Abstract: The street is one of the most important public spaces for urban residents to engage in outdoor activities. It is beneficial to residents’ health by improving the air quality of the street environment and enhancing the comfort of residents' outdoor activities. Based on a computational fluid dynamics method, the paper takes the Zhongshan Road Block in Wuhan as an example, and the characteristics of vehicle exhaust pollutant dispersion in Zhongshan Avenue are numerically simulated by considering the effects of pollution sources on three urban roads and the ambient crosswind in different seasons. It is found that the concentration of pollutants is very high at a height of 1.7 m, and the pollutants display a continuous linear distribution. The urban internal corner space, the pedestrian space at the intersection, and the windward surface of the street are relatively lightly polluted, and the pedestrian space on the street is significantly polluted. In view of the above research, specific countermeasures are proposed from the aspects of street building function, building plane form and building façade form.

Key words: street canyon, building fa?ade, pollutant dispersion, computational fluid, numerical simulation, control strategy

摘要： 街道是城市居民进行室外活动的重要公共空间之一。改善街道环境空气质量，增强居民室外活动的舒适度，有利于居民身体健康。基于计算流体力学的方法，以武汉市中山大道街区为例，考虑三条城市道路污染源及不同季节的风环境，模拟分析中山大道街区尾气扩散效果。研究结果表明，街道1.7m高度处污染物浓度非常高，污染物呈连续性线状分布特征。城市阴角空间、交叉口人行空间、街道迎风面空间受污染相对较轻，而街道步行空间受污染严重。针对以上研究，从临街建筑功能、建筑平面形态、建筑立面形态等方面提出了具体的应对策略。

关键词: 街道峡谷, 临街建筑, 污染物扩散, 计算流体力学, 数值模拟, 控制策略