The scale and circulation characteristics of spanwise vortexes in open channel flows

Zhong Qiang; Chen Qi-gang

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The scale and circulation characteristics of spanwise vortexes in open channel flows

更新时间：2023-11-14

- The scale and circulation characteristics of spanwise vortexes in open channel flows
- Advanced Engineering Sciences Vol. 45, Issue Z2, Pages: 66-70(2013)
- 作者机构：
  
  清华大学水沙科学与水利水电工程国家重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2013，
  
  Published Online：5 February 2013，
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钟强,陈启刚,李丹勋,王兴奎.明渠湍流横向涡旋的尺度与环量特征[J].工程科学与技术,2013,45(Z2):66-70.

Zhong Qiang, Chen Qi-gang. The scale and circulation characteristics of spanwise vortexes in open channel flows. [J]. Advanced Engineering Sciences 45(Z2):66-70(2013)
钟强,陈启刚,李丹勋,王兴奎.明渠湍流横向涡旋的尺度与环量特征[J].工程科学与技术,2013,45(Z2):66-70. DOI：

Zhong Qiang, Chen Qi-gang. The scale and circulation characteristics of spanwise vortexes in open channel flows. [J]. Advanced Engineering Sciences 45(Z2):66-70(2013) DOI：

摘要

中文摘要: 为了分析明渠湍流中横向涡旋的尺度与动力学特征，利用自主研发的高频粒子图像测速系统测量了6种水流条件下的明渠恒定均匀流时间序列流场，使用涡旋提取方法识别涡旋，提出一套简洁客观的涡旋尺度及环量确定方法，分析了明渠湍流横向涡半径与环量的特征。涡旋的无量纲尺度与强度仅与所在位置有关，与雷诺数等其它因素均无关系。从壁面附近至对数区的上边界，涡旋的平均半径增大。受水面影响，半水深以上的涡旋半径有逐渐减小的趋势。在粘性作用下，涡旋的平均环量由壁面至水面总体呈减小趋势。时均剪切对逆向涡旋的尺度与强度均有抑制作用，其平均尺度与环量在全水深均小于正向涡。

Abstract

Abstract:For analyzing the scale and dynamics characteristics of spanwise vortexes in open channel flows

instantaneous velocities were measured with high-speed PIV in steady uniform flow at 6 cases. Vortex extraction method was employed to identify vortexes and a simple and objective method was proposed to analyze the radii and circulation characteristics of spanwise vortexes. The scale and circulation of the vortex is only related to the location

and there was no relationship with the Reynolds number or other factors. The mean scale of vortex increases from near wall to the upper boundary of log layer. By the suppression of free surface

the vortex radius gradually decreases above half of the water depth. The average circulation of the vortex generally decreases from the wall to the free surface due to the effect of viscous. The scale and intensity of retrograde vortex are both inhibited by the mean shear

and its average radii and circulation are less than the prograde vortex in the full field.

关键词

明渠湍流横向涡旋尺度环量PIV

Keywords

open channel flowsspanwise vortexscalecirculationPIV

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Related Institution

School of Civil Eng., Beijing Jiaotong Univ.

State Key Lab. of Hydroscience and Eng., Tsinghua Univ.

College of Water Resources and Civil Eng., China Agricultural Univ.

四川大学水力学与山区河流开发保护国家重点实验室四川

上海电机学院机械学院上海

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