摘 要 据统计，在全国煤矿事故中，瓦斯爆炸是造成重大伤亡事故的最为严重的事故灾害之一，瓦斯爆炸过程中所产生的巨大冲击波和高温火焰，在传播过程中摧毁巷道，毁坏井下设备，威胁人员生命安全，给国家和人民生命财产造成巨大损失。 本文基于瓦斯爆炸理论，采用实验测试、理论分析、数值模拟三种方法，系统地研究了影响瓦斯爆炸传播规律的因素。应用20L瓦斯爆炸实验系统，对瓦斯爆炸极限进行了测试，实验结果表明，当混合气体中的甲烷浓度小于4.7%或大于15%时都不会发生爆炸。在实验与理论分析基础上，建立合适的物理和数学模型，采用流体动力学软件 FLACS 模拟了20L瓦斯爆炸实验系统的爆炸过程，验证了FLACS软件模拟结果的可行性。 结合煤矿井下环境，采用数值模拟手段分析了独头巷道系统对中不同瓦斯浓度、障碍物数量对瓦斯爆炸传播过程的影响。研究表明：障碍物的存在都可以增大未反应气体的湍流度，从而增大火焰锋面面积，加剧反应进行；障碍物数量和位置对火焰的传播过程具有重要影响，障碍物的数量增加可以增大火焰传播速度及压力波的变化幅度，而障碍物的位置靠近点火源时，爆炸火焰锋面的湍流程度较大，传播速度也较快。采用数值模拟手段作为补充，可以较好的反映瓦斯爆炸的传播特征。研究结果对当前煤矿瓦斯爆炸传播过程分析及瓦斯爆炸事故预防和后果分析有一定的指导作用。

ABSTRACT According to statistics, in the national coal mine gas explosion accident, is the fatal accidents caused by the most serious accident of gas explosion, which produced in the process of huge shock wave and high temperature flame, in the communication process to destroy the roadway, destroying the down hole equipment, personnel safety threat, to the country and people life property to cause huge loss. Based on the gas explosion theory, experimental test, theoretical analysis, numerical simulation methods, systematically studied the influence factors of the propagation of gas explosion. Application of 20L gas explosion experiment system for the gas explosion limit, were tested, the experimental results show that, when the mixed gas of methane concentration is less than 4.9% or more than 15% will not explode. In the experimental and theoretical analysis basis, establish the suitable physical and mathematical model of fluid mechanics, using software FLACS to simulate the 20L gas explosion experiment device of explosion process, verify the feasibility of the simulation software of FLACS results. Combined with the environment of coal mine underground, using numerical simulation method to analyze the heading face systems of different gas concentration, obstacle amount on the process of gas explosion propagation effects. Research shows that: the obstacle can increase the unreached gas turbulence, thereby increasing the flame front area, increase reaction; obstacle number and position on the flame propagation process has important implications, number of obstacles increase can increase the flame propagation velocity and pressure wave amplitude changes, and the obstacle location near source of ignition, explosion flame turbulence degree is bigger, faster transmission, with the 20L gas explosion experiment system based on FLACS software feasibility is verified by numerical simulation, as a supplement, can reflect the propagation characteristics of gas explosion. The results of the current coal mine gas explosion propagation analysis and gas explosion accident prevention and effects analysis of a certain guiding function.