Application Research On Pipeline Hydraulic Transportation In Sediment Ejection And Dredging Of Reservoir With Large Bottom Area

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=φ(?)..where φ wasIn the same time, this paper designed and arranged Kezi’er Reservoir using self-pressure pipe desilting system. Through the conclusion calculated with model test and derivation formulas, we can see the superiority of the sediment ejection system. It can timely and correctly provide a foundation for the sediment ejection system to be better applied in engineering practice due to the advantage of efficient, water saving and low energy consumption.