环境工程学报2018，Vol.12Issue(4)：1135-1147,13.DOI:10.12030/j.cjee.201709111
道路路障对街道峡谷内污染物扩散的影响
Influence of roadside barriers on pollutant dispersion within street canyon
摘要
Abstract
This study has been investigated the effects of different road barrier arrangements (one central roadside barrier and two eccentric roadside barriers) and wind directions (α=0°,45°,90°) on vehicle exhaust pollutant dispersion in street canyon numerically.The numerical simulations use the standard k-ε turbulence model with Sct=0.3,results of which agreed well with the wind-tunnel experiments.It shows that two kinds of barriers arrangements can both effectively reduce the pollutant concentration in the footpath.Especially,the maximum reduction of 46.23％ were found at α=45°.Meanwhile,the wind direction angle α has a great impact on pollutant dispersion in street canyon.When α=90°,the worst ventilation has caused the worst air pollution in street canyon,and pollution mainly concentrated in the leeward side near the ground.The central roadside barrier can affect the pollutant dispersion in street canyon more significantly than two eccentric roadside barriers,especially for the former the pollutant concentration increased sharply in the central leeward side of the street canyon,while obviously decreased at the other locations.However,for two eccentric roadside barriers,they only improve the air quality in the footpath,while the pollutant concentrations were hardly affected at the other locations.关键词
道路路障/风向角/污染物扩散/街道峡谷/数值模拟Key words
roadside barrier/wind direction/pollutant dispersion/street canyon/numerical simulation分类
资源环境引用本文复制引用
黄远东,侯人玮,崔鹏义..道路路障对街道峡谷内污染物扩散的影响[J].环境工程学报,2018,12(4):1135-1147,13.基金项目
国家自然科学基金重点资助项目(51536006) （51536006）
