单侧集中排烟隧道烟气控制数值研究

Numerical Study on the Smoke Control of Single-side Centralized Smoke Exhaust Tunnel

为了探明单侧集中排烟隧道内火灾特性参数的变化情况,通过数值模拟研究了排烟口开启数量对单侧集中排烟隧道内烟气控制、温度分布及排烟效率的影响。结果表明:对于单侧集中排烟隧道来说,开启火源附近4个排烟口时烟气控制效果最好,烟气单侧蔓延长度在105 m以内;所有工况下,人眼高度处温度均在60℃以下,排烟口数量大于2个时,排烟风量对隧道内温度分布影响不大;不同排烟口数量下总排烟效率随着排烟风量的增大而增加,不同工况下总排烟效率在85%以上,4个排烟口时的排烟效率均高于其他排烟口数量的排烟效率;火源热释放速率为30 MW时,建议开启火源附近4个排烟口且排烟量为220 m^3/s。

In order to find out the change of fire characteristic parameters in a single-side centralized smoke exhaust tunnel,the influence of the number of smoke vents on the smoke control,temperature distribution and smoke exhaust efficiency was studied by numerical simulation.The results show that:for the single side-centralized smoke exhaust tunnel,the smoke control effect is the best when four smoke vents are opened near the fire source,and the single-side smoke spreading length is within 105 m.Under all working conditions,the temperature at human eye height is below 60℃.When the number of smoke vents is more than 2,the influence of exhaust air volume on the temperature distribution in the tunnel is small.The total smoke exhaust efficiency increases with the increase of exhaust air volume under different smoke vent numbers,and the total smoke exhaust efficiency is more than 85%under different working conditions.The smoke exhaust efficiency is the highest when four smoke vents were opened near the fire source.When the heat release rate of the fire source is 30 MW,it is recommended to open four smoke exhaust vents near the fire source with the smoke exhaust volume of 220 m^3/s.