| 风沙流中沙粒拖曳力系数研究 |
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| 引用本文： | 曹晞雍,谢莉.风沙流中沙粒拖曳力系数研究[J].中国沙漠,2011,30(3):593-596. |
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| 作者姓名： | 曹晞雍 谢莉 |
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| 作者单位： | 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 |
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| 基金项目： | 国家重点基础研究发展规划项目(2009CB421304)资助 |
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| 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。
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| 关 键 词： | 风沙流 拖曳力系数 椭圆形沙粒 |
| 收稿时间： | 2010-12-1 |
| 修稿时间： | 2011-2-25 |
A Study on the Drag Coefficient of Sand Particles in Wind Sand Flux |
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| CAO Xi-yong
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XIE Li.A Study on the Drag Coefficient of Sand Particles in Wind Sand Flux[J].Journal of Desert Research,2011,30(3):593-596. |
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| Authors: | CAO Xi-yong XIE Li |
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| Institution: | CAO Xi-yong,XIE Li(Key Laboratory of Ministry of Education for Mechanics on Western Disaster and Environment,School of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China) |
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| 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 calculate... |
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| Keywords: | wind sand flux drag coefficient elliptical |
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