回流滴灌系统毛管泥沙输移规律模拟及实验研究  

Simulation and experimental study on lateral sediment transport in drip irrigation with return pipe

作　　者：卢金锁[1,2] 路泽星 于健 史吉刚 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]西北水资源与环境生态教育部重点实验室,陕西西安710055 [3]内蒙古自治区水利科学研究院,内蒙古呼和浩特010020

出　　处：《干旱地区农业研究》2017年第2期176-181,共6页Agricultural Research in the Arid Areas

基　　金：内蒙古自治区重大水利科技专项(2014-117)

摘　　要：为探究回流滴灌系统滴灌毛管的输沙潜力和抗堵塞性能,本试验通过CFD模拟和室内滴灌实验探究滴灌系统中泥沙颗粒输移规律和水流运动特性。CFD模拟结果表明:当毛管内水流流速小于0.2 m·s^(-1)时,随流速的增加,自毛管进入滴头的泥沙数量明显减少,且毛管内水流紊流强度大小与紊流区域范围逐渐减小;当毛管内水流流速大于0.2 m·s^(-1)时,流速的增加对进入滴头内的颗粒数量和水流状态无明显影响。室内滴灌实验结果表明:回流滴灌系统毛管水流流速增加时,滴头出水中的泥沙颗粒数量较支状系统减少约30%,而当回流毛管流速为0.1 m·s^(-1),三种滴灌带的灌水周期比支状滴灌系统分别提高50%、38%、41%,继续提高流速对提高灌水周期影响不大。回流滴灌系统较传统滴灌系统可以显著提高毛管的输沙排沙能力,减少进入滴头内的泥沙数量,提高系统抗堵塞性能,延长滴灌系统的运行周期。In order to explore the sediment transport potentials of lateral in drip irrigation system with return pipe,this paper utilized the numerical method by CFD and intermittent drip irrigation method to study the movement regulation of sand particles and movement state of liquid-solid two-phase flow in lateral. The result showed that with the increase of flow velocity in lateral,the number of particles enter into emitter reduced significantly;when the flow rate is 0. 05 ~ 0. 2 m·s^(-1),the turbulence intensity and turbulence region in the lateral were reduced with the increase of flow velocity. When the flow rate is 0. 2 ~ 0. 4 m·s^(-1),the increase of flow rate has no obvious effect on the change of water flow state. When the return pipe is arranged at the end of lateral to increase flow velocity,the number of particles outflow from emitter is reduced by about 30%. When the flow rate of return pipe is0. 1 m·s^(-1),the irrigation period of three kinds of emitter was improved by 50%,38% and 41% respectively.These results indicate that to improve the flow rate of lateral can significantly improve the transport capacity of sand,increase the running time of drip irrigation system,reduce the requirements for water treatment facilities.

关 键 词：泥沙输移 滴头堵塞 CFD模拟 回流管 毛管流速 

分 类 号：S275.6[农业科学—农业水土工程]