| 范家骅,祁伟,戴清.异重流潜入现象探讨Ⅰ:水槽实验与理论分析成果回顾[J].水利学报,2018,49(4):404-418 |
| 异重流潜入现象探讨Ⅰ:水槽实验与理论分析成果回顾 |
| Investigation of density current plunging Ⅰ: Review of previous flume experiment works and theoretical analysis |
| 投稿时间：2017-07-03 |
| DOI：10.13243/j.cnki.slxb.20170641 |
| 中文关键词: 异重流 异重流潜入 水槽实验 理论分析 |
| 英文关键词: density current density current plunging flume experiment theoretical analysis |
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| 摘要点击次数: 2941 |
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| 中文摘要: |
| 本文对异重流潜入现象中各种潜入点水槽实验、理论分析和数值计算成果进行回顾，并探讨不同进口水沙条件下异重流潜入点的水沙特性、潜入点与其下游异重流水沙因子的关系，全文以两篇分述。本篇介绍各家用浑水、盐水和冷水进行实验，在已知进口水沙（盐水或冷水）条件下，获得潜入点断面的密度Froude数Fp，且Fp为某一定值；水库壅水区Fp值在0.5~0.8之间，引航道口门处Fp在0.25左右。在潜入点理论分析、模型数值计算方面，探讨了潜入点Fp值同掺混系数、阻力系数以及潜入点下游异重流深度hd与潜入点水深Fp之比的关系；各家建立不同概化图形并应用能量、动量方程进行分析，求得不同形式的Fp表达式；有学者利用紊流水沙模型进行数值计算与水槽实验的Fp值或hp进行对比，获得基本符合实际的结果。 |
| 英文摘要: |
| This paper reviews previous flume experiment works and theoretical analysis of density current plunging,then explores the value of the densimetric Froude number Fp at the plunge point and the relationship of the value of Fp with the depth of the density current hd. The paper contains two parts. Here the first part presents a review of experiments of plunge point with turbid,saline or cold water inflow. Experimental value of Fp=0.5~0.8 in reservoir backwater region, and Fp=0.1~0.3 in navigation guiding channels were obtained by many researchers. Then a summary was made for the previous theoretical analysis and the numerical analysis of turbulent flow models for plunge point prediction. Various authors investigated the parameter Fp which varies with the mixing coefficient, friction coefficient and the ratio of the density current depth hd downstream of the plunge point to the plunge point depth hd. Several schematic diagrams were developed,and analyses were made applying energy equation and momentum equation,and obtained some different types of Fp expressions. Some investigators used the method of turbulent models with numerical calculation to determine the value of hp or Fp. Comparison was made with the experiment values of hp or Fp. The previous theoretical analysis results of density current plunge point were used to compare with the writer's investigation results by theoretical analysis. |
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