细水雾作用下气体射流火焰熄灭的临界条件  

Critical Condition of Jet Flame Suppression by Water Mist

作　　者：陆嘉[1] 廖光煊[1] 黄咸家[1] 陶常法[1] 

机构地区：[1]中国科学技术大学火灾科学国家重点实验室,合肥230027

出　　处：《燃烧科学与技术》2011年第5期414-418,共5页Journal of Combustion Science and Technology

摘　　要：设计了开放空间条件下细水雾扑灭气体射流火的模拟实验,发现可燃气体流率大小和火焰上升力大小都直接影响了灭火成功与否,进而通过理论分析和计算分别得出了细水雾灭射流火的临界条件,细水雾的吸热功率大于11%～15%射流火的火源功率时可实现灭火,射流上升力与细水雾下压力的比值小于1.0～2.8时细水雾也能够通过克服火焰上升力进而实现灭火,实验结果也显示,相同气体流率情况下气体射流上升力与细水雾下压力的比值越大则灭火时间越长.A simulated experiment has been designed to study the extinguishment of methane jet flame by water mist in open space. It is found that gas flow rate and fire rising force have direct influence on the result of fire-fighting. Calculation results show that jet flame can by extinguished on condition that the endothermic power of water mist is 11% to 15% larger than fire source power, or on condition that the ratio of jet rising force to doun thrust of water mist is less than 1.0 to 2.8. Experimental result also shows that the bigger the ratio of jet rising force to down thrust of water mist, the longer extinguishing time at the same gas flow rate.

关 键 词：细水雾 射流火 临界条件 

分 类 号：X93[环境科学与工程—安全科学]