Abstract Gas explosion is one of the fatal accidents in underground coal mine, threatening the lives of miners and causing significant economic losses. Gas explosion characteristics are affected by many factors, including flexible obstacles such as flexible duct systems (DS) and line brattices (LB) in the auxiliary ventilation system. In order to explore the influence of flexible obstacles in the tunnel on the propagation law of gas explosion, this study established a numerical simulation model by using OpenFOAM that is an open-source CFD source code. The process variable in XiFoam tools was used for deflagration reaction. Gas explosion simulations were carried out for analyzing the impacts of DS and LB on the evolution of flame and shock wave propagation inside the tube. The results showed that the effect of flexible obstacles on the flame propagation law was evident. The flame shape easily caused many wrinkles in the tube with flexible obstacles. Meanwhile, the maximum pressure and flame propagation speed changed obviously comparing with the empty tube. In the model of DS and LB, the maximum pressure increased by 29 % and 77.8 % than the maximum pressure of empty tube, and the maximum flame propagation speed increased by 6.8 % and 20 % than the flame propagation of empty tube, respectively. The results can provide guidance for gas explosion prevention in underground coal mine.

中文翻译：

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柔性障碍物对煤矿井下瓦斯爆炸特性的影响

摘要 瓦斯爆炸是煤矿井下致命事故之一，威胁着矿工的生命安全，造成重大经济损失。瓦斯爆炸特性受多种因素影响，包括辅助通风系统中的柔性管道系统（DS）和线格（LB）等柔性障碍物。为了探究隧道内柔性障碍物对瓦斯爆炸传播规律的影响，本研究利用开源CFD源代码OpenFOAM建立数值模拟模型。XiFoam 工具中的过程变量用于爆燃反应。进行了气体爆炸模拟，以分析 DS 和 LB 对管内火焰演化和冲击波传播的影响。结果表明，柔性障碍物对火焰传播规律的影响是明显的。火焰形状容易在具有柔性障碍物的管中产生许多皱纹。同时，与空管相比，最大压力和火焰传播速度变化明显。DS和LB模型中，最大压力比空管最大压力提高29%和77.8%，火焰传播最大速度比空管火焰传播速度分别提高6.8%和20%。研究结果可为煤矿井下瓦斯爆炸防治提供指导。最大压力比空管最大压力提高了29%和77.8%，最大火焰传播速度比空管火焰传播速度分别提高了6.8%和20%。研究结果可为煤矿井下瓦斯防爆提供指导。最大压力比空管最大压力提高了29%和77.8%，最大火焰传播速度比空管火焰传播速度分别提高了6.8%和20%。研究结果可为煤矿井下瓦斯爆炸防治提供指导。