中国安全科学学报 ›› 2020, Vol. 30 ›› Issue (7): 120-126.doi: 10.16265/j.cnki.issn1003-3033.2020.07.018

• 安全工程技术 • 上一篇    下一篇

基于PIV的气动式细水雾流场研究

柳承徽, 陈先锋** 教授, 张威, 徐乐先, 赵齐, 黄楚原   

  1. 武汉理工大学 安全科学与应急管理学院, 武汉 430070
  • 收稿日期:2020-04-14 修回日期:2020-06-07 出版日期:2020-07-28 发布日期:2021-07-15
  • 通讯作者: ** 陈先锋(1975—),男,湖北应城人,博士,教授,主要从事工业防火防爆方面的研究。E-mail: cxf618@whut.edu.cn。
  • 作者简介:柳承徽 (1996—),男,湖北武汉人,硕士研究生,研究方向为工业安全与消防。E-mail:liu280762@whut.edu.cn。
  • 基金资助:
    国家重点研发计划项目(2018YFC0808500);国家自然科学基金资助(51774221)。

Research on pneumatic water mist flow field based on PIV

LIU Chenghui, CHEN Xianfeng, ZHANG Wei, XU Lexian, ZHAO Qi, HUANG Chuyuan   

  1. School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan Hubei 430070, China
  • Received:2020-04-14 Revised:2020-06-07 Online:2020-07-28 Published:2021-07-15

摘要: 为探究不同气压下气动式细水雾流场的形态变化,分别使用质量流量控制器和粒子图像测速(PIV)技术,测定气动式双流体细水雾喷嘴气液质量流量比(GLR),分析气体驱动压力0.1~0.3 MPa范围内的水雾流场特性。结果表明:在0.1~0.4 MPa的氮气压力下,气动式双流体细水雾喷嘴的无量纲GLR值与氮气压力呈现线性增长关系;GLR会影响喷嘴内部两相流的特性、液体破裂的机制、液滴动力学以及最终的液滴尺寸分布;当气体压力从0.1 MPa增长到0.3 MPa时,平均雾化锥角从55.02°收缩至27°,水雾粒子的主要速率区间从0~5 m/s增长至0~12 m/s;涡旋处的平均涡量从166.502 81 s-1增长至671.191 26 s-1,且水雾粒子气团的涡旋结构均呈现逆时针转动现象。

关键词: 粒子图像测速(PIV), 气动式细水雾, 流场, 气液质量流量比(GLR), 雾化锥角, 涡量

Abstract: In order to explore morphological changes of pneumatic water mist flow field under different gas pressures, GLR of pneumatic two-fluid water mist nozzles were measured by using mass flow controllers and PIV technology. Then, features of flow field were analyzed under gas driving pressure between 0.1-0.3 MPa. The results show that under nitrogen pressure of 0.1-0.4 MPa, dimensionless GLR value of water mist nozzles presents a linear growth relationship with nitrogen pressure, and GLR exerts impacts on characteristics of two-phase flow inside the nozzle, liquid breakdown mechanism, droplet dynamics and final droplet size distribution. When gas pressure increases from 0.1 MPa to 0.3 MPa, average atomization cone angle shrinks from 55.02° to 27°, and main velocity range of water mist particles rises from 0-5 m/s to 0-12 m/s. Average vorticity at vortex increases from 166.502 81 s-1 to 671.191 26 s-1, and vortex structure of particle air mass shows counterclockwise rotation.

Key words: particle image velocimetry (PIV), pneumatic water mist, flow field, gas-liquid mass flow ratio (GLR), atomization cone angle, vorticity

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