矿井倾斜巷道的火灾浮力效应烟流阻力分析

Analysis on the Resistance of Smoke Flow due to Buoyancy Effect for Sloping Tunnels

浮力效应烟流阻力是矿井倾斜巷道火灾烟气控制中重要影响因素,其数值与巷道内温度分布密切相关。结合着火巷道内烟气扩散情况,提出浮力效应烟流阻力三区域模型。根据能量守恒原理,依次建立着火巷道火区、下游烟气扩散区烟流沿程温度分布预测模型,进而预测矿井倾斜巷道发生火灾时浮力效应烟流阻力的大小。以某倾斜巷道为例,通过MATLAB计算讨论了火区长度、巷道坡度、火源强度对着火巷道烟气沿程温度分布、浮力效应烟流阻力组成及其大小的影响。

The resistance of smoke flow due to buoyancy effect plays a prominent role in the event of sloping tunnel fire. And the difficult part for the calculation of effective pressure difference due to the buoyancy effect is the estimation of temperature distribution in the tunnel. On the basis of the diffusion of smoke in the fire tunnel, the three regional model of the resistance to the smoke flow is presented according to the smoke propagation. Then the energy equation is solved for each zone. And a routine that calculates the temperature distribution along the length of the tunnel is included as well as the computation of the resistance of smoke flow due to buoyancy effect. In addition, the application of the resistance of smoke flow due to buoyancy effect of some sloping tunnels illustrates its composition and influencing factors such as fire intensities, tunnel slope and fire lengths by the software of MATLAB.