半横向通风作用下隧道火灾烟气蔓延特性数值模拟研究

Numerical investigation on smoke propagation characteristics of tunnel fire under semi-transverse ventilation

采用数值模拟方法对半横向排烟下的隧道火灾烟气蔓延特性展开研究,研究排烟口数量、排烟口风速以及排烟口间距对烟气蔓延范围以及顶棚下方温度分布的影响。研究发现:排烟口数量的增加可有效减小烟气蔓延范围并降低烟气温度,但排烟口数量增加到一定值后,烟气蔓延距离基本保持不变;排烟口风速的增大可减小烟气蔓延范围并降低烟气温度,但排烟口风速增大到一定值后,烟气蔓延距离基本保持不变;随着横向排烟口间距的增大,烟气蔓延范围随之增大,顶棚下方烟气温度呈上升趋势。

Numerical simulation is used to study the smoke spread characteristics of tunnel fires with semi-transverse smoke exhaust,and to investigate the effects of the number of smoke vents,smoke exhaust air velocity and smoke exhaust spacing on the smoke spread and temperature distribution under the roof.It is found that the increase in the number of smoke vents can effectively reduce the spread and temperature of smoke,but the smoke spread distance remains basically the same after the number of smoke vents increases to a certain value.The increase of smoke vent air speed can reduce the smoke spread range and temperature,but after the increase of smoke vent air speed to a certain value,the smoke spread distance basically remains the same;with the increase of horizontal smoke vent spacing,the smoke spread range increases,and the smoke temperature under the roof is on the rise.