支管射流三通结构优化与试验  

Structure optimization and test of three-way pulse jet tee

作　　者：薛子龙 王新坤[1] 樊二东 徐胜荣 王轩 张晨曦 XUE Zilong;WANG Xinkun;FAN Erdong;XU Shengrong;WANG Xuan;ZHANG Chenxi(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,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,江苏镇江212013

出　　处：《排灌机械工程学报》2020年第7期751-756,共6页Journal of Drainage and Irrigation Machinery Engineering

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

摘　　要：为了提高支管射流三通水力性能,改善滴灌的灌水均匀性,基于CFX数值模拟技术,对进口宽度为15 mm的支管射流三通进行结构优化.选取位差、劈距、劈尖半径和侧壁倾角为影响因素,通过四因素三水平正交设计了9组模型,边界条件设定为进口压力100 kPa.选取支管射流三通出口设计流量为评价标准,支管射流三通最优结构尺寸为位差5.5 mm、劈距113 mm、劈尖半径13 mm、侧壁倾角10°.此结构尺寸参数下的支管射流三通水力性能试验结果表明:在进口水压为100 kPa时,支管射流三通脉冲频率为148次/min,水头压力振幅为37.9 k Pa,水头压力损失为16.7 kPa,出口流量为0.698 L/s;支管射流三通所接滴灌带长度为60 m时,与普通支管三通相比,支管射流三通的灌水均匀系数提高了2.78%,流量偏差率降低了4.72%.该研究可为射流技术在脉冲滴灌系统的研究、开发与应用提供理论依据.In order to improve the hydraulic performance of three-way pulse jet tee and the uniformity of drip irrigation,the structure of a three-way pulse jet tee with 15 mm inlet width was optimized based on CFX numerical simulation technology.The half difference in width between nozzle and tee inlet s,distance between tee inlet and daughter branch inlet H,daughter branch wall curvature radius r and tee inlet wall inclination angleβwere selected as influencing factors,then nine cases were generated by using four-factor and three-level orthogonal design table.A 100 kPa inlet pressure was used as the boundary condition and the flow rate through the daughter branches was served as the evaluation criterion.The optimum structural dimensions of the three-way pulse jet tee are s=5.5 mm,H=113 mm,r=13 mm andβ=10°.A hydraulic performance test was conducted on this optimized three-way pulse jet tee.When the inlet water pressure is 100 kPa,the pulse frequency of the jet in the tee is 148 min-1,the hydraulic head amplitude is 37.9 kPa,the hydraulic head loss is 16.7 kPa,and the outlet flow rate is 0.698 L/s.When the tee is connected with a 60 m long drip irrigation tape,the uniformity coefficient of irrigation is improved by 2.78%and the flow rate deviation is lowered by 4.72%in comparison with the ordinary three-way tee.This study can provide a theoretical basis for research,development and application of the pulse jet drip irrigation system.

关 键 词：支管射流三通 正交设计 水力性能 流量偏差率 灌水均匀系数 

分 类 号：S275.6[农业科学—农业水土工程]