公路隧道通风空气交叉污染三维数值分析

在公路隧道的竖井送、排式纵向通风以及小近距隧道通风时，会出现排出的污染空气被吸入到邻近的竖井或隧道中的交叉污染，影响了隧道通风的效果。应用CFD（Computational Fluid Dynamics）技术对竖井送、排风口以及两个隧道洞口的空气交叉污染进行了详细的数值模拟分析。结果表明，竖井送、排风口和两个隧道间的污染随着送、排风口高差（或隧道出、入口纵向距离）及横向间距的增大逐渐减小。建议：在进行隧道通风设计时，竖井送、排风口轴线间距不小于50m，风口高差不小于5m；两隧道洞口轴线间距不小于40m，纵向距离不小于50m。

3D numerical analysis on air cross pollution of opening and shaft in ventilation of highway tunnel

When the sending and exhausting shaft on the short distance tunnels is longitudinally ventilated, the exhaust air from a shaft will be absorbed into the proximity shaft or tunnel, so the cross pollution will occur, the ventilation effect will be impacted. The numerical simulation and analysis by CFD software shows that the pollution between inlet and outlet of shaft or tunnel will be reduced gradually when the distance between inlet and outlet of shaft or tunnel is increased. It is suggested that the proper axial space length between the air outlet and inlet of the shaft should not be less than 50 m and the air outlet should be 5 m higher than the air inlet at least, and the proper axial space length between the two tunnel openings should not be less than 40 m and the longitudinal space length should not be less than 50 m at least. 3 tabs, 6 figs, 6 refs.