Effect of Roughness Elements on the Wind Tunnel Simulation of Atmospheric Surface Layer

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Effect of Roughness Elements on the Wind Tunnel Simulation of Atmospheric Surface Layer

更新时间：2025-07-09

- Effect of Roughness Elements on the Wind Tunnel Simulation of Atmospheric Surface Layer
- Vol. 43, Issue 3, Pages: 87-91(2009)
- 作者机构：
  
  西安交通大学流体工程系,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： O357.4
- Online First：10 March 2009，
  
  Published：2009
- 稿件说明：
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Effect of Roughness Elements on the Wind Tunnel Simulation of Atmospheric Surface Layer[J]. 2009, 43(3): 87-91.
DOI：

Effect of Roughness Elements on the Wind Tunnel Simulation of Atmospheric Surface Layer[J]. 2009, 43(3): 87-91. DOI：

摘要

采用不同尺度、不同铺设密度的二维正方形粗糙元

在环境风洞中对大气表面层进行了模拟.使用粒子图像速度场仪对所模拟的大气表面层风速廓线、湍流强度进行了测量.结果表明:当粗糙元的铺设长度达到实验段入口高度的12倍以上时

依靠自然形成法所模拟的对数风速廓线高度可达实验段高度的60%; 空气动力学粗糙度Z

最高可达粗糙元尺度的0.4～0.5倍

且Z

随粗糙元铺设区到测量断面的距离呈指数变化; 同一高度上湍流强度随粗糙元铺设间距的增加而减小

当廓线高度达到实验段高度的40%以上时

湍流强度不随粗糙元大小及铺设密度的变化而变化

其大小为12%～13%.实际应用中

在已知所需Z

和摩阻风速U

的情况下

可通过粗糙元尺度及铺设密度的不同组合获得满足要求的大气表面层

并确定实验模型区的位置和实验段的入口风速.

Abstract

In the wind tunnel

the atmospheric surface layer was simulated by the naturally forming method with square-bar roughness elements having different height and different paving density. The atmospheric surface layer profiles and turbulence intensities were measured by particle image velocimetry. The results show that when the paving length is more than 12 times of the inlet height of the experimental section

and the profiles' logarithmic height can be 60% of the experimental section height. The maximum value of the aerodynamics roughness

is about 40%-50% of the roughness element height

and Z

changes exponentially with the distance from the last roughness elemen

t to model position. Moreover

at the same level

the turbulence intensities decrease with the increase of the paving distance. When the level reaches more than 40% of the experimental section height

the turbulence intensities are almost the same. Our results indicate that

in the practical application

the required atmospheric surface layer can be achieved by the different combination of roughness element height with paving density

and the experimental model position and the section inlet velocity can be determined if the needed Z

and U

are known.

关键词

Keywords

references

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FANG C, SILL B L. Aerodynamic roughness length: correlation with roughness elements [J]. Journal of Wind Engineering and Industrial Aerodynamics, 1992, 41(1):449-460.

王元,张鸿雁.大气表面层与风沙现象相似参数的研究[J].中国沙漠,1994,14(1):10-16.

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