Vortex Identification in the Flow Field of Opposed Jet-Vents in Occupied Enclosure

Lu Haoyang; Wang Congcong; Chen Hongbing; Zhang Yan; Li Chunyang; Liu Yuhang; Zhao Liguo

doi:10.12465/j.issn.0253-4339.2025.01.140

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Vortex Identification in the Flow Field of Opposed Jet-Vents in Occupied Enclosure

更新时间：2025-01-23

- Vortex Identification in the Flow Field of Opposed Jet-Vents in Occupied Enclosure
- Journal of Refrigeration Vol. 46, Issue 1, Pages: 140-149(2025)
- 作者机构：
  
  1.北京建筑大学环境与能源工程学院　北京　 102616
  2.北京市高强混凝土有限责任公司　北京　 100071
- 作者简介：
  
  Wang Congcong, male, lecturer, School of Environment and Energy Engineering, Beijing University of Civil Engineering and Architecture, 86-18222202285, E-mail: wangcongcong@bucea.edu.cn. Research fields: indoor environmental quality and green energy in buildings.
- 基金信息：
  
  Beijing Science and Technology Project(Z231100006123014);Beijing Municipal Committee Organization Department Youth Backbone Talent Program(24269220005;Z231100006123014)
- DOI：10.12465/j.issn.0253-4339.2025.01.140
  CLC： TU834
- Received：27 October 2023，
  
  Revised：17 December 2023，
  
  Accepted：2024-01-16，
  
  Published：16 February 2025
- 稿件说明：
移动端阅览
Lu Haoyang, Wang Congcong, Chen Hongbing, et al. Vortex Identification in the Flow Field of Opposed Jet-Vents in Occupied Enclosure[J]. Journal of refrigeration, 2025, 46(1): 140-149.
DOI：

Lu Haoyang, Wang Congcong, Chen Hongbing, et al. Vortex Identification in the Flow Field of Opposed Jet-Vents in Occupied Enclosure[J]. Journal of refrigeration, 2025, 46(1): 140-149. DOI： 10.12465/j.issn.0253-4339.2025.01.140.

摘要

在由多个对置射流风口所构成的封闭人居环境内，对涡旋结构的认识对遏制病毒和污染物传播起到至关重要的作用。搭建了对置射流封闭人居空间的缩比模型，使用PIV（particle image velocimetry）系统对等温条件和冷却条件下的流场进行测量。在涡的视角下对流场的湍流特性进行研究，对比了不同的涡识别算法的识别效果。筛选出Liutex涡识别方法对一个摆动周期内的涡旋运动进行分析，发现逆时针和顺时针方向涡旋强度不同，最大强度分别为50 s

-1

和110 s

-1

，得出涡旋的运动、合并、湮灭会对流场结构产生影响，射流摆动的周期约为3.67 s。由于涡对污染物具有锁定作用，通过涡心相对频率分布图表示污染物聚集的区域，分析得出虽然流场是非定常的，但涡的分布却相对稳定，其中CS4截面左侧涡心在同一点出现的次数高达21次。在冷却条件下污染物被锁定在更小的区域，这有助于遏制污染物的传播。

Abstract

In an occupied enclosure space formed by multiple opposing jet outlets

understanding vortex

structures is crucial in controlling the spread of viruses and pollutants. In this study

a scaled model of an occupied enclosed space with opposing jet flows was constructed by incorporating a heated floor as a heat source to create thermal plumes under cooling conditions. A particle image velocimetry (PIV) system was employed to measure the flow field under isothermal and cooling conditions. The identification performance of different vortex identification algorithms was compared by studying the turbulent characteristics of the flow field from the perspective of the vortex. The Liutex vortex identification method was applied to analyze the vortex motion within one oscillation period

revealing distinct strengths in counterclockwise and clockwise directions

with maximum intensities of 50 s

-1

and 110 s

-1

respectively. The study concluded that the motion

merging

and annihilation of vortices influenced the flow field structure with a jet oscillation period of approximately 3.67 s. Owing to the trapping effect of vortices on pollutants

areas of pollutant accumulation can be represented using relative frenquency distribution maps of vortex cores. Despite the unsteady flow field

the vortex distribution remained relatively stable. Specifically

on the left side of the CS4 cross-section

the vortex core appeared at the same point up to 21 times. Under cooling conditions

pollutants are confined to smaller regions

which aids in containing the spread of pollutants.

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