摘要
大型仓库等场所由于存在明显的障碍物空间遮挡情形,一旦发生火灾,障碍物势必会对细水雾灭火效果及其作用机制产生影响.通过搭建1/6缩尺度实验平台,利用平面激光诱导荧光(PLIF)及粒子图像测速(PIV)技术,获取了细水雾与障碍物遮挡火焰相互作用的火焰羟基自由基浓度分布及细水雾流场数据.结果表明,细水雾可以有效熄灭最大有效雾量比大于0.59且火焰功率小于3.93 kW的遮挡火焰.PIV拍摄视场下雾滴最大速度随细水雾施加时间的特征规律,揭示了灭火过程中雾-焰相互竞争的动力学机制.
Under large warehouses fires,obstacles will inevitably have an impact on the effectiveness and mechanism of water mist fire extinguishing due to obvious obstruction of space.By building a 1/6-scale experimental platform,the flame hydroxyl radical concentration distribution and the water mist flow field data of the interaction between the water mist spray and the shielded flame were obtained using planar laser-induced fluores-cence(PLIF)and particle image velocimetry(PIV)techniques.The results show that the water mist can effectively extinguish the shielded flames with a maximum effective mist ratio greater than 0.59 and a fire heat release rate smaller than 3.93 kW.The characteristic pattern of the maximum velocity of droplets changing with the water mist discharging time in the field of view photographed by PIV reveals the kinetic mechanism of mist-flame competition during fire extinguishing.
作者
刘洋鹏
王喜世
沈佳杏
李国春
倪小敏
潘传鱼
Liu Yangpeng;Wang Xishi;Shen Jiaxing;Li Guochun;Ni Xiaomin;Pan Chuanyu(State Key Laboratory of Fire Science,University of Science and Technology of China,Hefei 230026,China;State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China;Huzhou Institute of Zhejiang University,Huzhou 313000,China)
出处
《燃烧科学与技术》
CAS
CSCD
北大核心
2022年第5期489-497,共9页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(51874265)
安徽省高校协同创新计划资助项目(GXXT-2020-079).
