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 ›› 2022, Vol. 41 ›› Issue (10): 1440-1444.

• • 上一篇    下一篇

密闭腔室内高压七氟丙烷喷放与局部过冷研究

袁焱华1，2，卢启钊2，谢启源2   

  1. （1.应急管理部上海消防研究所，上海 200032；2.中国科学技术大学 火灾科学国家重点实验室，安徽 合肥 230027）
  • 出版日期:2022-10-15 发布日期:2022-10-15
  • 通讯作者: 应急管理部上海消防研究所科技计划项目（20SX28）
  • 作者简介:作者简介：袁焱华（1983- ），男，应急管理部上海消防研究所上海倍安实业有限公司高级工程师，硕士，工程博士在读，国家一级注册消防工程师，主要从事消防专业工程防火设计施工和消防安全评估工作，上海市中山南二路601号，200032。

Study of injection characteristics of high-pressure fluoropropane and local damage by sudden cooling in enclosed room

Yuan Yanhua1,2， Lu Qizhao2， Xie Qiyuan2   

  1. (1. Shanghai Fire Science and Technology Research Institute of MEM, Shanghai 200032, China; 2. State Key Lab of Fire Science, University of Science and Technology of China, Anhui Hefei 230027, China)
  • Online:2022-10-15 Published:2022-10-15

摘要： 摘 要：针对高压七氟丙烷气体喷放行为，建立了密闭腔室高压气体小孔喷射动态发展与演化模型，基于数值分析研究了高压七氟丙烷小孔喷射过程中的组分场、温度场和速度场等特性，并开展了相应喷放试验研究。计算结果表明，七氟丙烷喷射后易形成气体回卷，继而在障碍物靠近喷射口一侧形成七氟丙烷稀薄区域。七氟丙烷发生意外喷射时，尽管在喷口附近产生的最低温度低至-20 ℃，当七氟丙烷喷射口距离电子设备超过1.75 m时，则相应的低温影响往往在可接受范围。

关键词: 关键词：消防, 七氟丙烷, 高压喷射, 低温损伤, 机房, 电子设备, 数值模拟

Abstract: Abstract: The early (smoldering and initial) fire detection experiments of cable interlayer are carried out through the full-scale cable interlayer experimental platform. The temperature field and CO gas propagation characteristics are studied. Based on the combination of experimental research and numerical simulation, the effectiveness of point-type temperature detector, point-type smoke detector, cable-type temperature detector, and suction-type smoke detector with different response time thresholds is analyzed. The results show that: The temperature field attenuation of smoldering and initial fire presents an exponential function. The average velocity of CO gas propagation in smoldering fire is basically the same when the distance from the fire source increases, but decreases with the increase of the distance from the fire source in the initial fire. The alarm time of cable-type temperature detector is 69% earlier than that of suction-type smoke detector, and 82% earlier than that of point-type smoke detector. Compared with smoldering fire, the initial fire response time of each detector is 56% earlier on average. Under the condition of smoldering fire, the point-type temperature detector fails to report. The response time of fire detector with high alarm threshold is 10% ~ 20% later than that of low threshold detector.

Key words: Key words: power plant, cable interlayer, early fire, temperature field, CO volume fraction, fire detection, response time threshold