火源对木结构古建筑轰燃的影响研究  

Study on effect of ignition sources on flashover of ancient timber structure

作　　者：李兆男 苏华[1] 向天宇[1] 

机构地区：[1]西华大学土木建筑与环境学院,四川成都610039

出　　处：《消防科学与技术》2017年第5期594-595,599,共3页Fire Science and Technology

基　　金：西华大学研究生创新基金项目(YCJJ2016081);四川省教育厅项目(16206450)

摘　　要：运用FDS对某木结构古建筑建模,设定3个火源位置模拟火灾发展过程,得出热释放速率随时间的变化,研究火源位置、火源功率对木结构古建筑的轰燃的影响,得出轰燃发生时间的拟合方程。结果表明:火源位置不同导致起火范围不同,最终影响轰燃时间和最大热释放速率;轰燃时间与火源功率呈递减幂函数关系,最大热释放速率不受火源功率的影响。The model of ancient timber structure was established by FDS to explore the effect of ignition sources on flashover of an- cient timber structure with 3 ignition locations. The change of heat release rate with time was obtained and the influence of ignition lo- cation and heat release rate on flashover was researched. The fit- ting equation of time of flashover was obtained. Results showed that ignition location leads to different fire range and affects the flashover time and maximum heat release rate. Flashover time is a monotonic decreasing power function of the heat release rate and the maximum heat release rate is not affected by the heat release rate.

关 键 词：火源位置 热释放速率 轰燃 木结构 古建筑 FDS 

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]