街道峡谷内汽车排放污染物浓度分布的观测与数值模拟

在上海某典型街道峡谷内按一定的空间布点,在一定时段内同时对各布点进行采样并做一氧化碳浓度分析,同时记录车辆种类、车流量、气象条件等,分析街道峡谷内污染物浓度的分布.运用风向频率加权(WDFW)方法,结合大气流动和污染物扩散的CFD模型进行数值模拟计算.结果表明,数值模拟结果和现场观测结果较吻合,建筑物低的一侧污染物浓度远高于建筑物高的一侧污染物浓度,两侧的污染物浓度随着高度的增加而降低.

FIELD MEASUREMENT AND NUMERICAL SIMULATION FOR POLLUTANT DISPERSION FROM VEHICULAR EXHAUST IN STREET CANYON

A field measurement in a street canyon in Shanghai was conducted for analyzing the concentration of CO in several locations at both sides of the street.Traffic parameters,topography and meteorological parameters were simultaneously measured.CFD numerical simulation coupling with the wind direction frequency weighted(WDFW) method was carried out based on the conditions that were measured.It was shown that the simulated results have a good agreement with the field experimental data and the concentration of CO at the side of the lower building is much higher than that of the higher building,and the concentration of CO at both sides(decreases) with the increase of the height of the buildings.