北京航空航天大学学报 ›› 2017, Vol. 43 ›› Issue (1): 128-135.doi: 10.13700/j.bh.1001-5965.2016.0058

• 论文 • 上一篇    下一篇

开缝圆柱缝隙倾斜角对脱落涡的影响

刘志荣1, 邹赫1, 刘锦生2, 鲍锋1, 朱睿1   

  1. 1. 厦门大学 航空航天学院, 厦门 361005;
    2. 清华大学 航天航空学院, 北京 100084
  • 收稿日期:2016-01-18 出版日期:2017-01-20 发布日期:2016-04-13
  • 通讯作者: 朱睿,E-mail:zhurui@xmu.edu.cn E-mail:zhurui@xmu.edu.cn
  • 作者简介:刘志荣,男,硕士,工程师。主要研究方向:实验流体力学、流动控制;朱睿,男,博士,讲师,硕士生导师。主要研究方向:实验流体力学、流动控制、民航安全。
  • 基金资助:
    国家自然科学基金面上项目(11072206);福建省科学基金(2012J01023)

Effect of angle of slit on shedding vortex of slotted circular cylinder

LIU Zhirong1, ZOU He1, LIU Jinsheng2, BAO Feng1, ZHU Rui1   

  1. 1. School of Aeronautics and Astronautics, Xiamen University, Xiamen 361005, China;
    2. School of Aeronautics Engineering, Tsinghua University, Beijing 100084, China
  • Received:2016-01-18 Online:2017-01-20 Published:2016-04-13
  • Supported by:
    The General Program of National Natural Science Foundation of China (11072206); Science Foundation of the Fujian Province, China (2012J01023)

摘要: 开缝圆柱绕流作为钝体绕流研究的分支,具备很强的应用前景,但是对其复杂的流动现象的物理本质的理解仍不完善。本文采用流动显示技术和粒子成像测速技术(PIV),探究缝隙对开缝圆柱流场结构的影响,在数据处理方面采用本征正交分解(POD)方法对开缝圆柱流场信息进行了重建。实验研究表明:在一定雷诺数范围内,开缝圆柱缝隙的存在从根本上改变了圆柱绕流近区尾流的结构;开缝圆柱脱落涡的脱落频率对开缝圆柱缝隙倾斜角具有一定的敏感性,随着缝隙倾斜角的增大其斯特劳哈尔数逐渐变大,对比发现开缝圆柱狭缝比(缝隙/直径)为0.15时较0.10的斯特劳哈尔数具有更强的稳定性。

关键词: 开缝圆柱, 脱落涡, 粒子成像测速技术 (PIV), 本征正交分解 (POD), 斯特劳哈尔数

Abstract: Vortex shedding from a circular cylinder with a slit which belongs to the unsteady flow of bluff bodies has very strong application prospects. However, it is still difficult to fully understand the complex flow phenomenon. Using flow visualization and particle image velocimetry (PIV) measurement, we explored the influence of a slit on the flow field structure. Adopting the method of proper orthogonal decomposition (POD), we reconstructed the flow field in the series of operations on PIV data. The experimental results show that the flow in the slit demonstrates periodic motion, and this oscillating vent-flow greatly alters the near wake flow features within a certain range of Reynolds number. Shedding vortex frequency of slotted cylinder has certain sensitivity with the angle of slit. The Strouhal number increases gradually with the increase of the angle, and the Strouhal number of slit ratio (slit/diameter) equals to 0.15 is more stable than that of slit ratio equals to 0.10.

Key words: slotted circular cylinder, shedding vortex, particle image velocimetry (PIV), proper orthogonal decomposition (POD), Strouhal number

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