Effect of Different Bend Pipes on the Propagation Characteristics of Premixed Methane-Air Explosion in Confined Spaces
Effect of Different Bend Pipes on the Propagation Characteristics of Premixed Methane-Air Explosion in Confined Spaces
复制标题
不同弯管对密闭空间预混甲烷-空气爆炸传播特性的影响
DOI：
10.1155/2021/6635156
复制
发表时间：
2021-02-26
期刊：
影响因子：
1.7
通讯作者：
Ren, Bo
中科院分区：
文献类型：
--
作者：
Qiu, Jinwei;Jiang, Bingyou;Ren, Bo
为研究不同弯曲管道对甲烷-空气预混爆炸传播特性的影响，建立了爆炸管道实验系统和数值模型。采用实验与数值模拟对比分析的方法，研究了瓦斯爆炸冲击波在不同弯管中的超压演化规律，得到了冲击波超压衰减系数的表达式。结果表明，管道方向的改变加速了瓦斯爆炸冲击波的衰减。气体爆炸在弯曲管道中的传播衰减主要受弯曲角度和弯曲前初始峰值超压的影响。随着弯曲角度的增大，瓦斯爆炸冲击波的衰减系数逐渐增大。对于相同的弯曲角度，瓦斯爆炸冲击波的衰减系数随瓦斯体积的增加而增大。得到的衰减系数、弯曲角度和弯曲前初始超压峰值之间的耦合关系可用于估算弯曲后的超压值。本文的研究成果对瓦斯勘探事故矿井巷道中已破坏结构的评价具有重要意义，进一步丰富了瓦斯勘探扩散理论。
To explore the effect of different bend pipes on the propagation characteristics of premixed methane-air explosion, the experimental explosion pipe system and numerical model were established. By adopting the comparative analysis of experiments and numerical modeling, it conducted researches on the overpressure evolution of gas explosion shock wave in pipes with different bends and obtained the expressions of attenuation coefficient of shock wave overpressure. The results showed that the change of pipe direction accelerated the attenuation of gas explosion shock wave. The propagation attenuation of gas explosion in the bend pipe was mainly affected by the bending angle and initial peak overpressure before bending. With the increase of the bending angle, the attenuation coefficient of gas explosion shock wave gradually increased. For the same bending angle, the attenuation coefficient of gas explosion shock wave increased with the increase of gas volume. The obtained coupling relationships between attenuation coefficient, bending angle, and initial peak overpressure before bending were useful for estimating the overpressure value after the bend. The results presented in this paper have important significance for the assessment of structures that have been damaged in the mine laneway of gas exploration accidents, further enriching the gas exploration spread theory.