城市地下车道纵向通风条件下火灾蔓延规律研究  

Study on fire spreading rule in longitudinal ventilation road below street level

作　　者：刘海燕[1] 于年灏[2] 徐志胜[2] 

机构地区：[1]湖南省消防总队,湖南长沙410205 [2]中南大学土木建筑学院防灾科学与安全技术研究所,湖南长沙410075

出　　处：《消防科学与技术》2011年第7期577-579,共3页Fire Science and Technology

摘　　要：以城市地下车道为例,利用FDS进行火灾数值模拟,研究火源功率为15 MW和30 MW,纵向通风速率分别为1、2、3、4 m/s的情况下,地下车道内火源附近、顶棚和车道上方2 m高度处温度场的纵向分布规律以及各工况下的烟气蔓延状况。结果表明:随着纵向通风速率的增大,地下车道内温度逐渐降低,烟气影响范围逐渐减小;随着火源功率的增大,地下车道内温度逐渐升高,烟气影响范围逐渐增大。宜按最不利火灾荷载设计地下车道纵向通风风速。With the road below street level as the example,FDS was used to simulate the fires.In the simulations,the longitudinal distribution rules of the smoke temperature nearby the fire,road ceiling and 2 m above the road,the smoke spreading rule were studied in the situation of different longitudinal ventilation velocities,as 1,2,3 and 4 m/s,with a 15 MW power fire and a 30 MW power fire.The results showed that,with the increase of the road longitudinal ventilation velocity,the temperature and the length of the backflow upstream the fire will gradually decrease;with the increase of the heat release rate,the temperature and the length of the backflow upstream the fire will gradually increase.

关 键 词：城市地下车道 数值模拟 纵向通风 温度分布 烟气蔓延 

分 类 号：X913.4[环境科学与工程—安全科学] TK121[动力工程及工程热物理—工程热物理]