水喷淋作用下小室火灾特性  

Characteristics in Cabin Fire Under Sprinkler

作　　者：游宇航[1] 李元洲[1] 霍然[1] 胡隆华[1] 王浩波[1] 李思成[1] 孙晓乾[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

出　　处：《燃烧科学与技术》2008年第2期137-142,共6页Journal of Combustion Science and Technology

基　　金：国家自然科学基金(50536030)

摘　　要：采用全尺寸实验对水喷淋作用下的小室火灾特性展开研究,揭示了小室内烟气的平均温升、O_2体积分数、CO体积分数的变化规律以及溢出烟气在大空间内的充填规律.结果表明,低于临界喷淋压力,水喷淋的作用主要是控火,高于此压力,水喷淋的作用主要是灭火;水喷淋可以有效降低小室内的温度,但是也会产生大量的烟水混合气;CO体积分数在水喷淋作用后会急剧增加,控火时存在两个峰值,灭火时只有一个峰值;喷淋压力低于临界压力,CO生成量随着压力的增加而增加,喷淋压力高于临界压力,CO生成量随着压力的增加而减少,在临界压力时CO生成量达到最大;从小室溢出的烟气能在300 s左右从27m下降到3m的高度,烟气生成量与CO生成量的变化趋势一致.Full-scale burning tests were carried out to study the characteristics of cabin fire under sprinkler. Smoke average temperature difference, O2 concentration and CO concentration in the cabin and smoke spilling out from the cabin filling large space were obtained. Results showed that one fire suppressing effect under sprinkler was controlling fire if sprinkler pressure was lower than the critical pressure, and another one was extinguishing fire if sprinkler pressure was higher than the critical pressure. Temperature in the cabin could be obviously reduced under sprinkler, but meanwhile, much smoke mixed with vapor was produced. CO concentration increased sharply after sprinkler. There were two peaks at controlling fire, and only one peak at extinguishing fire. When sprinkler pressure was lower than the critical pressure, the CO produced increased with the increase of sprinlder pressure. When sprinkler pressure was higher than the critical pressure, the CO produced decreased with the increase of sprinkler pressure. The produced CO reached the maximum at the critical pressure. Smoke spilling out from the cabin descended from 27 m to 3 m within 300 s. The CO produced reflected the smoke produced.

关 键 词：水喷淋 小室火灾 控火 灭火 大空间 全尺寸燃烧实验 

分 类 号：TK121[动力工程及工程热物理—工程热物理]