Abstract:In order to improve the hydraulic performance of three-way pulse jet tee, effects of nozzle width of jet tee were simulated based on single phase fluid flow models and CFD method by employing 6 kinds of widths for the nozzle. Their influences on the frequency, amplitude and hydraulic perfor-mance of the jet tees were analyzed. The jet tees with 3, 4, 5 mm widths were manufactured and tested with water. The relationships between irrigation uniformity and pulse frequency, flow deviation rate and outlet flow rate were determined by a 70m long drip irrigation tape, the experimental comparison was made under the same conditions with an ordinary tee. The results show that the three-way pulse jet tee with 4 mm width is subject to a larger amplitude, higher frequency and better stability than the other tees. The uniformity of the jet with a width of 4mm is the best in experiments as well, especially the average uniformity is as good as 94.88%, which is 0.65% higher than the ordinary tee. With the increase of pressure head, the uniformity of irrigation is reduced, but it is still better than the ordinary tee, particularly, the difference between them is getting bigger and bigger. These results provide a theore-tical basis for three-way pulse jet tee structures and dropper anti-clogging systems.
樊二东, 王新坤, 肖思强, 徐胜荣, 王轩, 张晨曦, 薛子龙. 基于喷嘴宽度对射流三通水力性能试验与模拟[J]. 排灌机械工程学报, 2018, 36(9): 835-839.
FAN Erdong, WANG Xinkun, Xiao Siqiang, XU Shengrong, WANG Xuan, ZHANG Chenxi, XUE Zilong. Experiment and simulation of hydraulic performance of three-way pulse jet tee with various nozzle widths. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(9): 835-839.
[1]金宏智,严海军,王永辉.喷灌技术与设备在中国的适应性分析[J].农业工程,2011,4(1):42-45. JIN Hongzhi,YAN Haijun,WANG Yonghui.Adaptability analysis of sprinkler irrigation technology and equipments in China[J].Agricultural engineering,2011,4(1):42-45.(in Chinese)[2]袁寿其,李红,王新坤. 中国节水灌溉装备发展现状、问题、趋势与建议[J]. 排灌机械工程学报, 2015, 33(1): 78-92. YUAN Shouqi,LI Hong,WANG Xinkun. Status, problems, trends and suggestions for water-saving irrigation equipment in China[J]. Journal of drainage and irrigation machinery engineering, 2015, 33(1): 78-92.(in Chinese)[3]魏正英,苑伟静,周兴,等.我国压力补偿灌水器的研究进展[J].农业机械学报,2014,45(1):94-101. WEI Zhengying,YUAN Weijing,ZHOU Xing,et al.Research progress of pressure compensating emitters in micro-irrigation systems in China[J].Transactions of the CSAM,2014,45(1):94-101.(in Chinese)[4]王聪, 芦刚, 刘洁,等. 波动水压滴灌系统设计与实验分析[J]. 中国农村水利水电, 2012(6):69-72. WANG Cong, LU Gang, LIU Jie,et al. Design of dynamic pressure drip irrigation system and experimental analysis[J]. China rural water and hydropower, 2012(6):69-72.(in Chinese))[5]王新坤.一种射流三通,CN103203293A[P].2013-07-17.[6]杨玉超.射流脉冲三通振荡特性影响因素研究[D].镇江:江苏大学,2016.[7]辛利. 音波振荡器振荡性研究及应用[D].大连:大连理工大学,2010.