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基于时间解析PIV的圆柱绕流尾迹特性研究

王勇 郝南松 耿子海 王万波

王勇, 郝南松, 耿子海, 等. 基于时间解析PIV的圆柱绕流尾迹特性研究[J]. 实验流体力学, 2018, 32(1): 64-70. doi: 10.11729/syltlx20170099
引用本文: 王勇, 郝南松, 耿子海, 等. 基于时间解析PIV的圆柱绕流尾迹特性研究[J]. 实验流体力学, 2018, 32(1): 64-70. doi: 10.11729/syltlx20170099
Wang Yong, Hao Nansong, Geng Zihai, et al. Measurements of circular cylinder's wake using time-resolved PIV[J]. Journal of Experiments in Fluid Mechanics, 2018, 32(1): 64-70. doi: 10.11729/syltlx20170099
Citation: Wang Yong, Hao Nansong, Geng Zihai, et al. Measurements of circular cylinder's wake using time-resolved PIV[J]. Journal of Experiments in Fluid Mechanics, 2018, 32(1): 64-70. doi: 10.11729/syltlx20170099

基于时间解析PIV的圆柱绕流尾迹特性研究

doi: 10.11729/syltlx20170099
基金项目: 

国家自然科学基金 11602290

振动与噪声控制技术 51334060301

详细信息
    作者简介:

    王勇(1982-), 男, 四川成都人, 博士, 助理研究员。研究方向:气动声学。通信地址:四川省绵阳市中国空气动力研究与发展中心(621000)。E-mail:nudt604@aliyun.com

    通讯作者:

    王勇, E-mail:nudt604@aliyun.com

  • 中图分类号: V211.7

Measurements of circular cylinder's wake using time-resolved PIV

  • 摘要: 采用时间解析PIV(采样频率为1000Hz)在0.55m×0.4m声学风洞中测量了直径D=20mm圆柱后方7.5倍直径、圆柱两侧各3.3倍直径所围成范围内的绕流尾迹在雷诺数Re=2.74×104下的非定常流场。针对PIV获得的速度场数据,进行流场和频谱特性分析,探讨了圆柱绕流尾迹中的平均流场和脉动流场特性,以及旋涡脱落的频率特性。提出了基于速度场之间相关性的相位平均分析方法,系统分析了圆柱上下两侧旋涡交替生成、脱落、发展并耗散的完整演化过程。结果表明:在圆柱后方存在一个低速回流区,其中心0.8D的位置附近是流动结构变化最剧烈的区域;圆柱后方1.9D位置附近是上/下两侧脱落旋涡交汇、耦合的区域,湍流脉动最强;圆柱绕流尾迹中,旋涡脱落频率对应的斯特劳哈尔数稳定在0.2左右;基于速度场之间相关性的相位平均分析方法简单有效,可以准确地识别绕流尾迹中旋涡交替脱落和发展的时空演化过程,在非定常流场测量方面具有普遍推广意义。
  • 图  1  实验设置示意图(俯视图)

    Figure  1.  Sketch of the experimental setup (top view)

    图  2  平均速度场的流线图

    Figure  2.  Mean streamlines

    图  3  平均速度场的归一化涡量图和旋转强度图

    Figure  3.  Normalized mean vorticity field and swirling strength

    图  4  脉动速度场的湍动能和归一化雷诺剪切应力

    Figure  4.  Turbulent kinetic energy and normalized Reynolds shear stress

    图  5  斯特劳哈尔数云图

    Figure  5.  Contours of the Strouhal number

    图  6  速度场之间的相关性分析

    Figure  6.  Cross-correlation analysis of the velocity fields

    图  7  相位平均流线图

    Figure  7.  Phase-averaged streamlines

    图  8  相位平均涡量场

    Figure  8.  Phase-averaged vorticity fields

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出版历程
  • 收稿日期:  2017-08-02
  • 修回日期:  2017-11-20
  • 刊出日期:  2018-02-25

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