受限空间内多孔介质材料对瓦斯爆炸特性的抑制作用

Inhibitory Effect of Porous Media Materials on Characteristics of Gas Explosion in Confined Space

为研究多孔介质材料抑制瓦斯爆炸传播特性,基于瓦斯爆炸链式反应理论,采用47步反应机理,建立了填充有多孔介质材料的二维管道瓦斯爆炸数学模型。利用Fluent软件分别对充满体积浓度为9.5%甲烷-空气的空管道和铺设有多孔介质材料的管道模型进行数值模拟与对比分析,以研究瓦斯爆炸过程中火焰传播速度和爆炸压力波受到多孔介质材料的影响。结果表明:多孔介质材料的复杂孔隙增加了自由基与孔壁的碰撞几率,使能够参与反应的自由基减少,抑制火焰传播;一部分爆炸波被多孔介质材料吸收,且在微小孔洞中经过多次反射和散射,造成能量损失,使爆炸压力波降低。

In order to study the characteristics of porous media material suppressing gas explosion propagation,a two-dimensional mathematical model of pipeline of gas explosion filled with porous media material was presented based on the theory of gas explosion chain reaction and by applying the simplified 47-step reaction mechanism. Numerical simulation and comparative analysis were separately conducted in an empty pipeline and a pipe with porous material by using the Fluent software,and the pipeline was full of volume concentration of 9. 5% methane-air. The impacts of porous materials on flame propagation speed and explosion pressure wave were researched during the process of gas explosion. The results showed that complex pore of porous material increases the probability of collision between radicals and whole wall,leading to reduction of radicals that can participate in the reaction and inhibiting flame spread. Part of the blast wave was absorbed by the porous material,and after several times of reflection and scattering in the tiny holes,the loss of energy was resulted in. The pressure wave of methane explosion was reduced.