火源位置对L型管廊电缆火灾影响规律的数值模拟研究

选取某城市L型综合管廊电缆舱为研究对象,采用FDS数值模拟软件研究了不同火源位置对L型管廊电缆火灾温度纵向衰减规律、烟气浓度分布规律及烟气危害性的影响。研究结果表明,L型廊道构型影响了不同火源位置的管廊电缆火灾最高温度纵向衰减的连续性,基于热边界层理论提出了适用于L型管廊的二维平面最高温度纵向衰减模型。基于峰宽时间计算了L型管廊火灾的烟气总危害性参数,不同火源位置的烟气危害性总在靠近管廊节点位置处最低。这些结果可对综合管廊的消防设计与火灾防控提供参考。

Numerical simulation on the influence of fire source location on cable fire in L-shaped utility tunnel

In this paper, the L-shaped utility tunnel cable cabin in a city is selected as the research object, and the FDS is used to study the influence of different fire source locations on the longitudinal temperature attenuation law of L-shaped utility tunnel cable fire, the distribution law of smoke concentration and the hazard of smoke. The research results show that the L-shaped configuration affects the continuity of the longitudinal attenuation of the maximum temperature of the utility tunnel cable fire at different fire source locations. Based on the thermal boundary layer theory, a longitudinal attenuation model of maximum temperature on a two-dimensional plane suitable for L-shaped utility tunnel is proposed. Based on the peak width time, the total smoke hazard parameters of the L-shaped utility tunnel fire are calculated, and the smoke hazard of different fire source locations is always the lowest near the node of the utility tunnel. These results can provide a reference for the fire protection design and fire prevention and control of the utility tunnel.