandem arrangement, the open cyclic water tunnel is designed. The experiments about flow characteristics of single cylinder and double circular cylinders for different spacings are studied using dyeing method and PIV system. Firstly, the stability of the experimental apparatus is proved. Then the visualization experiments of the single cylinder in different Reynolds number are done to compare with the results of the document,which can prove the correctness of the experimental apparatus. When Re=2OO,changing the spacing between in- line cylinders can get some conclusions ： When Ps 〈-3D, the wake flow of the upstream cylinder is stable laminar flow, while the wake flow of the downstream cylinder is unstable. While increasing the spacings between double circular cylinders, the wake flow of the upstream cylinder turns to be unstable, which can strengthen the instability of the downstream cylinder, that a rule of vortex shedding occurs at the wakeflow of the downstream cylinder.

关 键 词：循环水槽 染色法 粒子图像测速 单圆柱 双圆柱 尾流 

分 类 号：TH16[机械工程—机械制造及自动化] TK124[动力工程及工程热物理—工程热物理]