主管：中华人民共和国应急管理部
主办：应急管理部天津消防研究所
ISSN 1009-0029  CN 12-1311/TU
消防科学与技术

消防科学与技术 ›› 2023, Vol. 42 ›› Issue (6): 812-817.

• • 上一篇    下一篇

全氟己酮灭火剂雾化性能的数值模拟研究

王之媛, 黄江, 贺元骅   

  1. （中国民用航空飞行学院 民机火灾科学与安全工程四川省重点实验室，四川 德阳 618307）
  • 出版日期:2023-06-15 发布日期:2023-06-15
  • 作者简介:作者简介：王之媛（1997- ），女，中国民用航空飞行学院民机火灾科学与安全工程四川省重点实验室硕士，主要从事机载抑灭火理论与方法研究，四川省德阳市广汉市南昌路四段46号，618307。
  • 基金资助:
    四川省科技计划项目（2021YFSY0001）；四川省重点实验室自主项目（MZ2022JB02）

Numerical simulation of atomization performance of perfluorohexanone fire extinguishing agent

Wang Zhiyuan, Huang Jiang, He Yuanhua   

  1. (Civil Aircraft Fire Science and Safety Engineering Key Laboratory of Sichuan Province, Civil Aviation Flight University of China, Sichuan Deyang 618307, China)
  • Online:2023-06-15 Published:2023-06-15

摘要： 为分析不同环境温度下全氟己酮灭火剂雾化性能，利用VOF-DPM耦合数值模拟方法，研究了4种环境温度下全氟己酮喷雾的雾化锥角、液膜破碎过程与粒径分布特性。结果表明,随着环境温度升高，全氟己酮在喷嘴出口处切向速度增加且离心力增大，雾化锥角逐渐增大；当温度由5 ℃升至35 ℃时，空气黏度增大11.76%、全氟己酮表面张力减弱23.08%，气液两相作用力加剧，全氟己酮液膜在喷射空间一次破碎贯穿距离缩短20%；全氟己酮液膜一次破碎产生的液滴粒径更小，导致液滴索特平均直径显著减小。随着喷雾进程的发展，全氟己酮大粒径液滴进一步破碎为大量小液滴，空间内喷雾液滴尺寸分布更加均匀。

关键词: 环境温度, 全氟己酮, VOF-DPM, 雾化锥角, 破碎过程, 粒径分布

Abstract: In order to analyze the atomization performance of perfluorohexanone fire extinguishing agent at different ambient temperatures, the atomization cone angle, liquid film crushing process and particle size distribution characteristics of perfluorohexanone spray at four ambient temperatures (5, 15, 25, 35 ℃) were studied by using the coupled numerical simulation method of VOF and DPM. The results show that with the increase of ambient temperature, the tangential velocity and centrifugal force of perfluorohexanone at the nozzle outlet increase, and the atomizing cone angle increases gradually. When the temperature increased from 5 ℃ to 35 ℃, the air viscosity increased by 11.76%, the surface tension of perfluorohexanone decreased by 23.08%, the gas-liquid force intensified, and the penetrating distance of perfluorohexanone liquid film in the spray space was shortened by 20%. The droplet particle size was smaller when perfluorohexanone liquid film was broken at one time, which resulted in a significant decrease in the Sott mean diameter of droplet. With the development of spraying process, large size droplets of perfluorohexanone (240~320 μm) were further broken into a large number of small droplets, and the size distribution of the spray droplets became more uniform in space.

Key words: ambient temperature, perfluorohexanone, VOF-DPM, spray cone angle, breaking process, particle size distribution