【摘要】 目的研究城市带廊道峡谷内气流运动和污染物扩散特征等对污染物扩散的影响.方法采用二维不可压N-S方程、标准的k-ε湍流模型、污染物对流扩散方程和SIMPLE算法,并用CFD软件进行模拟仿真.结果当迎风面建筑物低于背风面建筑物时,峡谷内污染物浓度比等高街道和迎风面建筑物较高街道高;峡谷内的旋涡结构形态受人行道高度的影响,不受人行道宽度和屋顶来流风速的影响;峡谷内部污染物浓度随污染物源强的升高而增大,随屋顶来风的增大而降低.结论不同结构形式的峡谷呈现不同的污染物浓度分布形态,廊道内始终是污染物积聚的区域,这对城市街道的规划与设计具有重要指导意义.更多还原

【Abstract】 In order to study the infection of the character of airflow and the pollutant dispersion in arcade urban canyons on pollutant diffusion,based on the incompressible Navier-Sokes equation,the turbulence model,the convection diffusion equation,and the SIMPLE arithmetic,the pervation characteristics are simulated by CFD software.The results showed that when the windward building is lower than the leeward building,the pollutant concentration in the canyons is higher than the other streets.The vortex structures in the canyon are affected by the height of the pavement,but the width of the pavement and the wind speed from the housetop have no effect on the vortex structures in the canyon.The concentration of polluting resource has proportional effect on the pollutant concentration in the canyon.In conclusion,different canyon structure has different pollutant distributing characters;the pollutant always concentrates in the arcade.This can be used as guidance to the programming and designing of the urban streets.更多还原