| 悬移质颗粒运动的脉动强度 |
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| 引用本文： | 李丹勋,王兴奎,禹明忠. 悬移质颗粒运动的脉动强度[J]. 水科学进展, 2002, 13(2): 146-152 |
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| 作者姓名： | 李丹勋 王兴奎 禹明忠 |
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| 作者单位： | 清华大学水沙科学教育部重点实验室, 北京, 100084 |
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| 基金项目： | 国家自然科学基金资助项目(59479012, 50009003) |
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| 摘 要： | 应用图象处理技术,量测了直径d=0.1～1.5mm的塑料颗粒和d=0.1～0.3mm的玻璃球颗粒在明槽恒定均匀水流中运动的脉动强度.试验发现:(1)靠近床面处,粗颗粒的脉动强度大于细颗粒的脉动强度,在靠近水面处,规律则相反;(2)细颗粒的脉动强度只是相对水深y/h的函数,而粒径较大颗粒的脉动强度和y/h及摩阻流速都有关;(3)重颗粒的脉动强度小于相同粒径的轻质颗粒的脉动强度.
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| 关 键 词： | 悬移质 图象处理 脉动强度 |
| 文章编号： | 1001-6791(2002)02-0146-07 |
| 收稿时间： | 2000-12-11 |
| 修稿时间： | 2000-12-11 |
Experimental study on velocity fluctuations of suspended particles |
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| LI Dan-xun,WANG Xing-kui,YU Ming-zhong. Experimental study on velocity fluctuations of suspended particles[J]. Advances in Water Science, 2002, 13(2): 146-152 |
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| Authors: | LI Dan-xun WANG Xing-kui YU Ming-zhong |
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| Affiliation: | Key Laboratory for Water and Sediment Sciences, Tsinghua University, Beijing 100084, China |
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| Abstract: | The image processing technique was applied to measure velocity fluctuations of suspended parti cles in open channel flows. Two kinds of spherical particles were studied:plastic particles(d=0.1~1.5 mm)and glass particles(d=0.1~0.3 mm)Experimental results reveal that:(1)coarse particles pos sess greater velocity fluctuations than fine particles in the near bed region,while the scenario is completely opposite in the upper flow;(2)the velocity fluctuation of fine particles is a function of y/h,and for coarse particles,the velocity fluctuat ions relate not only to y/h but also to the shear stress;and(3)the plastic particles have greater velocity fluctuations than glass particles of the same size. |
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| Keywords: | suspended particle image processing velocity fluctuation |
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