Effect of ignition position on overpressure in vented explosion of methane-air mixtures

被引：0
|
作者：
Wang C. [1 ]
Yang S. [1 ]
Fang Q. [1 ]
Bao Q. [2 ]
机构：
[1] State Key Laboratory of Disaster Prevention and Mitigation of Explosion and Impact, Army Engineering University of PLA, Nanjing, 210007, Jiangsu
[2] Unit 91058 of PLA, Sanya, 572000, Hainan
来源：
Yang, Shigang (youngshg@126.com) | 2018年 / Explosion and Shock Waves卷 / 38期
关键词：
Ignition position; Methane-air mixtures; Peak overpressure; Vent explosion;
D O I：
10.11883/bzycj-2016-0344
中图分类号：
学科分类号：
摘要：
Vented explosion tests were carried out in a 12 m3 concrete chamber filled with premixed methane-air mixture with the methane volume fraction of 9.5%, and the influence of the ignition position on the development of overpressure and the evolution of flame was investigated. The results show that this influence on the rising rate of Δp1 was nearly negligible but the peak value of Δp2 increased with the increase of the distance between the ignition position and the vent, and the peak value of Δp4 was correlated with different ignition positions, i. e. central ignition, rear ignition, front ignition, in an order of descending influence. Moreover, when the venting pressure got bigger, Δp1 had the same increment at all the ignition positions, whereas Δp2 vanished in front and central ignitions, and Δp4 increased with the increase of venting pressure only in center ignition. Besides, the evolution of the external frame was observed to fall into two stages: the fireball formation and the jet frame. The size of the fireball and the maximum length of the external jet flame in rear and central ignitions were larger than those in front ignition. © 2018, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.
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页码：898 / 904
页数：6
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