风沙流中沙粒浓度分布的实验研究

doi:10.11867/j.issn.1001-8166.2004.05.0732

地球科学进展 ›› 2004, Vol. 19 ›› Issue (5): 732 -735. doi: 10.11867/j.issn.1001-8166.2004.05.0732

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

收稿日期:2003-06-30 修回日期:2003-10-15 出版日期:2004-12-20
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
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

A STUDY OF THE PARTICLE CONCENTRATION IN THE SAND FLUX—A WIND TUNNEL INVESTIGATION

WANG Hong-tao ¹, DONG Zhi-bao ¹, ZHANG Xiao-hang ²

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

Received:2003-06-30 Revised:2003-10-15 Online:2004-12-20 Published:2004-10-01

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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

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

中图分类号:

P425.2

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[1]	屈建军;黄宁;拓万全;雷加强;董治宝;刘贤万;薛娴;俎瑞平;张克存. 戈壁风沙流结构特性及其意义[J]. 地球科学进展, 2005, 20(1): 19-023.

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