巷道火灾烟流滚退距离的理论研究

Theoretical study on the backflow distance of smoke and hot gasesin a roadway fire

从因次分析的角度出发,获得反映巷道火灾时期烟流滚退距离变化规律的通用无因次表达式,该表达式包含火源热释放速率、巷道风速、巷道倾角等参数与无因次滚退距离之间的函数关系.分析了该表达式中各个参数与无因次滚退距离之间单调性,结果表明En与l呈单调递增关系,Fu与l和θ呈单调递减关系.研究结果为巷道火灾烟流滚退的模拟实验奠定了基础.图2,表1,参9.

A dimensionless expression, which showed the general changing law of the backflow distance of smoke and hot gases due to a roadway fire, was obtained by means of dimensional analysis. The expression includes parameters such as the non-dimensional distance, fire heat release rate, ventilation rate, and the tunnel inclination angle, etc. The function monotonicity between these parameters and l was analyzed. The result of the analysis indicates that l increases with the increase of En and decreases with the increase of Fu and θ The research results here can serve as a guide for conducting experiments to simulate the back flow of smoke and hot gases. 2fig. ,1tab. ,9refs.