水沙非均质流水平管道流动临界速度研究

发布时间：2018-02-03 11:08

本文关键词： 水平管道非均质流堆积界限速度临界速度　出处：《水利水运工程学报》2016年04期 　论文类型：期刊论文

【摘要】：为研究水沙非均质流管道流动的临界速度,在分析前人非均质流管道输沙试验研究成果的基础上,利用数据回归方法建立水沙非均质流管道流动的堆积界限速度计算模型,同时通过分析费祥俊阻力公式,采用求导方式,给出了水沙浆体阻力最小临界速度计算式。然后利用相关学者的若干组数据,对所提出堆积界限速度和阻力最小临界速度的计算值和试验值进行对比。结果表明,作者提出的堆积界限速度和阻力最小临界速度的预测值与实测值的偏差大都不超过15%。最后分析了堆积界限速度和阻力最小临界速度随颗粒粒径、管道直径和浆体输送浓度变化的规律,得出随着颗粒粒径减小,两者差距逐渐变小;随着管道直径变大,两者差距逐渐变大;随着输送浓度变大,堆积界限速度呈略微变小的趋势,而阻力最小临界速度则呈显著增大的趋势。
[Abstract]:In order to study the critical velocity of water and sediment inhomogeneous flow pipeline, based on the analysis of previous experimental results of sediment transport in heterogeneous flow pipeline. Based on the data regression method, a model for calculating the stacking limit velocity of water and sediment non-uniform flow pipeline is established. At the same time, by analyzing the formula of Fei Xiangjun's resistance, the derivation method is adopted. The formula for calculating the minimum critical velocity of the resistance of the water sand slurry is given, and then several sets of data of the relevant scholars are used. The calculated values of the proposed limit velocity and the minimum critical velocity of resistance are compared with the experimental values. The difference between the predicted value of the limit velocity and the minimum critical velocity of resistance and the measured value is less than 15. Finally, the critical velocity of packing and the minimum critical velocity of resistance with particle size are analyzed. The variation of pipeline diameter and slurry transport concentration shows that the difference between them becomes smaller with the decrease of particle size. As the diameter of the pipeline becomes larger, the gap between the two becomes larger. With the increase of transport concentration, the limit velocity of accumulation decreases slightly, while the minimum critical velocity of resistance increases significantly.
【作者单位】：辽宁工程技术大学矿业学院采矿工程系;中煤科工集团武汉设计研究院有限公司管道输煤所;
【基金】：中国煤炭科工集团科技创新基金资助项目(2014QN040)
【分类号】：TV142
【正文快照】： 目前,水库及河流疏浚工程、填海造地工程、尾矿输送工程等都不同程度地涉及到管道输沙技术。利用管道输送泥沙,当输送流速降低到一定程度时,泥沙颗粒就会在管道底部淤积,形成滑动或固定的床层。管道底部有泥沙淤积时,不仅会造成管道磨损、泄露,而且会造成管道堵塞,管路报废。

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