| 湍流中泥沙垂线分布的力学解释 |
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| 引用本文： | 夏建新,吉祖稳. 湍流中泥沙垂线分布的力学解释[J]. 水利学报, 2003, 34(1): 0045-0050 |
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| 作者姓名： | 夏建新 吉祖稳 |
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| 作者单位： | 1. 北京大学,环境工程系水沙科学教育部重点实验室,北京,100871
2. 中国水利水电科学研究院,泥沙所,北京,100044 |
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| 基金项目： | 国家自然科学基金项目 (4 962 5 10 1) |
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| 摘 要： | 作者从泥沙垂向动量交换出发，分析了泥沙在紊流中由于湍流脉动产生的升力效应，并综合考察了非湍流脉动原因存在的升力以及在不同浓度下含沙水流中泥沙受到的有效重力，得到了基于力学角度的泥沙浓度垂线分布的关系式。在此基础上，通过对床面粗糙度、泥沙粒径和含沙量等影响泥沙浓度垂线分布有关因素的分析，探讨了挟沙水流中两种不同浓度分布类型产生以及转化的原因，并结合具体的试验资料对泥沙浓度垂线分布形态时行了计算和验证，取得了较好的结果。
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| 关 键 词： | 紊流；泥沙；浓度垂线分布；升力效应 |
| 文章编号： | 0559-9350(2003)01-0045-06 |
| 修稿时间： | 2001-10-16 |
Mechanical interpret for vertical sediment concentration distribution in turbulent flow |
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| XIA Jian-xin,JI Zu-wen. Mechanical interpret for vertical sediment concentration distribution in turbulent flow[J]. Journal of Hydraulic Engineering, 2003, 34(1): 0045-0050 |
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| Authors: | XIA Jian-xin JI Zu-wen |
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| Affiliation: | 1.The Key Lab. of Water and Sediment Sciences of Ministry of Education; Department for Environmental Engineering, Peking University; 2. China Institute of Water Resources and Hydropower Research |
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| Abstract: | The authors derived a mechanical relation of the vertical sediment concentration distribution by analyzing the lift effect caused by the vertical momentum balance of sediments in turbulent flow, the lift forces acting on the sediment due to non-turbulent reasons (Magnus force and Saffman force) and the effective gravitation in sediment-laden flow. Accordingly, two different patterns of concentration distribution were discussed considering the major factors, such as bed roughness, sediment size and solid concentration. The concentration distribution was verified by using experimental data. A good agreement between measured data and calculated results was obtained. |
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| Keywords: | turbulent flow sediment vertical profile of concentration lift effect. |
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