城市中心街道交通隧道废气排放模拟

利用风洞试验、模式预测和现场监测的方法，对某城市中心街道交通隧道汽车废气的扩散特征作了模拟研究。结果表明，环境中汽车尾气污染程度与隧道中汽车行驶工况、车流量、气象条件（温度、风速、风向）等诸多因素有关。随着环境风速减小或环境气温升高，隧道外废气浓度显著增加。隧道出口至离出口90m处的引道范围是污染物高浓度区域，但废气排放对引道两侧离地面较高的匝道影响较小。对模式预测结果和风洞测量结果、现场监测结果作了比较，一致性良好

The simulation on diffusion of waste gas from the centre area underground traffic tunnel in urban.

In this paper,diffusion of vehicular tail gas from the underground traffic tunnel was simulated by the method of using the wind tunnel experiment and model calculation and spot monitoring.It shows that,the pollution degree of vehicular tail gas in air is greatly related to traffic conditions,amount of automobiles and meteorological conditions,such as wind speed,wind direction and air temperature.The concentration of waste gas became higher in the condition of higher air temperature or lower wind speed.The region of higher concentration (>10mg/m 3) is about 90m long from the exit of tunnel.The comparison between the results of tunnel,monitoring and modeling prediction has been done and their accordance is good.