摘要
为了探究插入式灌水器的水力特性,为其结构优化提供理论指导,通过室内出流试验,研究了灌水器间距S、供水压力H对插入式灌水器灌水均匀度和出流量的影响。结果表明,在间距20~60 cm、压力6~16 m条件下,插入式灌水器的灌水均匀度均大于80,灌溉效果满足滴灌工程技术规范的要求;灌水均匀度随供水压力的增大略有提高,但提高幅度较小,因此通过增大供水压力来提高灌水均匀度的做法是不经济的;随着灌水器间距的增大,支管敷设长度增加,管路水流沿程水头损失增大,灌水均匀度逐渐下降;在供水压力6~16 m范围内,插入式灌水器的出流量和供水压力关系符合qk Hx,当灌水器间隔S20~60 cm时,流量系数k0.394~0.429,流态指数x0.671~0.711,流态指数均大于0.5,灌水器属非压力补偿器。
In order to explore the hydraulic characteristics of a new type insertion subsurface emitter and provide theoretical guidance for their structural optimization,this paper studied the influence of emitter spacing and water supply pressure on the irrigation uniformity and discharge of insertion subsurface emitters through indoor outflow test.The results show that under the conditions of irrigation spacing 20~60 cm and pressure of 6~16 m,the irrigation uniformity of the irrigation emitters are more than 80%,and the irrigation effect can meet the requirements of the Technical standard of drip irrigation project;The irrigation uniformity slightly increases with the increase of the water supply pressure,but the increase range is small,therefore it is not economical to increase the irrigation uniformity by increasing the water supply pressure;As the emitter spacing increases,the length of the branch pipe increases,the friction head loss increases as well,so irrigation uniformity gradually decreases;Within the range of 6~16 m of water supply pressure,the relationship between the drip flow and water supply pressure of the emitter conformes to the function of qk Hx;when the irrigation spacing is at the range of 20 to 60 cm,the range of flow coefficient is 0.394~0.429,the range of flow index is 0.671~0.711,and the flow index is greater than 0.5.So the insertion subsurface emitter is a non-pressure compensator.
作者
马丽
孙西欢
马娟娟
郭向红
郑利剑
MA Li;SUN Xi-huan;MA Juan-juan;GUO Xiang-hong;ZHENG Li-jian(College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan, 030024,China;Jinzhong University, Jinzhong,030619, Shanxi, China)
出处
《节水灌溉》
北大核心
2020年第4期11-16,20,共7页
Water Saving Irrigation
基金
国家自然科学基金资助项目(U1803112)。
关键词
插入式灌水器
灌水均匀度
灌水器间距
压力流量关系
insertion subsurface emitter
irrigation uniformity
emitter spacing
flow pressure-discharge curve
