| A Laboratory Model for the Flow in Urban Street Canyons Induced by Bottom Heating |
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| 作者姓名： | LIU Huizhi LIANG Bin ZHU Fengrong ZHANG Boyin SANG Jianguo |
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| 作者单位： | [1]LAPC,InstituteofAtmosphericPhysics,ChineseAcademyofSciences,Beijing100029 [2]StateKeyLaboratoryforStudiesofTurbulenceandComplexSystems,PekingUniversity,Beijing100871 [3]DepartmentofAtmosphericSciences,PekingUniversity,Beijing100871 |
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| 摘 要： | Water tank experiments are carried out to investigate the convection flow induced by bottom heating and the effects of the ambient wind on the flow in non-symmetrical urban street canyons based on the PIV (Particle Image Visualization) technique. Fluid experiments show that with calm ambient wind,the flows in the street canyon are completely driven by thermal force, and the convection can reach the upper atmosphere of the street canyon. Horizontal and vertical motions also appear above the roofs of the buildings. These are the conditions which favor the exchange of momentum and air mass between the street canyon and its environment. More than two vortices are induced by the convection, and the complex circulation pattern will vary with time in a wider street canyon. However， in a narrow street canyon， just one vortex appears. With a light ambient wind, the bottom heating and the associated convection result in just one main vortex. As the ambient wind speed increases, the vortex becomes more organized and its center shifts closer to the leeward building.
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| 关 键 词： | 地面加热 拖曳式水槽 实验研究 流动 大气动力学 城市 街谷流场 对流 非对称性 PIV 激光粒子成像速度场测量系统 |
| 收稿时间： | 30 August 2006 |
A Laboratory model for the flow in urban street canyons induced by bottom heating |
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| LIU Huizhi,LIANG Bin,ZHU Fengrong,ZHANG Boyin,SANG Jianguo.A Laboratory Model for the Flow in Urban Street Canyons Induced by Bottom Heating[J].Advances in Atmospheric Sciences,2003,20(4):554-564. |
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| Authors: | Huizhi Liu Bin Liang Fengrong Zhu Boyin Zhang Jianguo Sang |
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| Affiliation: | LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory for Studies of Turbulence and Complex Systems, Peking University, Beijing 100871,State Key Laboratory for Studies of Turbulence and Complex Systems, Peking University, Beijing 100871,State Key Laboratory for Studies of Turbulence and Complex Systems, Peking University, Beijing 100871,Department of Atmospheric Sciences, Peking University, Beijing 100871 |
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| Abstract: | Water tank experiments are carried out to investigate the convection flow induced by bottom heatingand the effects of the ambient wind on the flow in non-symmetrical urban street canyons based on thePIV (Particle Image Visualization) technique. Fluid experiments show that with calm ambient wind,the flows in the street canyon are completely driven by thermal force, and the convection can reach theupper atmosphere of the street canyon. Horizontal and vertical motions also appear above the roofs ofthe buildings. These are the conditions which favor the exchange of momentum and air mass between thestreet canyon and its environment. More than two vortices are induced by the convection, and the complexcirculation pattern will vary with time in a wider street canyon. However, in a narrow street canyon, justone vortex appears. With a light ambient wind, the bottom heating and the associated convection resultin just one main vortex. As the ambient wind speed increases, the vortex becomes more organized and itscenter shifts closer to the leeward building. |
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| Keywords: | flow in non-symmetrical urban street canyons bottom heating water tank |
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