On the Correlation of Air and Pollutant Exchange for Non-uniform Street Canyons
Air flow and pollutant dispersion in idealized non-uniform street canyons, composed of separated stepup and stepdown notches and a uniform notch in the middle, are investigated with Large-eddy Simulations (LES). Pollutant exchange rate is calculated at the roof level of the low buildings. Large scale vertical air movements are found in non-uniform street canyons, resulting of the increase of average velocity influence on pollutant exchange rate and the enhancement of pollutant escaping efficiency from the canyon to the aloft air. Sensitive analysis of average pollutant concentration at the pedestrian level to the height differences of buildings in the stepup and/or stepdown notches is conducted. Results show that even if only one floor of the buildings on the opposite sides of the canyon of the height difference, but also can cause differences in the average concentration at the pedestrian level of 20％ compared to the uniform case.
Street canyon Building layout Air exchange rate Pollutant exchange rate Large eddy simulation
Yun-Wei Zhang Zhao-Lin Gu Jian-Ying Jiao
School of Energy and Power Engineering,Xian Jiaotong University,Xian,710049 Department of Environmental Science and Technology,School of Human Settlements and Civil Engineering School of Mechanical Engineering,Xian Jiaotong University,Xian 710049,P.R. China
国际会议
西安
英文
242-249
2011-08-17（万方平台首次上网日期，不代表论文的发表时间）