中文摘要：

对于隧道群中相距较近的毗邻隧道,其上游出口污染空气会对下游隧道产生二次污染,因此在下游隧道需风量计算中应考虑上游隧道的污染物排放影响。以Realizable k-ε三维紊流模型及多组分扩散传输为物理计算模型,采用FLUENT流体计算软件模拟了山西临离隧道群中的白家山隧道无风时和有风时上游隧道出口污染空气对下游隧道的影响。结果显示,在无风情况下,毗邻隧道相距应大于400m以上,才不会对下游隧道造成污染。白家山1号隧道出口射流风速小于3m/s时,可以不考虑其对下游隧道的影响。

英文摘要：

Foradjacent tunnels in tunnel group, the air pollution in upstream will produce secondary pollution to downstream tunnel. So the calculation of required quantity of fresh air in downstream tunnel should consider the pollution emission of upstream tunnel. With realizable k-epsilon 3D turbulent flow and the multi-component diffusion transfer as physical calculation model, the article uses FLUENT model to simulate the impact of pollution air from upstream export on downstream tunnel of Baijia Mountain in the Linli tunnel group in Shanxi province when it＇s windy and windless. The results show that when there is no wind, adjacent tunnel will not produce secondary pollution on the condition of the distance longer than 400m. For Baijia Mountain, the impact can be ignored when the wind velocity of upstream tunnel less than 3m/s.