引用本文:张传福,曾建荣,文谋,张桂林,方海平,李燕,等.高架桥对街道峡谷内大气颗粒物输运的影响[J].环境科学研究,2012,25(2):159-164.
ZHANG Chuan-fu,ZENG Jian-rong,WEN Mou,ZHANG Gui-lin,FANG Hai-ping,LI Yan,et al.Influence of Viaducts on Dispersion of Air Particles in Street Canyons[J].Reserrch of Environmental Science,2012,25(2):159-164.]
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高架桥对街道峡谷内大气颗粒物输运的影响
张传福1, 曾建荣1, 文谋2, 张桂林1, 方海平1, 李燕1
1.中国科学院上海应用物理研究所核分析技术重点实验室;2.上海大学上海市应用数学和力学研究所
摘要:
随着我国城市汽车保有量的迅速攀升,城市中心区域的空气质量与生态环境急剧恶化.利用计算流体力学(CFD)数值模拟,研究了3种H/W(街道建筑物高度/峡谷宽度)下高架桥对街道峡谷内颗粒物扩散的影响.建立了街道峡谷内机动车尾气中颗粒物扩散模型,并给出了边界条件.采用标准k-ε模型与离散相模型对街道峡谷内部气流运动、颗粒物扩散及浓度分布进行了模拟计算,并计算了高架桥对风场及颗粒物扩散的影响.结果表明:H/W越大,街道峡谷内颗粒物浓度越高,同时颗粒物平均滞留时间越长.相对于没有高架桥的街道峡谷,高架桥附近区域风场变化明显,但对建筑物墙壁、地面及峡谷顶层处影响较小.街道峡谷内存在高架桥时,在墙壁较低处颗粒物浓度增加.
关键词:  街道峡谷  高架桥  颗粒物输运  CFD
DOI:
分类号:X513
基金项目:中国科学院知识创新工程重要方向性项目(KJCX3-SYW-N3);国家自然科学基金项目(11079049,11005141)
Influence of Viaducts on Dispersion of Air Particles in Street Canyons
ZHANG Chuan-fu1, ZENG Jian-rong1, WEN Mou2, ZHANG Gui-lin1, FANG Hai-ping1, LI Yan1
1.Key Laboratory of Nuclear Analysis Techniques,Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;2.Shanghai Institute of Applied Mathematics and Mechanics,Shanghai University,Shanghai 200072,China
Abstract:
Due to the increase of private vehicles in cities in China,high-level pollution is often detected in urban street canyons.Using a two-dimensional computational fluid dynamics(CFD) model,the environmental impacts of viaducts on the wind flow and dispersion of particles were studied under three different heightwidth ratios(H/W) of street canyons.Two-dimensional flow and dispersion of particles from traffic exhaust were modeled using the standard k-ε turbulence and discrete phase models.The results revealed that increasing the H/W effectively raised the particle concentration and mean particle residence time.The airflows were obviously disturbed at the region around the viaduct,whereas there was no significant change of the airflows near the walls of the buildings,the ground and the roofs of the canyon.The particle concentration at the lower part of the walls increases when a viaduct exists in the street canyons.
Key words:  street canyons  viaduct  particle dispersion  CFD