大气污染的数值模拟

为比较集中供热与分散供热对重庆涪陵地区的大气污染影响的差异,采用计算流体力学软件PHOENICS,通过计算机模拟的方法得出该地区大气污染物(SO2,PM10)的基本分布情况,结果表明,集中供热的污染源面积较大,污染的扩散方向受城市的主导风向影响较大,污染物浓度向扩散方向的两旁下降得较快,该区中心主要小区的污染物浓度从源强的5%降低到1%;而且集中供热产生的污染面积大约只有分散供热的20%,受污染的区域减小,特别是对居民区等人口密集区的污染大大降低了.并从对城市大气污染的角度论证在该地区采用集中供热的优势.同时证明使用一些较为成熟的流体力学软件进行计算机模拟能够为城市的大气污染分析提供一个较为准确而便利的手段.

Numerical Simulation of Air Pollution

To compare the difference of air influences in Fuling county between adopting Central heating at Longqiao power station and dispersing the heating all around the county,the authors simulate the distributing of the city air pollution(SO_(2),PM_(10)) with the computational fluid dynamics software-PHOENICS.The simulation results show that the pollution source are much wider.Because the main reason infecting the diffused of pollution is the city dominant wind,the decrease of the pollution along the side of city dominant wind is tremendous,the percentage of the pollution recedes from 5% to 1%,and the polluted area of the central heating is 20% of the area of separate heating,especially the pollution of the area with high population is decreasing remarkably such as the residential area.The simulation has proven the advantage of the central heating on the point of the air pollution.In the meanwhile,computer simulation is an accurate and convenient means to help analyze air pollution of urban.