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The free radical mechanism of electromagnetic field affecting explosion of premixed methane
Combustion and Flame ( IF 4.4 ) Pub Date : 2021-08-18 , DOI: 10.1016/j.combustflame.2021.111649
Jiancun Gao 1, 2 , Le Wang 1 , Shoutao Hu 1, 2 , Shangyong Zhou 3 , Xigang Yang 1 , Xu Sun 2 , Zijin Hong 1 , Bowen You 1
Affiliation  

To study the mechanism of the electromagnetic field influences flammable gas explosions, 9.5% methane-air explosion tests were carried out in a closed transparent pipe and the effect of the electromagnetic field on the free radicals was analyzed through COMSOL Multi-physics. The relationship between explosion pressure, explosion product composition and its concentration and movement of key free radicals was analyzed from the results of experiment and numerical simulation. In the experiment, the reactions between the reactants and the free radicals were intensified such that the mean overpressure increases by 49.76%, the time of forming in similar flame shape was advanced by 15 ms, 39 ms and 99 ms respectively at the same location and the explosion reaction proceeded violently, and residual methane decreased by 24.57% and carbon monoxide increased by 55.67% in the product components and the generation of other hydrocarbons also decrease. From simulation, the electromagnetic field accelerated the movement of paramagnetic free radicals, which increased the effective collisions of the reaction, and promoted the chain reaction velocity. Accordingly, in places where there is a danger of flammable gas explosions, electromagnetic fields should be avoided.



中文翻译:

电磁场影响预混甲烷爆炸的自由基机理

为了研究电磁场影响可燃气体爆炸的机理,在封闭的透明管道中进行了 9.5% 的甲烷-空气爆炸试验,并通过 COMSOL Multi-physics 分析了电磁场对自由基的影响。从实验和数值模拟结果分析了爆炸压力、爆炸产物组成与其浓度和关键自由基运动之间的关系。实验中,反应物与自由基之间的反应加剧,平均超压增加了49.76%,在同一位置形成相似火焰形状的时间分别提前了15 ms、39 ms和99 ms,爆炸反应剧烈,残留甲烷减少了24。产品组分中的57%和一氧化碳增加了55.67%,其他碳氢化合物的生成也减少了。从模拟来看,电磁场加速了顺磁性自由基的运动,增加了反应的有效碰撞,促进了链式反应速度。因此,在有易燃气体爆炸危险的地方,应避免电磁场。

更新日期:2021-08-19
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