高频脉冲条件下灌水器水沙两相流数值模拟  

Numerical Simulation of Water-Sediment Two-phase Flow in Emitter under High Frequency Pulse

作　　者：王新坤[1] 靳彬彬 樊二东 张经坤 王琪雯 丁师伟 WANG Xinkun;JIN Binbin;FAN Erdong;ZHANG Jingkun;WANG Qiwen;DING Shiwei(Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang 212013,China;Inner Mongolia Chuole Water Conservancy and Hydropower Co.,Ltd.,Huhhot 010090,China;Water Affairs Bureau of Huhhot City,Inner Mongolia Autonomous Region,Huhhot 010016,China;Shandong Taishan Pumped Storage Power Station Co.,Ltd.,Taian 271000,China)

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,镇江212013 [2]内蒙古绰勒水利水电有限责任公司,呼和浩特010090 [3]内蒙古自治区呼和浩特市水务局,呼和浩特010016 [4]山东泰山抽水蓄能电站有限责任公司,泰安271000

出　　处：《农业机械学报》2020年第2期277-283,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(51579116);江苏省科技计划项目(BE2018373)

摘　　要：为提高灌水器的抗堵塞性能,在与射流三通产生波形相同参数(周期、振幅)的高频脉冲波(正弦波、三角波、梯形波、矩形波)的条件下,以迷宫流道灌水器为研究对象,应用CFD两相流含沙量数值分析,采用k-ε湍流模型及多相流Eulerian模型,模拟高频脉冲条件下流量与压力水头关系、含沙量的瞬时分布,分析高频脉冲条件对颗粒物沉积区含沙量变化的影响。结果表明,高频脉冲波对灌水器平均流量和抗堵塞性能影响较大,高频脉冲波的波动性和连续性对提高灌水器抗堵塞能力起主要作用;抗堵塞能力由大到小的高频脉冲波形顺序为正弦波、三角波、梯形波、矩形波;入流含沙量增加会导致旋涡区泥沙的沉积,高频脉冲波可以增强旋涡区的冲刷以提高抗堵塞性能;灌水器内各处含沙量均随颗粒粒径的增大而升高,不同粒径下含沙量分布和变化略有不同。射流三通产生的脉冲波有利于提高灌水器的抗堵塞能力。Emitter clogging is one of the obstacles that limits the application and popularization of drip irrigation technology.The computational fluid dynamic(CFD)method was regarded as the most effective method to research the water and sand movement in the labyrinth path of the drip irrigation emitter.Based on the high-frequency pulse with the same parameters(period and amplitude),and the jet tee was used as the boundary condition,and CFD software was used to simulate two-phase flow sand concentration in labyrinth channel irrigator in order to improve emitter anti-clogging performance.The k-ε turbulence model and Eulerian multiphase flow model were used to simulate the relationship between flow rate and pressure,the instantaneous distribution of particulate matter concentration under high frequency pulse condition,and the influence of high frequency pulse condition on the variation of particulate matter concentration in sediment area.The results showed that the high frequency pulse wave had a great influence on the average flow rate and anti-clogging performance of the emitter,and the fluctuation and continuity of the high frequency pulse wave played a major role in the anti-clogging ability of the emitter;the order of the high frequency pulse wave of anti-clogging ability in descending order was sinusoidal wave,triangular wave,trapezoidal wave and rectangular wave;increasing inflow concentration would lead to sediment deposition in the vortices,and high frequency pulse wave can increase the erosion of the vortices to improve the blockage resistance.The concentration of each part of the emitter was increased with the increase of particle size,and the concentration distribution and variation were slightly different under different particle sizes.The research result can provide theoretical reference for the application and popularization of the drip irrigation system with high frequency pulsed flow.

关 键 词：灌水器 射流三通 高频脉冲波 含沙量 颗粒粒径 抗堵塞 

分 类 号：S275.6[农业科学—农业水土工程]