隔板对街道峡谷内污染物扩散的影响

The Influence of Baffle Plate on Air Pollutant Diffusion Inside an Street Canyon

基于二维k-ε湍流模型,模拟分析不同挡板设置位置对街道峡谷模型内部的气流分布及污染物扩散的影响程度。结果表明:在街道峡谷来风方向设置挡板对改变峡谷内部流场及污染物浓度的分布情况有显著影响。在与墙面近距离设置挡板时,有利于峡谷内部污染物的扩散;当挡板设置距离较大时,污染物扩散改善效果不明显,甚至出现不利于污染物扩散的气流分布。因此,合理设置挡板位置对提高峡谷内部空气质量作用明显。

Two-dimensional numerical simulations were performed to investigate the impacts of vertical baffle plate on flow and pollutant dispersion inside an isolated street canyon.The numerical results reveal that vertical plate has significant effect on flow patter and pollutant distribution.When the baffle plate is set close to leeward wall,it is conducive to the diffusion of pollutants in the canyon.The improvement effect of pollutant diffusion is not obvious under the condition of baffle plate is set far from the leeward wall.It is not benefit to pollutant diffusion when baffle plate is placed in the middle of the street canyon.Therefore,reasonably setting the baffle position has an obvious effect on improving the air quality inside the canyon.