带人行拱廊城市街道机动车污染物扩散规律

运用风洞试验与数值模拟技术相结合的方法,以上海市金陵东路街道为对象,研究分析了带人行拱廊街道内部机动车污染物的传输扩散规律。研究结果表明:街道内部形成了一个顺时针的漩涡,涡心位置偏向街道上部,同时在街道迎风面处的拱廊里形成了一个逆时针漩涡;在建筑物背风侧仍然形成了"爬墙效应",由于人行拱廊的影响,街道内部污染物的总体水平比不带人行拱廊时要高出很多,两侧的人行拱廊里都形成了高污染区域,在背风侧人行拱廊里污染更为严重。

Investigation of Vehicle Pollutants Dispersion in an Urban Street Canyon Flanked with Arcade

In order to predict the vehicle impact on air quality in a city street,an investigation was carried out by numerical simulation and wind tunnel experiment to evaluate pollutant dispersion in an urban street canyon flanked with arcade.This paper presented some interesting results.A clockwise vortex with its core in upper part of street canyon forms within the urban street canyon flanked with arcade,and a counterclockwise vortex forms within the arcade near the windward side of buildings simultaneously.The "climbing wall effect" occurs at the leeward side of buildings.Because of the influence of the arcade,the general pollutant concentration in the street increases greatly,and the concentration within the arcade is very high especially at the leeward side.