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开缝圆柱缝隙倾斜角对脱落涡的影响

刘志荣 邹赫 刘锦生 鲍锋 朱睿

刘志荣, 邹赫, 刘锦生, 等 . 开缝圆柱缝隙倾斜角对脱落涡的影响[J]. 北京航空航天大学学报, 2017, 43(1): 128-135. doi: 10.13700/j.bh.1001-5965.2016.0058
引用本文: 刘志荣, 邹赫, 刘锦生, 等 . 开缝圆柱缝隙倾斜角对脱落涡的影响[J]. 北京航空航天大学学报, 2017, 43(1): 128-135. doi: 10.13700/j.bh.1001-5965.2016.0058
LIU Zhirong, ZOU He, LIU Jinsheng, et al. Effect of angle of slit on shedding vortex of slotted circular cylinder[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(1): 128-135. doi: 10.13700/j.bh.1001-5965.2016.0058(in Chinese)
Citation: LIU Zhirong, ZOU He, LIU Jinsheng, et al. Effect of angle of slit on shedding vortex of slotted circular cylinder[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(1): 128-135. doi: 10.13700/j.bh.1001-5965.2016.0058(in Chinese)

开缝圆柱缝隙倾斜角对脱落涡的影响

doi: 10.13700/j.bh.1001-5965.2016.0058
基金项目: 

国家自然科学基金面上项目 11072206

福建省科学基金 2012J01023

详细信息
    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

    通讯作者:

    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。E-mail:zhurui@xmu.edu.cn

  • 中图分类号: O357

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

Funds: 

The General Program of National Natural Science Foundation of China 11072206

Science Foundation of the Fujian Province, China 2012J01023

More Information
  • 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。

     

  • 图 1  实验水槽

    Figure 1.  Experiment water channel

    图 2  实验模型

    Figure 2.  Experimental model

    图 3  实验模型及激光切面安装位置

    Figure 3.  Mounting position of experimental model andlaser section

    图 4  Red=5 837时缝隙内部流动

    Figure 4.  Fluid flow in slit-vent at Red=5 837

    图 5  PIV数据坐标系

    Figure 5.  Coordinate system of PIV data

    图 6  β=90°时不同Red下环量发展变化曲线

    Figure 6.  Circulation development curves at differentRed when β=90°

    图 7  β=90°时不同Red下的频谱图

    Figure 7.  Spectrogram at different Red when β=90°

    图 8  基准圆柱一个周期内的流态

    Figure 8.  Fluid flow of a base cylinder in a period

    图 9  s/d=0.10的开缝圆柱一个周期内的流态

    Figure 9.  Fluid flow of a slotted cylinder with s/d=0.10 in a period

    图 10  s/d=0.15的开缝圆柱一个周期内的流态

    Figure 10.  Fluid flow of a slotted cylinder with s/d=0.15 in a period

    图 11  开缝圆柱示意图

    Figure 11.  Sketch of circular cylinder with a slit

    图 12  St变化曲线在β=70°~90°

    Figure 12.  St development curves at β=70°-90°

    图 13  β=90°,85°,80°一个周期内的流态

    Figure 13.  Fluid flow of a slotted cylinder in a period at β=90°,85°,80°

    表  1  PIV系统参数

    Table  1.   PIV system parameters

    组件型号参数及数值
    激光最大输出功率15 W,波长532 nm
    相机SpeedSense 90401 632像素×1 200像素
    镜头Micro-Nikkor焦距55 mm
    处理软件Dynamic Studio V3.40
    示踪粒子 PSP粒子直径20 μm
    下载: 导出CSV

    表  2  开缝圆柱尺寸参数

    Table  2.   Geometrical parameters of slotted cylinder

    参数数值
    d/mm40
    l/mm440
    d/l11
    s/mm4,6
    s/d0.10,0.15
    α/(°)8.63
    注:d/l为长宽比;α=arcsin(s/d)为开缝角度。
    下载: 导出CSV

    表  3  不同u下的Red、 f和St

    Table  3.   Red,f and St at different u

    u/(m·s-1)0.0350.0700.1000.1450.180
    Red1 3932 7863 9805 7717 164
    f/Hz0.1960.3930.5660.8221.020
    St0.2240.2250.2260.2270.227
    下载: 导出CSV
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出版历程
  • 收稿日期:  2016-01-18
  • 录用日期:  2016-01-27
  • 刊出日期:  2017-01-20

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