Experimental studies on coherent structures in jet entrainment boundary layers

ZHOU Lei; ZHOU Wu; GUO Yan ang; CAI Xiaoshu

doi:10.11949/0438-1157.20190048

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Experimental studies on coherent structures in jet entrainment boundary layers

Fluid dynamics and transport phenomena | 更新时间：2026-07-24

- Experimental studies on coherent structures in jet entrainment boundary layers
- CIESC Journal Vol. 70, Issue 7, Pages: 2520-2527(2019)
- 作者机构：
  
  上海理工大学颗粒与两相流测量研究所，上海 200093
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190048
  CLC： TQ 028.8
- Received：14 January 2019，
  
  Revised：2019-04-26，
  
  Online First：24 July 2026，
  
  Published：05 July 2019
- 稿件说明：
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周雷, 周骛, 郭延昂, 蔡小舒. 射流卷吸边界层内相干结构的实验研究[J]. 化工学报, 2019, 70(7): 2520-2527

ZHOU Lei, ZHOU Wu, GUO Yan’ang, CAI Xiaoshu. Experimental studies on coherent structures in jet entrainment boundary layers[J]. CIESC Journal, 2019, 70(7): 2520-2527
周雷, 周骛, 郭延昂, 蔡小舒. 射流卷吸边界层内相干结构的实验研究[J]. 化工学报, 2019, 70(7): 2520-2527 DOI： 10.11949/0438-1157.20190048.

ZHOU Lei, ZHOU Wu, GUO Yan’ang, CAI Xiaoshu. Experimental studies on coherent structures in jet entrainment boundary layers[J]. CIESC Journal, 2019, 70(7): 2520-2527 DOI： 10.11949/0438-1157.20190048.

摘要

在轴对称水射流实验台上，采用单帧长曝光图像法，测量了出口Reynolds数在1849~2509范围内的卷吸边界层内流场结构。发现在流向距离

~3.5

，径向距离

~1.25

的区域内，流场中吞噬作用和侵蚀作用两种卷吸模式交替出现。分析得到，当

1915时，吞噬作用所占的比例随着

的增大而增大，当

2311之后，Reynolds数对该结构发生概率的影响降低；通过快速傅里叶变换得到该相干结构发生的频率在10～19Hz之间；吞噬作用发生的同时在流场中观测到一些特殊涡结构。同时采用运动单帧长曝光图像法对射流流场进行拉格朗日法观测，发现射流流场中的涡结构一般存在于湍流与非湍流界面附近。

Abstract

On the axis-symmetric water jet test bench

the flow field structure in the entrainment boundary layer with the Reynolds number in the range of 1849－2509 was measured by the single-frame long exposure image method. It is found that engulfing and nibbling entrainment model occur intermittently with time

in the region of

－3.5

streamwise and

－1.25

radial direction. It concludes from analyzing that the occurrence probability of engulfing increases with Reynolds number when

1915

the influence of Reynolds number on the occurrence probability of this structure decreases when

2311.The occurrence frequency of this coherent structure obtained by fast Fourier transform is between 10 Hz and 19 Hz. Special vortex structures were observed in the flow field during the occurrence of engulfing. The jet flow field are measured using moving single frame long exposure image method in Lagrangian coordinate system

and it is found that the vortex structure generally existed near the interface of

turbulent regions and non-turbulent regions.

关键词

Keywords

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