掘进巷道瓦斯爆炸后巷道内空气温度时空分布

Spatial and temporal distribution of temperature of drivage roadway air after methane explosions

为了得出煤矿井下独头掘进巷道发生瓦斯爆炸后形成的空气热环境,对爆炸后巷道内部空气温度的时空分布规律进行了研究。基于气体方程、爆炸波的动力学和功能原理建立了爆炸产生的超压和温度之间的关系式,通过对超压模型的建立和求解,以及结合爆炸实验数据,得出了较为可靠的爆炸后瞬间巷道内空气温度随传播距离的分布规律。基于瓦斯爆炸发生后伴随有非定常、质量和热量传递等物理现象,建立质量、动量、能量控制方程组,将所求得的爆炸后瞬间巷道内空气温度作为一种初始条件,应用RNGk-ε数学模型进行求解。得到了不同体积浓度瓦斯爆炸后巷道内部空气温度的时空分布规律。研究瓦斯爆炸后巷道内部空气温度时空变化规律对于明确瓦斯爆炸诱发次生火灾或次生爆炸的机理具有重要意义,可为制定相关的灾防措施提供帮助。

The spatial and temporal distribution of air temperature after methane explosions in drivage roadway is studied based on the relationship between overpressure and temperature which is found based on gas equation,dynamic and functional principles.The moment temperature distribution after methane explosions under different concentrations of methane is got through solution to the overpressure model and connection with experimental data.Based on unsteady mass and heat transfer,and other physical phenomena,the controlling equations of mass,momentum and energy are founded.The instantaneous temperature distribution after methane explosions is used as one kind of initial conditions of RNG k-ε model to solve the spatial and temporal distribution of temperature in drivage roadway.Studying on it has great meaning to understand the mechanism of sub-fire or sub-explosions induced by initial explosions.It could provide some understanding and helpful methods to prevent and control those sub-disasters.