Effect of greening layout and wall heating on pollutant dispersion inside street canyon
The standard k-ε model 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.
street canyonwall heatinggreening layoutpollutant dispersionair exchange rate
万方数据
维普
