中文摘要：

最小点火能是可燃气体危险性辨识的重要参数之一。为从理论上得到混合气体的最小点火能,建立了可燃气体火花点火的物理模型,给出了通过数值模拟得到的可燃气体最小点火能量的预测方法,采用该方法得到了甲烷-空气混合气火花点火的临界温度及最小点火能量。结果表明：甲烷-空气混合气的最小点火能量与浓度呈U型关系,浓度为8.5%的预混气的最小点火能量计算值为0.39mJ,与实验值0.4mJ吻合较好。

英文摘要：

The combustible g the combustib mixtures thro minimum ignition energy is one of the important properties to estimate the fatalness of ases. To get a theoretical value of minimum ignition,a physical model of spark ignition of le gases was established, and a minimum ignition energy prediction method of combustible ugh a numerical analysis was given. The critical temperature and minimum ignition energy of methane-air mixture during spark ignition process were obtained. The results shows that MIE of methane air has a U shaped relationship to concentrations, and the MIE of premixed gas under concentration of 8.5 % is 0.39 mJ,which agrees well with the experimental value.