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中国沙漠 ›› 2011, Vol. 31 ›› Issue (3): 593-596.

• 国家重点基础研究发展规划 • 上一篇    下一篇

风沙流中沙粒拖曳力系数研究

曹晞雍, 谢 莉*   

  1. 兰州大学 西部环境教育部重点实验室/土木工程与力学学院, 甘肃 兰州 730000
  • 收稿日期:2010-12-01 修回日期:2011-02-25 出版日期:2011-05-20 发布日期:2011-05-20

A Study on the Drag Coefficient of Sand Particles in Wind Sand Flux

CAO Xi-yong, XIE Li   

  1. Key Laboratory of Ministry of Education for Mechanics on Western Disaster and Environment; School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China
  • Received:2010-12-01 Revised:2011-02-25 Online:2011-05-20 Published:2011-05-20

摘要: 拖曳力系数是计算风沙流中沙粒受空气阻力的重要参数。考虑实际风沙流中沙粒浓度及沙粒形状,利用FLUENT软件首先计算了不同风速下距地表不同高度处两沙粒的拖曳力系数,给出了影响沙粒拖曳力系数的间距范围,然后计算了真实风沙流中不同高度沙粒拖曳力系数。结果表明,给定风速下拖曳力系数随距地面高度的增加先减小后增加,并将沙粒拖曳力系数拟合成距床面高度的函数,该函数与风速有关。

关键词: 风沙流, 拖曳力系数, 椭圆形沙粒

Abstract: Drag coefficient is an important parameter for calculating the air resistance acting on sand particles in the wind sand flux. In this paper, taking sand concentration and sand shape in the actual situation into account, the drag coefficients of two sand particles that are at different heights from the surface are calculated using FLUENT software. Influence of wind velocity and interval between sand particles on the drag coefficient is discussed. Then the drag coefficients at different heights have been calculated in actual wind sand flux. The result indicates that at a certain wind velocity, with the increase of height from the surface, the drag coefficient first decreases and then increases. Lastly, a formula of drag coefficient is fitted, which is a function of height and relates to wind velocity.

Key words: wind sand flux, drag coefficient, elliptical

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