绿化空间布局及壁面加热条件对街道峡谷内污染物扩散的影响  

Effect of greening layout and wall heating on pollutant dispersion inside street canyon

作　　者：梁千逢 尹作宏 姚成 蒋欣峰 杨慧琳 张震 罗杨[1] LIANG Qianfeng;YIN Zuohong;YAO Cheng;JIANG Xinfeng;YANG Huilin;ZHANG Zhen;LUO Yang(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学环境与建筑学院,上海200093

出　　处：《能源研究与信息》2024年第2期63-73,共11页Energy Research and Information

基　　金：国家自然科学基金资助项目(12202279)。

摘　　要：采用经风洞实验验证的标准k−ε数值模型,模拟了绿化空间布局及壁面加热条件对街道峡谷内流场和污染物扩散的影响。考虑了3种绿化组合方式与4种壁面加热条件,并采用无量纲浓度K与空气交换率RACH分别对街道峡谷内污染情况与通风性能进行评估。结果表明,不同的绿化空间布局和壁面加热条件会改变街道峡谷内流场和污染物浓度分布。选择绿化结合布局时,应尽量选择绿墙和绿篱的组合以减弱绿化阻塞作用对污染物扩散的不利影响。背风面加热和迎风面加热对街道峡谷的通风能力提升作用并不明显,而三壁加热能明显改善街道峡谷的通风性能。The standard k-εmodel validated by wind tunnel experiments was used to study the effect of greening layout and wall heating on the flow field and pollutant dispersion in the street canyon.Three types of greening configurations and four kinds of wall heating modes were considered in this study,and the pollutants distribution and ventilation performance in street canyon were evaluated by dimensionless concentration of K and air exchange rate of RACH,respectively.Results show that the greening configuration and wall heating mode can influence the flow field and pollutant concentration distribution in the street canyon.The combination of green wall and hedge should be selected to reduce the adverse effects of greening on pollutant diffusion when the layout of greening combination is used. Meanwhile, the leeward and windward wall heating have no obvious effect on the improvement of ventilation capacity in street canyon, while the significant improvement of ventilation capacity is achieved by three-wall heating.

关 键 词：街道峡谷 壁面加热 绿化配置 污染物扩散 空气交换率 

分 类 号：X51[环境科学与工程—环境工程]