管道水力输送在大库盘水库排沙清淤中的应用研究-水利水电工程专业论文.docxVIP

Ⅱ Ⅱ 管道水力输送在大库盘水库排沙清淤中的应用研究 摘 要 针对大库盘水库库面宽阔且横向泥沙淤积严重的问题，设计和布置了自吸式管道排 沙系统，该系统是利用水库水位差将库内泥沙排出库外的一种新型排沙减淤措施。通过 对单根管道和自吸式管道排沙系统的模型试验研究，分析了管道出口流速与水位差、流 速与含沙量的关系，并确定了水位差与管道流速成正比、含沙量与管道流速成反比的关 系，以及管道内部淤积情况。本文在单根管道模型试验的基础上进行了数值模拟研究。 数值模拟采用目前国际上通用的FLUENT软件进行数值计算。通过数值计算和模型试验 的结果对比确定了数值计算的可行性和可靠性。数值模拟重点探讨了管道出口流速与管 道含沙量、水位差、泥沙粒径、管道长度和管道内径的关系。并采用量纲分析得出了 v ??? 2gH ，式中： 1C0 ( 1 C0 ( L )?0.26 ?（ D )0.519 ?（?12.53 d ??0.226）??( Sv )?0.2 ??( ?r )?0.345 2 H H H ? ?g 。 同时，本文对克孜尔水库进行了自吸式管道排沙系统的布置和设计。通过物理模 型试验和推导公式计算的结果可以看出管道排沙系统的优越性，高效、节水、耗能低 的优点也为管道排沙系统能较好地应用于工程实践提供了前期研究基础。 关键词：大库盘水库；排沙清淤；管道水力输送；自吸式管道；物理模型试验；FLUENT； 固液两相流；量纲分析；克孜尔水库 Ⅲ Ⅲ Application Research on Pipeline Hydraulic Transportation in Sediment Ejection and Dredging of Reservoir with Large Bottom Area Abstract In order to solve the problems of Large Bottom Area Reservoir which has broad surface and serious reservoir sedimentation, we designed and arranged a new kind of measure for desilting that use the difference in hydrostatic head to expel sediment from inside reservoir to outside which we can call it “the self-pressure pipe desilting system”. This paper analyzes not only relationship between the Flow Velocity of Pipeline Outlet and Water-head and between Sediment Concentration and Flow Velocity by using the model test and numerical simulation, but also makes the conclusion that Water-head is proportional to Flow Velocity of Pipeline, Sediment Concentration is inversely proportional to the Flow Velocity and the Sedimentation in pipe. By using one pipe model test and FLUENT numerical simulation which used internationally, we can see the feasibility and reliability of the results. This paper mainly discussions the relationship between the Flow Velocity of Pipeline Outlet and Sediment Concentration, Water-head, Sediment Grain Size, Pipe Length, Diameter. This paper use dimensional analysis and make conclusion: v ??? 2gH .where ? was 1  L ?0.26  D 0.519 d  Sv ?0.2 2 C0 ( H ) ?（ ) H ?（??12.53 ??0.226）??( ) . H