A wind tunnel simulation of the turbulence fields behind upright porous wind fences
文献类型：期刊论文
| 作者 | Dong, Zhibao1,2; Luo, Wanyin1; Qian, Guangqiang1; Lu, Ping1; Wang, Hongtao1 |
| 刊名 | JOURNAL OF ARID ENVIRONMENTS
 |
| 出版日期 | 2010-02-01 |
| 卷号 | 74期号:2页码:193-207 |
| 关键词 | Windbreaks Turbulence Leeward airflow Fence porosity |
| ISSN号 | 0140-1963 |
| DOI | 10.1016/j.jaridenv.2009.03.015 |
| 通讯作者 | Dong, Zhibao(zbdong@lzb.ac.cn) |
| 英文摘要 | The turbulence field of airflow behind a porous fence has significant impacts on the fence's shelter efficiency. We used particle image velocimetry to obtain detailed velocity measurements behind two-dimensional porous fence models in a wind tunnel simulation, and analyzed the turbulence fields revealed by these measurements. We tested fence models with 11 porosities: 0.05, 0.1, 0.15, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, and 0.9, and analyzed seven typical fences. The reduction of mean streamwise velocity behind all fences increased with decreasing fence porosity, but created a corresponding increase in the mean vertical velocity component turbulence. We used vorticity, turbulence intensity, Reynolds stress, and turbulent kinetic energy to characterize the turbulence fields. Of these parameters, only the turbulence intensity is found to be directly related to the shelter efficiency of fences in terms of sediment transport on the surface because the magnitudes of the other parameters nearest the surface are insignificant. Vorticity causes loss of wind energy and tends to lift sediment particles carried by the wind passing over the fences to higher levels. It is found that flow reattachment behind fences is related to the high turbulence intensity nearest to the surface and high Reynolds stress and turbulent kinetic energy in the layer right above. The optimal fence porosity we proposed in a previous study is found to be the critical porosity above which turbulence intensity and vertical velocity component are greatly reduced. Further research is required to make a comprehensive assessment of shelter efficiency of wind fences, taking account of the wind reduction and turbulence fields. (C) 2009 Elsevier Ltd. All rights reserved. |
| 收录类别 | SCI |
| WOS关键词 | WINDBREAKS ACROSS-WIND ; TRIANGULAR PRISM ; VELOCITY ; FLOW ; SHELTER ; EROSION ; DETACHMENT ; PRESSURE ; LAYER |
| WOS研究方向 | Environmental Sciences & Ecology |
| WOS类目 | Ecology ; Environmental Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000273250000005 |
| 出版者 | ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2556296 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Dong, Zhibao |
| 作者单位 | 1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Key Lab Desert & Desertificat, Lanzhou 730000, Gansu, Peoples R China 2.Shaanxi Normal Univ, Dept Geog, Xian, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, Zhibao,Luo, Wanyin,Qian, Guangqiang,et al. A wind tunnel simulation of the turbulence fields behind upright porous wind fences[J]. JOURNAL OF ARID ENVIRONMENTS,2010,74(2):193-207. |
| APA | Dong, Zhibao,Luo, Wanyin,Qian, Guangqiang,Lu, Ping,&Wang, Hongtao.(2010).A wind tunnel simulation of the turbulence fields behind upright porous wind fences.JOURNAL OF ARID ENVIRONMENTS,74(2),193-207. |
| MLA | Dong, Zhibao,et al."A wind tunnel simulation of the turbulence fields behind upright porous wind fences".JOURNAL OF ARID ENVIRONMENTS 74.2(2010):193-207. |
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来源：寒区旱区环境与工程研究所
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