基于FDS的某公路隧道侧向集中排烟系统研究

Study of Lateral Concentrated Smoke Exhaust System in a Highway Tunnel Based on FDS

利用FDS火灾动力学模拟软件对某公路隧道进行了模拟试验,研究了隧道侧向集中排烟系统中排烟口面积、排烟口排列方式、不同排烟风量以及纵向通风对烟气蔓延范围、烟气温度场分布、排烟口流量以及排烟口速度等对排烟效果的影响。结果表明,均匀排列方式的排烟效果优于按组排列的方式,排烟效率和排烟效能随着排烟风量的增加呈现出先增后减的趋势,因此,可得到较为合理的排烟口参数、排烟风量及较优的纵向风速,为采用侧向集中排烟系统的公路隧道在设计和研究排烟方案时提供一定的参考依据。

The FDS fire dynamics simulation software is used to carry out simulation tests to a highway tunnel to study the impact of transverse smoke exhaust system in terms of area of the exhaust outlet,arrangement of exhaust outlets,different exhaust air volume and longitudinal ventilation system in terms of the smoke propagation range,distribution of smoke temperature field,smoke outlet volume and extracting speed on the effect of smoke exhaust effect.The results show that the effect of uniform arrangement of the smoke is better than that of the arrangement in rows.The efficiency of smoke extraction and smoke exhaust efficiency show a trend of increasing first and then decreasing with the increase of exhaust air volume.Based on this,a more reasonable row can be obtained.The parameters of smoke outlet,exhaust smoke volume and better longitudinal wind speed provide certain reference for designing and researching smoke exhausting schemes for highway tunnels using lateral centralized smoke extraction system.