[1]秦成君,宋翀芳,王世杰,等.城市高架桥街谷空气环境和污染物扩散的数值模拟[J].华侨大学学报(自然科学版),2018,39(5):714-719.[doi:10.11830/ISSN.1000-5013.201801063]
　QIN Chengjun,SONG Chongfang,WANG Shijie,et al.Numerical Simulation of Air Environment and Pollutant Diffusion in Urban Viaduct Street Canyon[J].Journal of Huaqiao University(Natural Science),2018,39(5):714-719.[doi:10.11830/ISSN.1000-5013.201801063]
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城市高架桥街谷空气环境和污染物扩散的数值模拟()
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《华侨大学学报（自然科学版）》[ISSN:1000-5013/CN:35-1079/N]

卷:
第39卷
期数:
2018年第5期
页码:
714-719
栏目:
出版日期:
2018-09-20

文章信息/Info

Title:
Numerical Simulation of Air Environment and Pollutant Diffusion in Urban Viaduct Street Canyon
文章编号:
1000-5013(2018)05-0714-06
作者:
秦成君1;  宋翀芳1;  王世杰1;  赵敬源2
1. 太原理工大学 环境科学与工程学院, 山西 太原 030024;2. 长安大学 建筑学院, 陕西 西安 710061
Author(s):
QIN Chengjun1;  SONG Chongfang1;  WANG Shijie1;  ZHAO Jingyuan2
1. College of Environmental Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; 2. College of Architecture, Chang’an University, Xi’an 710061, China
关键词:
城市街谷;  高架桥;  十字路口;  污染物流场;  空气流场
Keywords:
urban street canyon;  viaduct;  crossroads;  pollutant concentration field;  air flow field
分类号:
X511
DOI:
10.11830/ISSN.1000-5013.201801063
文献标志码:
A
摘要:
采用Fluent 6.3数值模拟,研究含高架桥的十字路口在不同风向条件下,街谷内空气流场和污染物浓度场特征.模拟结果表明:当来流风向平行于高架桥主干道方向时,来流在高架桥上引桥下方收缩形成低风速涡旋,造成高浓度CO淤积,随着高架桥水平路段的延伸,高架桥下方CO浓度逐渐降低,而高架桥上方行人呼吸高度处CO始终保持极高浓度;当来流风向垂直于高架桥主干道方向时,高架桥改变了污染物的爬墙效应,其下方主干道迎风面和背风面CO不易扩散,保持较高浓度;行人应避免长期在高架桥下方、街谷背风面及十字路口拐角处停留,以减轻街谷内污染物对人体造成的伤害;十字路口处引入高架桥会改变污染源的位置、强度,改变来流风的流动特性,从而影响街谷中污染物的扩散.
Abstract:
The characteristics of air flow field and pollutant concentration field in the street canyon were studied under different wind directions in the viaduct crossroads using Fluent 6.3 numerical simulation. The simulation results show that when the direction of the incoming flow was parallel to the main street direction of the viaduct, the incoming flow shrank downwards and formed a low-velocity vortex, causing high concentration of CO deposition. With the extension of the viaduct horizontal section, the CO concentration gradually decreased, while CO at the upper pedestrian respiration level always maintained a very high concentration. When the incoming wind direction was perpendicular to the main street direction of the viaduct, the viaduct changed the climber-climbing effect of the pollutants, and the CO below the main windward and leeward was not easy to diffuse, to maintain a high concentration. Pedestrians should avoid long-term stay under the viaduct, the street leeward and the corner of the intersection stop to reduce the human body damage caused by the pollutants in the street canyon. The viaduct at the crossroads would change the flow characteristics of the flowing winds and the location and intensity of the pollution sources, thus affecting the proliferation of the pollutants in the street canyon.

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备注/Memo

备注/Memo:
收稿日期: 2018-01-22
通信作者: 宋翀芳(1974-),女,副教授,博士,主要从事大气颗粒物扩散及防治的研究.E-mail:424384295@qq.com.
基金项目: 国家自然科学基金资助项目(51678058)http://www.hdxb.hqu.edu.cn
更新日期/Last Update: 2018-09-20