中文摘要：

轻型汽油车为主的城市地下道路,主要污染物为CO和NOx。多点进出城市地下道路的隧道结构特性影响主隧道污染物的排放与沿程累积迁移特性。本研究基于实际运营城市地下道路的实测结果,采用反问题方法反演计算出对流传质过程中的源项,重点定量分析分岔隧道结构对CO扩散特性的影响。计算结果表明,主隧道出口处CO总源项累积量平均值为0.37mg/m3s,合流匝道带入CO占总源项的4.8%,分流匝道带出的CO占总源项的5.9%。研究结果可为多点进出城市地下道路通风工程优化设计及环境影响评价提供方法参考。

英文摘要：

The main pollutants in the urban tunnel are CO and NOx, which are emitted by light -duty gaso- line vehicles. The structural characteristics of urban bifurcate tunnel affect the pollutant emission and migra- tion in the main tunnel. Based on the measurement results, the source term in the process of circulation is cal-culated with the anti - problem method, the influence of the bifurcated tunnel structure on the CO diffusion properties is analyzed quantitatively and emphatically. The results show that the cumulative mean of CO source term is 0.37mg/（m^3·s） at the exit of main tunnel. The CO brought in from confluence ramp accounts for 4. 8% of total pollutants source, and that taken out of shunt ramp accounts for 5.9% of total pollutants source. The results provide a method reference for ventilation engineering optimization design and environmental impact assessment in urban bifurcate tunnel.