高温逆气流中细水雾的行为与控制研究  

Study on behavior and control of droplets in high-temperature counter gas

作　　者：何明礼 章光[1] 胡少华[1] 王成 HE Mingli;ZHANG Guang;HU Shaohua;WANG Cheng(School of Safety Science and Emergency Management,Wuhan University of Technology,Wuhan Hubei 430070,China;School of Environmental Science and Engineering,Hubei Polytechnic University,Huangshi Hubei 435000,China)

机构地区：[1]武汉理工大学安全科学与应急管理学院,湖北武汉430070 [2]湖北理工学院环境科学与工程学院,湖北黄石435003

出　　处：《中国安全科学学报》2020年第11期82-87,共6页China Safety Science Journal

摘　　要：为提高细水雾的穿透性能,研究高温逆气流中细水雾的行为,建立单个雾滴运动、传热模型,分析逆气流和高温对雾滴速度和穿透距离的影响,评估协流射流对雾滴的控制效果,提出协流射流细水雾灭火系统的设计方法。结果表明:对于小雾滴而言,增大喷头工作压力难以有效提高雾滴的穿透距离,雾滴易被逆气流夹带;协流射流能够减小雾滴速度衰减,提高雾滴穿透距离;协流作用下雾滴的运动特征有利于减小雾滴在烟气层中的汽化,增大进入火焰区的雾滴数量,从而提高雾滴的利用效率;按照协流射流细水雾灭火系统的设计方法可以初步确定该系统的结构参数和运行参数。In order to promote penetration properties of water mist,its motion in high-temperature counter flow was studied.Firstly,a motion and heat transfer model of a single droplet was established which was utilized to analyze effects of counter gas and high temperature on velocity and penetration distance of droplets in detail.Then,control effects of co-flow jet on droplets were evaluated.Finally,a method to design a co-flow jet water mist fire extinguishing system was proposed.The results show that it is difficult to effectively increase penetration distance of small droplets by increasing operating pressure at sprinklers,and moreover,droplets are easily entrapped by counter gas.A co-flow jet can help reduce velocity attenuation and increase penetration distance.Furthermore,utilization efficiency of water mist can be improved by a co-flow jet due to decrease of droplet vaporization in flue gas layer and increase of droplets entering flame zone.Structure and operation parameters of a co-flow jet water mist fire extinguishing system can be basically determined according to the design method.

关 键 词：高温逆气流 细水雾 协流射流 工作压力 穿透距离 

分 类 号：X932[环境科学与工程—安全科学]