【摘要】 为了研究建筑物不同屋顶结构对街道峡谷中汽车排放污染物扩散影响特性,采用RNGk-ε湍流模型方程及污染物对流扩散方程对其进行了二维数值模拟,得到了街道峡谷中机动车排放氮氧化物的流场和浓度场,从而证明了建筑物不同屋顶结构对街道峡谷中汽车排放污染物扩散确有明显影响作用。更多还原

【Abstract】 Two-dimensional numerical simulation of pollutant dispersion was conducted using the RNG k-ε turbulence model and the gas diffusion equation aiming to study the effect of different roof structures of street buildings on pollutant dispersion of automobiles in an urban street canyon.The airflow and the concentration of the pollutant gas(nitrogen oxides)released by automobiles in the canyon were analysed.Results prove that different roof structures of buildings have markedly influences on the pollutant dispersion of automobiles in the urban street canyon.更多还原