Numerical Study on the Impact of Ground Heating and Ambient Wind Speed on Flow Fields in S

Numerical Study on the Impact of Ground Heating and Ambient Wind Speed on Flow Fields in Street

Canyons

LI Lei;YANG Lin;ZHANG Li-Jie;JIANG Yin

【期刊名称】《大气科学进展（英文版）》 【年(卷),期】2012(029)006

【摘要】The impact of ground heating on flow fields in street canyons under different ambient wind speed conditions was studied based on numerical methods.A series of numerical tests were performed,and three factors including height-to-width (H/W) ratio,ambient wind speed and ground heating intensity were taken into account.Three types of street canyon with H/W ratios of 0.5,1.0 and 2.0,respectively,were used in the simulation and seven speed values ranging from 0.0 to 3.0 m s-1 were set for the ambient wind speed.The ground heating intensity,which was defined as the difference between the ground temperature and air temperature,ranged from 10 to 40 K with an increase of 10 K in the tests.The results showed that under calm conditions,ground heating could induce circulation with a wind speed of around 1.0 m s-1,which is enough to disperse pollutants in a street canyon.It was also found that an ambient wind speed threshold may exist for street canyons with a fixed H/W ratio.When ambient wind speed was lower than the threshold identified in this study,the impact of the thermal effect on the flow field

was obvious,and there existed a multi-vortex flow pattern in the street canyon.When the ambient wind speed was higher than the threshold,the circulation pattern was basically determined by dynamic effects.The tests on the impact of heating intensity showed that a higher ground heating intensity could strengthen the vortical flow within the street canyon,which would help improve pollutant diffusion capability in street canyons. 【总页数】11页(1227-1237) 【关键词】

【作者】LI Lei;YANG Lin;ZHANG Li-Jie;JIANG Yin

【作者单位】Shenzhen National Climate Observatory, Meteorological Bureau of

Shenzhen

Municipality,

Shenzhen 518040;Shenzhen

Meteorological Service Center, Meteorological Bureau of Shenzhen Municipality, Shenzhen 518040;Shenzhen National Climate Observatory, Meteorological

Bureau

of

Shenzhen

Municipality,

Shenzhen

518040;Shenzhen National Climate Observatory, Meteorological Bureau of Shenzhen Municipality, Shenzhen 518040 【正文语种】中文 【中图分类】 【文献来源】

https://www.zhangqiaokeyan.com/academic-journal-cn_advances-atmospheric-sciences_thesis/0201253029255.html

【相关文献】

1.Performance Study Based on Inner Flow Field Numerical Simulation of Magnetic Drive Pumps with Different Rotate Speeds [J], KONG Fanyu; SHEN Xiaokai; WANG Wenting; ZHOU Shuiqing

2.Numerical Analysis of Electromagnetic Field and Flow Field in High Casting Speed Slab Continuous Casting Mold With Traveling Magnetic Field [J], WANG Hong-dan; ZHU Miao-yong; YU Hai-qi

3.Numerical study of internal flow field and flow passage improvement of an inlet particle separator [J], Florian PAOLI; Tong WANG

4.Numerical study of flow and heat transfer during oscillatory blood flow in diseased arteries in presence of magnetic fields [J], A. SINHA; J. C. MISRA

5.Numerical Investigation of Flow Fields in Inductively Coupled Plasma Wind Tunnels [J], YU Minghao; Yusuke TAKAHASHI; Hisashi KIHARA; Ken-ichi ABE; Kazuhiko YAMADA; Takashi ABE

以上内容为文献基本信息，获取文献全文请下载