In a road tunnel with incoming and outgoing slip roads, it is a problem to control the air pollution in the tunnel, to which the tunnel constructors must pay great attention, especially when the road tunnel is long. A prerequisite to solving the polluting problem is the ability to accurately represent the ventilation in the tunnel. In this article, an engineering method is used to calculate the airflow of some normal tunnels with simple measure to control the pollution in them. A diffuse equation is involved to describe the pollution distribution of the road tunnel. And a strategy is given to solve polluting problem of more complex road tunnel.
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