Effect of external magnetic field on explosion reaction of acetylene gas

被引：0
|
作者：
Gao J. [1 ,2 ]
Yang X. [1 ]
Hu S. [1 ,2 ]
Hong Z. [1 ]
Wang L. [3 ]
Li R. [1 ]
Xia Y. [1 ]
Sun X. [2 ]
机构：
[1] School of Safety Engineering, Beijing Institute of Petrochemical Technology, Bejing
[2] Beijing Academy of Safety Engineering and Technology, Beijing
[3] Bejing Xuyang Chemical Technology Institute Co. Ltd, Beijing
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2022年 / 42卷 / 07期
关键词：
electromagnetic fields; elementary reactions; flame propagation velocity; free radicals; reaction paths;
D O I：
10.11883/bzycj-2021-0417
中图分类号：
学科分类号：
摘要：
To study the effects of magnetic fields on the gas explosion, considering equivalent acetylene premixed combustible gas as the research object, the effects of different magnetic field intensities on acetylene explosion characteristics were studied experimentally. The explosion pressure and flame propagation velocity were measured simultaneously by transient pressure sensors and a detonation velocity instrument, respectively. The results show that the magnetic fields reduce the explosion pressure and the pressure rise rate of acetylene. With increasing magnetic field intensity, the suppression effect is more significant. Along the direction of flame propagation, the magnetic fields first promote and then suppress the explosion flame propagation velocity of acetylene, and the inhibition effect is stronger than the promotion effect. In these experimental conditions, the average propagation velocity of the explosion flame decreased by 38.94% under lower magnetic fields intensity, and at higher magnetic fields intensity, it decreased by 49.62%. To further study the impact mechanism of magnetic fields on premixed combustible gas explosion, the acetylene explosion free radicals reaction process was simulated numerically by Chemkin-Pro software. The chain reactions, rate of products, and sensitivity are analyzed. And the key radical and reaction paths of acetylene explosion are obtained. Combined with the force analysis of magnetic fields on free radicals, it is deduced that magnetic fields change the reaction paths of acetylene to produce carbon dioxide and water, which is the main internal reason for the decrease in explosion parameters. The different free radicals have different molar masses and magnetization. Lorentz force and gradient magnetic field force have stronger effects on small molecular weight free radicals than on large molecular weight free radicals. The calculation shows that the magnetic fields change the trajectory of the free radicals, cause the aggregation of free radicals with the same small molecular weight, and produce a wall effect, which reduces collisions between key free radicals and the rate of elementary reactions, resulting in a decrease of explosion intensity. © 2022 Explosion and Shock Waves. All rights reserved.
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