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城市街区污染散布的数值模拟与风洞实验的比较分析
引用本文:蒋维楣,苗世光,刘红年,王晓云.城市街区污染散布的数值模拟与风洞实验的比较分析[J].环境科学学报,2003,23(5):652-656.
作者姓名:蒋维楣  苗世光  刘红年  王晓云
作者单位:1. 南京大学大气科学系,南京,210093
2. 北京市气象局,北京,100089
基金项目:《北京城市规划建设与气象条件及大气污染关系研究》(国家科技部攻关项目 96 92 0 34 0 7),教育部博士点基金项目 (2 0 0 0 0 2 84 18)
摘    要:将专门设计的一项中性层结条件下风洞的污染物浓度测量实验,与已建城市小区尺度模式在相同条件下的污染扩散模拟结果进行了比较分析.分析了该模式流场模拟的有效性.结果表明:总体上,数值模拟与风洞实验结果符合较好;进一步分析发现,数值模拟结果中建筑物背风侧空腔区湍涡的中心比风洞实验结果略高,空腔区的范围比风洞实验所示范围大,建筑物迎风侧位移区比风洞实验所示小.此差异可能是由两者边界条件的不同引起的.

关 键 词:城市街区  污染  散布  数值模拟  风洞实验  空腔区  迎风侧位移区  大气环境  气象条件
文章编号:0253-2468(2003)05-0652-05
收稿时间:2002/9/10 0:00:00
修稿时间:2002年9月10日

Comparison and analysis of pollution modeling of a city sub-domain scale model with wind tunnel experiment
JIANG Weimei,MIAO Shiguang,LIU Hongnian and WANG Xiaoyun.Comparison and analysis of pollution modeling of a city sub-domain scale model with wind tunnel experiment[J].Acta Scientiae Circumstantiae,2003,23(5):652-656.
Authors:JIANG Weimei  MIAO Shiguang  LIU Hongnian and WANG Xiaoyun
Institution:Department of Atmospheric Sciences, Nanjing University, Nanjing, 210093,Department of Atmospheric Sciences, Nanjing University, Nanjing, 210093,Department of Atmospheric Sciences, Nanjing University, Nanjing, 210093 and Beijing Meteorological Bureau, Beijing, 100089
Abstract:In this paper, the analysis and validation of pollutant diffusion modeling of a city sub-domain scale model are done using the measurement data of pollutant concentration in a special designed wind-tunnel experiment, and the validation of flow modeling of this model is analyzed. It shows that, (1) the result of numerical simulation is in good agreement with that from wind-tunnel experiment, the trend of them are almost consistent, and the comparison statistics are very good, so a conclusion can be drawn that this model can simulate the diffusion of pollutant from traffic sources very well. (2) Further analysis shows that, as a whole the flow field of numerical simulation is in reason. The center of cavity zone from numerical simulation is higher than that from wind-tunnel experiment, and the area of cavity zone is larger than that from wind- tunnel experiment, the displacement zone is smaller than that from wind- tunnel experiment. The reason of this difference may lie on wind-tunnel experiment and numerical simulation. This study suggests that, the method of using wind-tunnel experiment and numerical simulation simultaneously to study the meteorological field and pollutant diffusion in city sub-domain is a practical and efficient approach, and these two methods benefit from each other. Especially, wind- tunnel experiment can supply enough and efficient data to numerical simulation for validation using, it is absorbing to urban environment research.
Keywords:urban sub-domain  pollutant diffusion  numerical simulation  wind tunnel experiment  model validation  
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