【摘要】 基于三维的对流-扩散方程,采用50 m×50 m×20 m的高分辨率网格对广州市机动车排放污染扩散的宏观分布状况进行了数值模拟研究,应用有限体积法数值求解上述方程。模拟过程综合考虑了广州市的路网结构、交通流和路网线源排放强度等因素,进行了均匀风速的简单气象条件试算。结果表明,机动车排放污染物浓度随交通流量而变化,随高度增加而下降,上风向污染物浓度大于下风向,模拟结果与实际污染情况具有较好的一致性。更多还原

【Abstract】 Based on the convection-diffusion equation,three-dimensional dispersion of motor vehicle emission pollutants were modeled using high-resolution grid spacing by 50×50×20 meters.The convection-diffusion equation was solved numerically using the finite volume method.Several factors were taken into account comprehensively including the distribution of roads system,the traffic flow,line source strength,and so on.Specially,two computational analog for windiness and without wind were taken example for a trial.The results show that motor vehicle emission pollutant concentrations typically follow the traffic flow rate.Pollutant concentrations decline as the height increases,and are higher on the leeward side than on the windward side.Simulation predictions agree reasonably well with field measurements.更多还原