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地球科学进展  2004, Vol. 19 Issue (5): 732-735    DOI: 10.11867/j.issn.1001-8166.2004.05.0732
研究论文     
风沙流中沙粒浓度分布的实验研究
王洪涛1;董治宝1;张晓航2
中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室,甘肃 兰州 730000 ;清华大学工程力学系湍流实验室,北京 100080
A STUDY OF THE PARTICLE CONCENTRATION IN THE SAND FLUX—A WIND TUNNEL INVESTIGATION
WANG Hong-tao1, DONG Zhi-bao1, ZHANG Xiao-hang2
1.Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sinences, Lanzhou 730000,China; 2.Laboratory of Turbulance, Mechanics Department, Tsinghua University, Beingjing 100080,China
 全文: PDF(76 KB)  
摘要:

利用粒子图像测速技术(PIV),在风洞内对与天然沙接近的石英沙风沙流沙颗粒浓度沿高度分布进行了研究。对 3种不同轴线风速研究结果表明,风沙流中沙粒浓度沿水平方向基本不变,而随高度呈指数衰减,而且其衰减速率与风速密切相关。风速越大,衰减速率越慢;风速越小,衰减速率越快。风沙运动一旦发生时,靠近沙床表面的沙粒浓度随风速变化很小,可以认为趋于稳定,达到最大值。

关键词: 体积浓度风沙流粒子图像测速相对浓度    
Abstract:

Particle Image Volocimetry(PIV) technology was used to study the particle concentration through the wind tunnel experiment. To get the better results, we used the artificial quartz sand instead of the natural sand. The particle concentrations at three wind velocities were detected by the state of the art measurement. The results show that the concentration of the particles in the sand flux has little change with the horizontal direction, and decreases quickly with height, which can be expressed by an exponential function  . The decay rate of the particle concentration has a close relationship with the wind velocity. It increases with the decreasing wind velocity and decreases with the increasing wind velocity. When the sands movement starts, the concentration very close to the sand surface is changeless with the wind velocity. 

Key words: Particle Image Volocimetry    Relative concentration    Volume concentration.    Sand flux
收稿日期: 2003-06-30 出版日期: 2004-10-01
:  P425.2     
基金资助:

国家杰出青年科学基金项目“风沙边界层动力学研究”(编号:40225003);中国科学院寒区旱区环境与工程研究所创新项目“玛多县现代沙漠化过程”(编号:2003110)资助

通讯作者: 王洪涛(1975-),男,山东威海人,博士研究生,主要从事风沙物理与风沙工程研究.     E-mail: E-mail: desertsnake@sina.com
作者简介: 王洪涛(1975-),男,山东威海人,博士研究生,主要从事风沙物理与风沙工程研究.E-mail: desertsnake@sina.com
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引用本文:

王洪涛;董治宝;张晓航. 风沙流中沙粒浓度分布的实验研究[J]. 地球科学进展, 2004, 19(5): 732-735.

WANG Hong-tao1, DONG Zhi-bao1, ZHANG Xiao-hang2. A STUDY OF THE PARTICLE CONCENTRATION IN THE SAND FLUX—A WIND TUNNEL INVESTIGATION. Advances in Earth Science, 2004, 19(5): 732-735.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2004.05.0732        http://www.adearth.ac.cn/CN/Y2004/V19/I5/732

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