矿井乏风瓦斯点火延迟时间的数值模拟

摘要

运用Chemkin程序和GRI-Mech3．0机理，对入射激波诱导下矿井乏风瓦斯点火延迟时间进行数值模拟．首先，根据乏风瓦斯燃烧基元反应敏感性分析，定义CH，峰值出现的时刻为乏风瓦斯的点火延迟时间，然后分别研究瓦斯体积分数、入射激波速度、乏风瓦斯初始温度、初始压力对点火延迟时间的影响．研究结果表明，入射激波速度、乏风瓦斯初始温度、初始压力的增加均会使燃烧温度增加，CH3峰值增加，点火延迟时间缩短，其中入射激波速度的增加缩短点火延迟时间的效果最为显著，乏风瓦斯体积分数变化（0．1％-1．0％）对点火延迟时间的影响较小．%he ignition delay time of ventilation air methane in coal mining induced by incident shock was nu- merically studied by Chemkin code and GRI-Mech 3.0 mechanisms. Initially, according to the sensitivity ana- lyzing of elementary reactions, the ignition delay time of ventilation air methane was defined by the topic value of the mole fraction of CH3. Then, main attentions were paid to the effects of the ventilation air methane con- centration, initial temperature and initial pressure, and the incident shock velocity on the ignition delay time. It is found that, with the increment of the incident shock velocity, the initial temperature and initial pressure of ventilation air methane, the temperature and the topic value of the mole fraction of CH3 were increased, and the ignition delay time would be shortened. The incident shock velocity play an important role of shortening the ignition delay time. The ventilation air methane concentration, during 0.1%- 1.0% , however, has no signif- icant effect on the ignition delay time.