长流道式直线型沉沙池结构优化与数值模拟  

Structural Optimization and Numerical Simulation of Long-channel Linear Sedimentation Basin

作　　者：胡松可 李文昊[1,2] 杨广[1,2] 刘宁宁 金瑾[1,2] HU Song-ke;LI Wen-hao;YANG Guang;LIU Ning-ning;JIN Jin(College of Water Conservancy and Engineering,Shihezi University, Shihezi 832000, China;Key Laboratory of Modern Water Saving Irrigation Corps,Shihezi University, Shihezi 832000, China)

机构地区：[1]石河子大学水利建筑工程学院,新疆石河子832000 [2]石河子大学现代节水灌溉兵团重点实验室,新疆石河子832000

出　　处：《长江科学院院报》2021年第6期67-71,共5页Journal of Changjiang River Scientific Research Institute

基　　金：国家重点研发计划课题(2017YFC0403205)。

摘　　要：沉沙池是保障滴灌系统正常运行的重要设施之一,但灌溉期池内水沙“固液”耦合过程比较复杂,且难以通过单一物理模型进行结构优化。为进一步提高滴灌系统沉沙效率,设计了长流道直线型沉沙池;采用物理试验与数值模拟相结合的方式,研究有无调流板和不同调流板角度对池内水沙运动规律的影响。结果表明:Fluent软件可准确模拟池内“固液”耦合过程;后池设计的调流板起到了消能、降速和提高沉沙率的作用;相较于无调流板,有调流板时后池流速可降低70%以上,沉沙率提高12%以上;且60°倾角调流板池内流速最低,沉沙率最高,出口含沙量最低为1.12 g/L,沉沙率平均可达到71.26%。研究可为优化水工结构、提高沉沙池工作效率提供一定的技术支撑。Desilting basin is one of the important facilities to ensure the normal operation of drip irrigation system.However,the solid-liquid coupling process of water and sediment in the basin during irrigation is complex,and it is difficult to optimize the structure by a single physical model.In order to boost the deposit efficiency of drip irrigation system,we designed a long channel straight-line desilting basin.Through physical experiment and numerical simulation,we examined the influences of flow-adjusting board and the angle of the flow-adjusting board on flow and sediment movement.Results manifest that the solid-liquid coupling process in the basin can be simulated accurately by Fluent software;the flow-adjusting board designed in the back basin plays the role of energy dissipation,speed reduction and improvement of sediment settling rate by reducing the flow velocity by above 70%and enhancing the sediment setting rate by over 12%compared with that in the absence of flow-adjusting board.In addition,when the inclined angle of flow-adjusting board is 60°,the flow velocity in the basin drooped to the lowest,while sedimentation rate hit the highest;the minimum sediment concentration at the outlet was 1.12 g/L,and the sedimentation rate averaged at 71.26%.The research findings offer technical support for optimizing hydraulic structure and improving the efficiency of desilting basin.

关 键 词：沉沙池 泥沙特性 数值模拟 调流板 沉沙率 

分 类 号：TV15[水利工程—水力学及河流动力学]