摘要
为了探讨不同粒径细水雾对管内瓦斯爆炸特性的影响机理,采用试验和数值模拟相结合的方法进行分析。结果表明,5μm粒径的细水雾对瓦斯爆炸具有很好的抑制作用,能够有效降低爆炸时的火焰温度、火焰传播速度和最大超压值,但45μm和160μm粒径的细水雾对管道内瓦斯爆炸却起到一定的促进作用。其原因是:小粒径细水雾在火焰锋面能够完全蒸发,蒸发时产生的吸热阻氧效应使燃烧反应速率降低,从而起到抑制瓦斯爆炸的作用;大粒径水雾在火焰锋面无法完全汽化,在流场中引起湍流增强效应,使爆炸强度增强。研究结果对细水雾抑爆系统的设计具有理论指导作用。
In order to study the influence mechanism of fine water mist with different particle sizes on the gas explosion characteristics in the pipe,the experiments combined with numerical calculations were conducted to analyze.The results showed that the 5μm fine water mist has a good inhibitory effect on gas explosion,which could effectively reduce the flame temperature,flame propagation velocity and maximum overpressure value during explosion,but the 45μm and 160μm fine water mist can play a certain role in promoting the gas explosion in the pipeline.The reason is that the small particle size fine water mist can completely evaporate in the surface of the flame,and the heat absorption and oxygen barrier effect produced by the evaporation of the mist droplets reduced the combustion reaction rate,thereby the gas explosion was suppressed.The large particle size mist droplets couldnot be completely vaporized in the surface of the flame,and caused turbulence enhancement effect in the flow field,this made the explosion intensity increase.The results had a good theoretical guidance for the design of fine water mist explosion suppression system.
作者
常新明
张红军
魏垂胜
刘永志
王发辉
CHANG Xinming;ZHANG Hongjun;WEI Chuisheng;LIU Yongzhi;WANG Fahui(Henan Longyu Energy Co.,Ltd.,Yongcheng476600,Henan,China;School of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo454000,Henan,China)
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2021年第5期8-15,共8页
Journal of Henan Polytechnic University（Natural Science）
基金
国家自然科学基金资助项目(51774115)。
关键词
瓦斯爆炸
细水雾粒径
抑爆
影响机理
gas explosion
fine water mist particle size
explosion suppression
influence mechanism
作者简介
第一作者:常新明(1986-),男,山东聊城人,工程师,主要从事矿井机电安全技术方面的研究工作。Email:452258734@qq.com;通讯作者:王发辉(1978-),男,河南平顶山人,博士,副教授,主要从事非常规能源安全高效利用技术方面的教学和研究工作。Email:fahui@hpu.edu.cn。
