摘要
基于大空间建筑消防泵扬程有限等因素的原因,研究考虑水喷淋流量变化对火灾数值模拟影响的必要性。通过FDS对某小区地下停车场的一个防火分区进行火灾数值模拟,对比各喷头流量保持不变以及前20只喷头开启时流量不变,此后各喷头平均流量逐渐下降两种情况下,喷头响应数量、温度分布、烟气单位长度消光率、烟气层高度等的变化。研究表明:分析大空间火灾水平蔓延或排烟有效性时可不必考虑水喷淋流量变化;在以烟气层温度为重要分析对象时,考虑水喷淋流量变化可使模拟结果更具参考价值。
Based on the factors such as the limited lift of large space building fire pump, this paper studied the necessity of coupling water spray flow variation in fire numerical simulation of large space fire. By fire simulating of a fire compartment in a residential underground parking lot with FDS, and comparing the changes of water spray response quantity, temperature distribution, smoke concentration and smoke layer height under two conditions of water flow staying the same and decreasing after 20 nozzles has responded.The study shows: analyzing the fire horizontal spreading or smoke ventilation efficiency in large space can ignore the change of water flow;when the smoke temperature is focused on, considering the water flow change can improve the reference value of the simulation.
作者
李贤斌
濮凡
高郭平
张少刚
焦宇
LI Xian-bin;PU Fan;GAO Guo-ping;ZHANG Shao-gang;JIAO Yu(School of Ocean Science and Engineering,Shanghai Maritime University,Shanghai 201306,China)
出处
《消防科学与技术》
CAS
北大核心
2019年第10期1428-1431,共4页
Fire Science and Technology
基金
中国科学技术大学火灾科学国家重点实验室开放课题(HZ2018-KF04)
关键词
大空间建筑火灾
数值模拟
水喷淋
流量温度分布
烟气消光率
large space building fire
numerical simulation
water spray
spray flow
temperature distribution
smoke concentration
