山东科学 ›› 2018, Vol. 31 ›› Issue (6): 50-54.doi: 10.3976/j.issn.1002-4026.2018.06.008

• 能源与动力 • 上一篇    下一篇

流体绕流微柱群的Micro-PIV实验研究

李永1 ,吕明明1* ,刘志刚1 ,祝叶2   

  1. 1. 齐鲁工业大学(山东省科学院),山东省科学院能源研究所,山东 济南 250014;2. 江苏省节能工程设计研究院有限公司,江苏 南京 210007
  • 收稿日期:2018-08-22 出版日期:2018-12-20 发布日期:2018-12-20
  • 通信作者: 吕明明 E-mail:lvmm@sderi.cn
  • 作者简介:李永(1986—),男,研究方向为节能技术研究。
  • 基金资助:

    山东省自然科学基金(ZR2016YL005,ZR2016EEB01);山东省重点研发计划(2018GGX104006);山东省科学院青年基金(2018QN0017)

Experimental study on flow past micro-cylinder-groups by Micro-PIV method

LI Yong1, LÜ Ming-ming1*, LIU Zhi-gang1, ZHU Ye2   

  1. 1.Energy Research Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China; 2.Jiangsu Design and Research Institute of Energy Conservation Engineering Limited Company, Nanjing 210007, China
  • Received:2018-08-22 Online:2018-12-20 Published:2018-12-20
  • Contact: Lü Ming-ming E-mail:lvmm@sderi.cn

摘要:

微柱群通道内的流动特性是设计与优化其散热结构的基础。采用显微粒子测速技术(Micro-PIV)对绕流微柱群流动进行研究,测定了不同Re下的绕流流场,分析了绕流微柱群的速度场以及Re对涡结构及回流长度的影响。结果表明,随着Re的增大,微圆柱尾流区出现涡结构,回流长度逐渐增大,微尺度下柱体绕流过程中边界层分离现象相对于宏观尺度具有一定的滞后性。

关键词: 圆柱绕流, Micro-PIV, 涡结构, 微柱群, 回流

Abstract:

The micro-cylinder-group is an efficient heat dissipation structure, which has great application prospects for solving the cooling problems in micro space. The flow characteristics in the channel with micro-cylinder-group are the foundation for the design and optimization of the heat dissipation structure. Micro particle image velocimetry (Micro-PIV) was used to study the flow past the micro-cylinder-group and the flow field around micro-cylinders with different Reynolds numbers was measured. The velocity field of the micro-cylinder-group and the effects of Reynolds number on the vortex structure and the backflow length were analyzed. The results show that vortex structure appears in the wake region of micro-cylinder and the backflow length increases gradually with the increase of Reynolds number. The boundary layer separation phenomenon in flow past the micro-cylinder has a certain lag compared with the macro-scale.

Key words: flow past cylinder, vortex structure, Micro-PIV, micro-cylinder-groups, backflow

中图分类号: 

  • TK124

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