沈炼, 韩艳, 唐春朝, 袁涛, 杨瑛, 匡希龙. 多因素作用下小区风环境风洞试验研究[J]. 工程力学, 2021, 38(5): 88-97. DOI: 10.6052/j.issn.1000-4750.2020.04.0270
引用本文: 沈炼, 韩艳, 唐春朝, 袁涛, 杨瑛, 匡希龙. 多因素作用下小区风环境风洞试验研究[J]. 工程力学, 2021, 38(5): 88-97. DOI: 10.6052/j.issn.1000-4750.2020.04.0270
SHEN Lian, HAN Yan, TANG Chun-chao, YUAN Tao, YANG Ying, KUANG Xi-long. STUDY ON WIND TUNNEL TEST OF WIND ENVIRONMENT UNDER THE INFLUENCE OF MULTIPLE FACTORS[J]. Engineering Mechanics, 2021, 38(5): 88-97. DOI: 10.6052/j.issn.1000-4750.2020.04.0270
Citation: SHEN Lian, HAN Yan, TANG Chun-chao, YUAN Tao, YANG Ying, KUANG Xi-long. STUDY ON WIND TUNNEL TEST OF WIND ENVIRONMENT UNDER THE INFLUENCE OF MULTIPLE FACTORS[J]. Engineering Mechanics, 2021, 38(5): 88-97. DOI: 10.6052/j.issn.1000-4750.2020.04.0270

多因素作用下小区风环境风洞试验研究

STUDY ON WIND TUNNEL TEST OF WIND ENVIRONMENT UNDER THE INFLUENCE OF MULTIPLE FACTORS

  • 摘要: 风环境风洞试验由于受到试验尺寸与试验设备的限制,很难获取高精度详尽的小区风场分布,加之我国对小区风环境研究还相对滞后,较大程度阻碍了当前绿色城市的发展。该文以长沙通用时代国际社区为研究背景,利用10 m (宽)×3 m (高)×21.0 m (长)大尺寸风洞,对不同来流形式、风速大小,有无高耸建筑与植被等因素影响下的小区风环境进行了全方位、多工况试验研究,获取了多因素影响下的小区风场详细分布。研究结论显示:均匀来流通过800 m长度的地表粗糙距离可产生与C类地貌来流较为一致的平均风剖面,但湍流度剖面还存在较大差异;低风速来流作用下小区无量纲风场分布随来流风速变化具有一定的波动,但来流风速大于7 m/s时,小区流场的无量纲风速分布趋于稳定;小区内部风场分布与邻近高耸建筑的位置和形态密切相关,高耸建筑会引起建筑周边风场加速。同时,植被能降低小区人行高度平均风速,对通用时代小区而言,10 m高大树、7 m高中树和5 m高小树可对小区平均风速分别造成12.8%、10.6%和7.2%的减速。

     

    Abstract: At present, due to the limitations of test size and test equipment, it is hard to obtain wind environment with high-accuracy and detailed wind field distribution by wind tunnel tests. Besides, the research on urban wind environment is relatively lagging behind in China, which impedes the rapid social development. The present paper performs a case study of Tongyong Shidai international community. A 10 m (width)×3 m (height)×21.0 m (long) wind tunnel is employed to obtain the detailed wind field distribution. And the impact factors, such as the inflow boundary, wind speed, wind direction angle, adjacent high-rise buildings and vegetation, are considered. The research results show that the uniform inflow and C-type geomorphic inflow can generate the same average wind profile, but turbulence intensity profiles are different. The flow field inside the community has some disturbance under low inflow velocity. As the inflow velocity is greater than 7 m/s, the flow field distribution tends to be stable. The shape of the adjacent high-rise buildings will change the residential area's wind field; Vegetation can reduce the average wind speed of pedestrian height. For the considered community, the large, medium and small size trees can reduce the average wind speed by 12.8%、10.6% and 7.2%, respectively.

     

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