矿井火灾烟流滚退距离的数值模拟

根据质量、动量、能量和组分守恒原理建立了考察烟流滚退距离的数学模型，并采用计算流体力学方法进行了数值求解，求解结果与试验结果基本一致．以一个大规模火灾为例，考察了不同通风风速和火源热释放速率对烟流滚退距离的影响．结果表明：烟流滚退距离随通风风速的增加而显降低，随火源热释放速率的增强而不断增长且在低热释放速率时增加幅度较大。

Numerical Analysis of Backflow Distance of Smoke in Mine Fire

Mathematical equations for investigation of backflow distance of smoke in a mine fire were set up according to the conservation of mass, momentum, energy and gases components. The method of computational fluid dynamics was then used to solve the equations. The solved data were validated by experimental results. In addition, a calculation for large-scale fire was performed to examine the effects of ventilation velocity and fire heat release rate on the backflow distance of smoke. The result obtained indicates that ventilation rate and heat release rate are two crucial physical parameters influencing the backflow distance. The backflow distance considerably decreases with the increase of ventilation velocity. However, it increases with the increase of heat release rate and even more markedly with lower heat release rate.