街道峡谷内细微颗粒物扩散特性的DPM数值模拟  

Numerical simulation of fine particles dispersion in urban street canyon based on DPM model

作　　者：付志民[1] 孙在[1] 杨文俊[1] 谢小芳[1] 

机构地区：[1]中国计量学院计量测试工程学院,浙江杭州310018

出　　处：《中国计量学院学报》2011年第4期322-326,共5页Journal of China Jiliang University

基　　金：浙江省自然科学基金资助项目(No.Y6090607)

摘　　要：应用离散相模型(DPM)对城市中典型的街道峡谷内细微颗粒污染物浓度场进行了模拟,计算湍流模型选择标准k-ε双方程模型.计算结果表明,城市风场作用于街谷内导致涡旋流动,进而影响颗粒物的扩散分布.背风侧壁面颗粒物的浓度场呈现明显的"爬墙效应".不同几何结构影响颗粒物的浓度场,递增型街谷模型更有利于颗粒污染物的扩散.Based on the discrete phase model（DPM）,a simulation was carried out to study fine particles dispersion and their concentration in different kinds of typical street canyon.In the simulation,a standard k-ε two-equation model was used as turbulence model.The numerical results indicated that due to urban wind flow,the air in the street canyon presented vortex flow,dispersion and distribution of fine particles were changed.The concentration showed ＇climbing wall effect＇.The aspect ratio of street canyon had crucial effect on fine particle concentration distribution.Moreover,the concentration in street canyon with stepped-up notch configuration is lower than others.

关 键 词：街道峡谷 离散相模型 数值模拟 细微颗粒物 

分 类 号：X169[环境科学与工程—环境科学]