扩散段结构对非对称文丘里施肥器旋涡特征及吸肥性能的影响  

Effects of diffusion section structure on vortex characteristics and fertilizer absorption performance of non-axisymmetric Venturi injector

作　　者：王振华[1,2,3] 胡贵荣 刘宁宁 刘娉楠 曹缘 张栋楠 Wang Zhenhua;Hu Guirong;Liu Ningning;Liu Pingnan;Cao Yuan;Zhang Dongnan(College of Water Conservancy&Architectural Engineering,Shihezi University,Shihezi,832000,China;Key Laboratory of Modern Water-Saving Irrigation of Xinjiang Production&Construction Group,Shihezi,832000,China;Industrial Technology Institute of the Xinjiang Production and Construction Corps,Shihezi,832000,China)

机构地区：[1]石河子大学水利建筑工程学院,石河子832000 [2]现代节水灌溉兵团重点实验室,石河子832000 [3]兵团工业技术研究院,石河子832000

出　　处：《农业工程学报》2022年第16期61-69,共9页Transactions of the Chinese Society of Agricultural Engineering

基　　金：兵团重大科技项目(2021AA003);兵团南疆重点产业创新发展支撑计划项目(202DB004);兵团重点领域创新团队项目(2019CB004);石河子大学创新发展专项(CXFZ201905)。

摘　　要：为减小非对称文丘里施肥器扩散段旋涡区的能量耗散,提升非对称文丘里施肥器在低压灌溉系统中的吸肥性能,该研究通过物理试验与数值仿真,对比分析了直线扩散段与弧形扩散段的非对称文丘里施肥器的工作性能差异。结果表明:将非对称文丘里施肥器扩散段设置成弧形结构有利于减小旋涡区面积及强度,提升非对称文丘里施肥器吸肥性能。与直线扩散段结构相比,弧形扩散段的旋涡区面积减小28.41%~42.37%,旋涡强度减小6.64%~35.65%,吸肥效率提升48.15%~98.25%,提升幅度随进出口压差的增大逐渐减小。旋涡对非对称文丘里施肥器吸肥性能具有显著影响(P≤0.05),减小旋涡区面积或强度、增大旋涡区边界到喉部的距离等均能提升非对称文丘里施肥器吸肥性能。研究结果可为非对称文丘里施肥器的结构设计提供参考。Fertilization equipment is one of the important components of low-pressure irrigation systems.A Venturi injector is widely used in the agricultural irrigation system,due to its simple structure,low price,and convenient use.The non-axisymmetric Venturi injector normally presents a better fertilizer absorption performance than the axisymmetric one.There are many studies on the response relationship between the fertilizer absorption performance and structural parameters of the Venturi injector.But,only a few studies are focused on the response relationship between the vortex characteristics and structural parameters.Therefore,this study aims to explore the influence mechanism of vortex on the non-axisymmetric Venturi injector in the low-pressure irrigation system,in order to improve the fertilizer absorption performance.An analysis was made to compare the vortex characteristics,fertilizer absorption performance,and the response relationship between fertilizer absorption performance and vortex characteristics of non-axisymmetric Venturi injectors with arc diffusion section and non-axisymmetric Venturi injectors with linear diffusion section.A test platform was developed to evaluate the fertilizer absorption performance.The fertilizer inlet of the non-axisymmetric Venturi injector was set as the atmospheric pressure,where the outlet was 0.04 MPa,and the water inlet was controlled between 0.07 and 0.25 MPa.A pressure gradient was taken for each 0.02 MPa to carry out the experimental test of fertilizer absorption performance.At the same time,the computational fluid dynamics software was selected to carry out the vortex analysis and visualization of the flow field.The mathematical modeling,meshing and simulation of Venturi injectors were carried out to compare with the physical test.The Tecplot post-processing software was used to analyze the numerical simulation,where the spline curve was used to locate the vortex.The results show that the diffusion section of the non-axisymmetric Venturi injector as an arc structure wa

关 键 词：CFD 数值分析 文丘里施肥器 扩散段结构 吸肥性能 旋涡 

分 类 号：S224.21[农业科学—农业机械化工程]