| 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 |
| 湍流中泥沙垂线分布的力学解释 |
| Mechanical interpret for vertical sediment concentration distribution in turbulent flow |
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| DOI： |
| 中文关键词: 紊流 泥沙 浓度垂线分布 升力效应 |
| 英文关键词: turbulent flow sediment vertical profile of concentration lift effect. |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| 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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