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排灌机械工程学报  2014, Vol. 32 Issue (1): 86-92    DOI: 10.3969/j.issn.1674-8530.13.0212
农业水土工程 最新目录 | 下期目录 | 过刊浏览 | 高级检索 Previous Articles  |   
滴灌灌水器内部水动力学特性测试研究进展
李云开, 冯吉
中国农业大学水利与土木工程学院, 北京 100083
Progress in measurement of hydrodynamic characteristics in drip irrigation emitters
Li Yunkai, Feng Ji
College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China
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摘要 首先总结了灌水器内部3种可视化技术、4种测试模型和示踪粒子,并分析了各技术、模型和粒子的特征和优缺点;在总结前人对灌水器内部水流运动特征测试结果的基础上,提出了一种将灌水器等比例透明平面模型与粒子图像测速(DPIV)技术、平面激光诱导荧光(PLIF)技术相结合的灌水器内部水流运动全场测试方法,利用显微镜物镜改装CCD相机镜头的独特设计,成功实现了滴头流道内全流场无扰测试,并应用该方法实现了不同压力、不同流道类型条件下灌水器流道内部水流运动的测试;在总结前人对灌水器内部颗粒物输移特性测试的基础上,开发了一种将单元段模型、DPIV、PLIF等技术相结合的准三维全场测试方法,通过观测片式灌水器原型及透明模型内部不同粒径颗粒物的运动特征,验证了两者的相似性.利用该方法实现了圆柱形灌水器内部流速分布,并测试了3种典型流道边界优化形式对灌水器流道内颗粒物运动特性的影响.今后,需进一步完善颗粒物运动的DPIV测试,探索灌水器流道内全流场三维测试,开展灌水器内部固-液-气多相耦合流动CFD模拟.
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李云开
冯吉
关键词滴灌灌水器   可视化   水流   颗粒物   流动测试     
Abstract: Firstly, three kinds of visualization techniques, four kinds of test models, and tracer particles were summarized. Then, the characteristics, advantages and disadvantages of those techniques, models and tracer particles were analyzed. Based on experimental results for water flow characteristics in emitters available so far, an experimental method for measuring the whole flow field in an emitter was proposed by integrating a transparent plane model which has the same scale as the real emitter, PIV and planar laser induced fluorescence(PLIF). A series of measurements in water flow characte-ristics in the emitter were realized under various pressures and shapes of flow channel by means of a unique design where a microscope objective lens was refitted into a CCD camera to allow the whole field to be mapped successfully. Based on review of existing experiments on particles transport characteristics in emitters, a quasi-three-dimensional measurement method for the whole field was proposed by integrating unit segment model, PIV and PLIF. Through observing the motion characteristics of particles in the emitters with different diameters, it was confirmed that there is the similarity in the characteristics between the prototype and the transparent model. The velocity distribution in a cylindrical emitter was measured by using this method and the particles transport characteristics in the emitters with three kinds of typical shapes of flow channel are observed. In future, the particle motion observation needs to be improved by using digital particle image velocimetry(DPIV); the three-dimensional measurement of whole field needs to be explored. It is necessary to conduct solid-liquid-gas multiphase flow simulations by using computational fluid dynamics(CFD)approach as well. 
Key wordsdrip irrigation emitter   visualization   flow   particle   flow test   
收稿日期: 2013-10-18;
基金资助:

国家自然科学基金资助项目(50609029);教育部新世纪人才支持计划项目(NETC-10-0780)

通讯作者: 李云开(1975—),男,湖南怀化人,副教授,博士生导师(liyunkai@126.com),主要从事滴灌灌水器设计及堵塞机理与控制研究.   
作者简介: 李云开(1975—),男,湖南怀化人,副教授,博士生导师(liyunkai@126.com),主要从事滴灌灌水器设计及堵塞机理与控制研究.
引用本文:   
李云开,冯吉. 滴灌灌水器内部水动力学特性测试研究进展[J]. 排灌机械工程学报, 2014, 32(1): 86-92.
LI Yun-Kai,FENG Ji. Progress in measurement of hydrodynamic characteristics in drip irrigation emitters[J]. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(1): 86-92.
 
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