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城市街道峡谷污染物扩散的CFD数值模拟

发表时间:2010-12-31  浏览量:1840  下载量:798
全部作者: 韩晶晶,王丽萍
作者单位: 中国矿业大学环境与测绘学院
摘 要: 利用计算流体力学(computational fluid dynamics, CFD)软件Fluent,采用标准k-ε模型对城市街道峡谷的污染物扩散进行模拟,并对在不同自由来流风速与不同线源源强条件下的街谷内气态污染物浓度分布进行模拟和分析。结果表明:街谷内形成的顺时针气流旋涡使污染物大多集中在街谷背风面,且谷底的污染物浓度大于谷顶的浓度。风速的改变不会对街谷内的气流场产生显著影响,但近地面处的污染物浓度会随风速的增大而减小。线源源强在一定程度上影响着街谷内气流场的结构,从而使街谷内的污染物浓度分布发生变化。研究结果还表明:CFD软件的模拟结果对城市街区大气污染问题的研究有现实指导意义。
关 键 词: 大气污染防治工程;污染物浓度场;CFD数值模拟;街道峡谷
Title: CFD numerical simulation of the pollutant proliferation in urban street canyon
Author: HAN Jingjing, WANG Liping
Organization: School of Environment Science and Spatial Informatics, China University of Mining & Technology
Abstract: The pollutant proliferation in the urban street canyon was simulated in this paper applying standard k-ε model by the help of computational fluid dynamics (CFD) software Fluent. The density distribution of gaseous pollutant in the urban street canyon was analyzed under the conditions of different free flow wind speed and different line source strength. The result indicated that the clockwise gas whirlpool formed in the street canyon causes the pollutant to mostly concentrate in the street canyon leeward side, and pollutant density at the bottom of the canyon is bigger than the density at the top. The wind speed change cannot have the remarkable influence to the street valley gas flow field, but the pollutant density near ground in the canyon will reduce with the increasing wind speed. The line source strength affects the structure of the gas flow field in street canyon to a certain extent, thus causes the pollutant density distribution in the street valley changed. The research results also indicated that the simulation results of computational fluid dynamics software has practical significance to the urban atmospheric pollution problem.
Key words: air pollution control engineering; pollutant concentration field; CFD numerical simulation; street canyon
发表期数: 2010年12月第24期
引用格式: 韩晶晶,王丽萍. 城市街道峡谷污染物扩散的CFD数值模拟[J]. 中国科技论文在线精品论文,2010,3(24):2466-2469.
 
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