基于CFD可调式微滴头流场特性分析  

Analysis of flow field characteristics of adjustable micro-dripper based on CFD

作　　者：侯诗文 张朋杨 李亮[1] 王世锋[1] 朱俊峰[1] HOU Shiwen;ZHANG Pengyang;LI Liang;WANG Shifeng;ZHU Junfeng(Institute of Water Resources for Pastoral Area,Ministry of Water Resources,Hohhot,Inner Mongolia 010020,China;Zhongxi Branch,China Resources Power Investment Co.Ltd.,Zhengzhou,Henan 450000,China)

机构地区：[1]中国水利水电科学研究院牧区水利科学研究所,内蒙古呼和浩特010020 [2]华润电力投资有限公司中西分公司,河南郑州450000

出　　处：《排灌机械工程学报》2020年第8期855-860,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：政府间国际科技创新合作重点专项资助(2016YFE0102400);中国水科院基本科研业务费专项资助项目(MK2016J22,MK2016J21,MK2017J03)。

摘　　要：为了提高中国北方干旱缺水地区灌溉效率,设计一种机械可调式微滴头.为了探究不同工况下微滴头内部流场分布特性,采用CFD方法并选择标准k-ε模型对滴头内部流场进行仿真计算,分析了装配长度分别为1.5,3.0,4.5 mm,入口边界条件分别为10,30,50 kPa的滴头内部流场分布特性和滴头出入口流体物理参数变化特征.研究结果表明:随着装配长度的增加,微滴头内部消能室的空间体积逐渐减小,“死流区”空间比例逐渐减小,滴头内部杂质积累率降低;随着入口压力值的增大,流道内部流速值也不断增大,出口流体活跃性也逐渐增强.Aiming at the problem of irrigation efficiency in north arid and dry areas of China,a kind of mechanically adjustable micro-dripper was designed.In order to explore the distribution characteristics of flow field inside micro-dripper under different working conditions,the CFD method was used and the standard k-ε model was chosen to simulate the interior flow of the micro-dripper.The internal flow field distribution characteristics of the micro-dripper with inlet lengths of 1.5 mm,3.0 mm and 4.5 mm,and inlet boundary conditions of 10 kPa,30 kPa and 50 kPa,respectively,were analyzed.The results show that the space volume of the internal energy-dissipating chamber of the micro-dripper gradually decreases with the increase of the mating length,the proportion of space in the"dead-flow zone"gradually decreases,the impurity accumulation rate inside the emitter drops.With the increase of inlet pressure,the internal flow velocity of the channel also increases continuously,and the activity of the outlet fluid also gradually increases.

关 键 词：微滴头 可调式 结构优化 流场特性 灌溉效率 

分 类 号：S275.6[农业科学—农业水土工程] TV131.2[农业科学—农业工程]