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.

中文翻译：

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不同弯曲管对密闭空间中甲烷-空气预混合爆炸传播特性的影响

为了探讨不同弯管对预混甲烷-空气爆炸传播特性的影响，建立了实验爆炸管系统和数值模型。通过对实验和数值模拟的对比分析，研究了不同弯度的管道中瓦斯爆炸冲击波的超压演化规律，得到了冲击波超压衰减系数的表达式。结果表明，管道方向的变化加速了瓦斯爆炸冲击波的衰减。弯曲管中气体爆炸的传播衰减主要受弯曲角度和弯曲前初始峰值过压的影响。随着弯曲角度的增加，瓦斯爆炸冲击波的衰减系数逐渐增大。在相同的弯曲角度下，瓦斯爆炸冲击波的衰减系数随瓦斯量的增加而增加。所获得的衰减系数，弯曲角度和弯曲前的初始峰值过压之间的耦合关系对于估计弯曲后的过压值很有用。本文提出的结果对于评估瓦斯勘探事故在巷道中受损的结构具有重要意义，进一步丰富了瓦斯勘探扩散理论。