摘要
针对难以迅速扑灭的隧道甲醇火灾场景,在截面积9.14m2,长38m的全尺寸隧道内开展了一系列实验,研究了不同通风条件下多喷头细水雾系统对隧道甲醇火灾的抑制作用。通过分析火源周围温度分布、火源下风向隧道温度分布及隧道能见度等参数,综合评估了通风条件下细水雾系统抑制隧道火灾的效果。结果表明:纵向通风降低隧道温度的同时易引起人眼高度处温度升高;细水雾能迅速控制火灾发展并有效降低隧道温度,但细水雾雾滴的扩散与沉降易造成隧道能见度的下降。在本文条件下,风速为4.98m/s的纵向通风和10MPa压力下的6喷头细水雾系统共同作用能够有效降低火源周围温度和隧道温度,并显著提高隧道能见度。
A series of experiments were carried out in a full-scale tunnel (with a cross-sectional area of 9.14 m 2 and length of 32 m) to study the suppression effects of water mist system. In experiments, a water mist system with multiple nozzles was used on tunnel methanol fire with ventilation, for which the temperature profile of the fire source area, the tunnel temperature profile and the visibility of the tunnel at the downwind of fire were analyzed. The results show that the longitudinal ventilation could effectively reduce the tunnel temperature, but it is easy to cause the temperature rising at eye level. Water mist could quickly control the fire and effectively reduce the tunnel temperature, but the tunnel visibility would decrease due to the diffusion and subsidence of water mist. Combined use of longitudinal ventilation and water mist could effectively reduce the temperature around the fire source and the tunnel temperature, and markedly improve the tunnel visibility.
作者
田向亮
钟茂华
刘畅
史聪灵
TIAN Xiangliang;ZHONG Maohua;LIU Chang;SHI Congling(Institute of Public Safety Research, Department of Engineering Physics, Tsinghua University, Beijing 100084, China;College of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China;Institute of Transportation Safety, China Academy of Safety Science & Technology, Beijing 100012, China)
出处
《火灾科学》
CAS
CSCD
北大核心
2019年第1期35-41,共7页
Fire Safety Science
基金
国家重点研发计划项目(2016YFC0802500)
国家自然科学基金项目(51425404,51674152,51774067)
关键词
隧道火灾
细水雾
纵向通风
自然通风
隧道温度分布
能见度
Tunnel fire
Water mist
Longitudinal ventilation
Natural ventilation
Tunnel temperature profile
Visibility
