| 摘要: |
| 近30年来，固体物料的管道水力输送技术应用越来越广泛。在管道水力输送系统设计中，不淤临界流速是首先需要确定的重要参数，对确保管道安全输送具有重要意义。对于细颗粒物料，已有比较成熟的计算方法，但对粗颗粒物料，不同的计算式差异较大，给参数确定带来困难。在对已有的管道不淤临界流速计算进行比较分析基础上，探讨了颗粒浓度、粒径、密度以及管道直径等因素对不淤临界流速的影响，并分析了计算式结构的差异。整理不同学者针对粗颗粒输送的试验数据，重点分析了不淤临界流速随颗粒粒径加大的变化规律。基于量纲分析法，提出了粗颗粒在管道输送中不淤临界流速计算式，其计算结果与试验数据相对误差在10%以下，基本满足不淤临界流速计算的工程要求。 |
| 关键词: 粗颗粒物料 管道 水力输送 不淤临界流速 |
| DOI： |
| 分类号:TD522 |
| 基金项目:国家自然科学基金资助项目（51179213, 51339008, 51434002） |
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| Non-silting critical velocity calculation of coarse-grained materials in hydraulic pipeline |
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QIU Hao, CAO Bin, XIA Jian-xin
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College of Life and Environment Science， Minzu University of China， Beijing
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| Abstract: |
| In the past 30 years,pipeline hydraulic transportation of the solid materials has been applied much more wildly. In the design of the pipeline hydraulic transportation system, the non-silting critical velocity is an important parameter needed to be ascertained at first, which has a great significance for the system operation safety. For the fine-grained materials in the pipeline hydraulic transportation system, many calculation methods can be applied for this parameter. However, for the coarse-grained materials, how to choose the calculation formulas is a difficult problem because of their great different results. In this paper, based on the comparison and analysis of the existing non-silting critical velocity calculation formulas, the influences of the factors including particle concentration, size distribution, density and diameter of the pipeline, on the non-silting critical velocity are discussed especially for the coarse-grained materials, the structure differences of the formulas are compared. A careful analysis of variation law of the non-silting critical velocity changed with the increase of particle size is made by sorting out the experimental data of the coarse-grained materials transport given by different scholars. And based on a dimensional analysis, a new formula to calculate the non-silting critical velocity in a horizontal pipeline hydraulic transportation system has been suggested. The relative errors between the calculated results and the tested data are less than 10%, which can basically meet engineering requirements of calculation of the non-silting critical velocity. |
| Key words: coarse particle pipeline hydraulic transportation non silting critical velocity |
