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湍流边界层外区超大尺度相干结构相位平均波形

白建侠 郑小波 姜楠

白建侠, 郑小波, 姜楠. 湍流边界层外区超大尺度相干结构相位平均波形[J]. 实验流体力学, 2016, 30(5): 1-8. doi: 10.11729/syltlx20160064
引用本文: 白建侠, 郑小波, 姜楠. 湍流边界层外区超大尺度相干结构相位平均波形[J]. 实验流体力学, 2016, 30(5): 1-8. doi: 10.11729/syltlx20160064
Bai Jianxia, Zheng Xiaobo, Jiang Nan. Phase-averaging waveforms of superstructures in outer layer of turbulent boundary layer[J]. Journal of Experiments in Fluid Mechanics, 2016, 30(5): 1-8. doi: 10.11729/syltlx20160064
Citation: Bai Jianxia, Zheng Xiaobo, Jiang Nan. Phase-averaging waveforms of superstructures in outer layer of turbulent boundary layer[J]. Journal of Experiments in Fluid Mechanics, 2016, 30(5): 1-8. doi: 10.11729/syltlx20160064

湍流边界层外区超大尺度相干结构相位平均波形

doi: 10.11729/syltlx20160064
基金项目: 

国家自然科学基金项目 11272233

国家自然科学基金项目 11332006

国家自然科学基金项目 11471167

国家自然科学基金项目 11572221

国家重点基础研究发展计划(973)课题 2012CB720101

国家重点基础研究发展计划(973)课题 2012CB720103

详细信息
    作者简介:

    白建侠(1982-), 女, 河北沧州人, 博士研究生。研究方向:实验流体力学。通信地址:天津市团泊新城博学苑天津大学仁爱学院(301636)。E-mail:jianxiabai@yeah.net

    通讯作者:

    姜楠, E-mail:nanj@tju.edu.cn

  • 中图分类号: O357.5

Phase-averaging waveforms of superstructures in outer layer of turbulent boundary layer

  • 摘要: 用IFA300恒温式热线风速仪和X形二分量热线探针精细测量了风洞中平板湍流边界层不同法向位置的瞬时流向、法向速度分量的时间序列信号。通过对不同速度分量进行子波变换,得到了近壁区和外边界区流向和法向脉动速度分量的分尺度湍动能随尺度的分布,在外边界区发现流向脉动速度和法向脉动速度的能量最大尺度随法向坐标远离壁面增大,相干结构的平均猝发周期也相应增加,说明在外区存在超大尺度的相干结构。采用条件采样和相位平均技术,提取了近壁区和外边界区能量最大尺度相干结构流向及法向速度的喷射和扫掠的条件相位平均波形,发现流向和法向脉动速度及雷诺应力喷射和扫掠事件的条件相位波形较近壁区都发生了改变。雷诺应力负的幅值显著降低,雷诺应力表现为正负交替的波动现象。
  • 图  1  实验装置示意图

    Figure  1.  Schematic diagram of the experimental setup

    图  2  平板湍流边界层平均速度剖面

    Figure  2.  Mean velocity profile of turbulent boundary layer

    图  3  近壁区和外区流向及法向速度信号的子波系数等值线图

    Figure  3.  Wavelet coefficient contour of streamwise velocity component and normal velocity component in the near-wall and outer region

    图  4  流法向脉动速度近壁区和外区能量随尺度分布线图

    Figure  4.  Fluctuating kinetic energy distribution of streamwise velocity and normal velocity component in the near-wall and outer region

    图  5  近壁区不同法向位置流向及法向脉动速度喷射扫掠事件的条件相位平均波形

    Figure  5.  Phase-averaging waveforms of streamwise velocity and normal velocity components in the near-wall region at ejection and sweep events

    图  6  外区不同法向位置流向及法向脉动速度喷射扫掠事件的条件相位平均波形

    Figure  6.  The phase-averaging waveforms of the streamwise velocity and normal velocity components in the outer region

    图  7  近壁区不同法向位置雷诺应力喷射扫掠事件的条件相位平均波形

    Figure  7.  The phase-averaging waveforms of Reynolds shear stress in the near-wall region at ejection and sweep events

    图  8  外区不同法向位置雷诺应力喷射扫掠事件的条件相位平均波形

    Figure  8.  The phase-averaging waveforms of Reynolds shear stress in the outer region at ejection and sweep events

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出版历程
  • 收稿日期:  2016-04-18
  • 修回日期:  2016-06-16
  • 刊出日期:  2016-10-25

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