对流边界层中高架烟流扩散的大涡模拟研究  

Study on a Large Eddy Simulation of Elevated Plume Dispersion in the Convective Boundary Layer

作　　者：苗世光[1] 蒋维楣[1] 姚克亚[2] 

机构地区：[1]南京大学大气科学系 [2]中国科技大学地球和空间科学系

出　　处：《中国科学技术大学学报》2001年第5期535-542,共8页JUSTC

基　　金：国家自然科学基金 (4 9775 2 5 7和 49975 0 0 9)资助项目

摘　　要：论文用大涡模拟技术对对流边界层中高架烟流的扩散进行了模拟 .在对流边界层中对高斯扩散模式的使用进行了修正 .由Willis等 ( 1 978)的对流槽扩散实验数据求出虚拟源高 ,代替高斯烟流扩散公式中的源高 ,由此求得的横风向积分浓度分布与实验结果和数值模拟结果吻合较好 .并用KNRC试验№ 52的资料作了验证 ,结果表明The dispersion of elevated plume in the convective boundary layer(CBL) is calculated with the aid of a large eddy model and the modification of Gaussian dispersion model in the CBL is conducted. The source height of Gaussian dispersion model is replaced with the virtual source height calculated from the convective tank dispersion experiment of Willis et al.(1978). It is found that the distribution of cross wind integrated concentration(CWIC) from this method agrees well with the experimental and numerical simulation results. It is then tested with №52 data from KNRC field observation, and the result indicates that the modified Gaussian dispersion model is very good in use.

关 键 词：对流边界层 烟流扩散 大涡模拟 扩散参数 高斯扩散模式 大气边界层 污染物 气象场结构 

分 类 号：X169[环境科学与工程—环境科学]