| 滴头流道内部含沙水流流动特征的试验研究 |
| |
| 引用本文： | 闫大壮,杨培岭,赵 桥.滴头流道内部含沙水流流动特征的试验研究[J].农业工程学报,2008,24(2):52-56. |
| |
| 作者姓名： | 闫大壮 杨培岭 赵 桥 |
| |
| 作者单位： | 中国农业大学水利与土木工程学院,北京,100083 |
| |
| 基金项目： | 国家自然科学基金
,
中国农业大学校科研和教改项目 |
| |
| 摘 要： | 滴头流道中水流的运动状况是影响滴头水力性能的主要因素,而水源中悬浮颗粒(沙粒)的存在对于水流有着不可忽略的反作用.该文研究了浑水(含沙水流)在迷宫滴头流道内流动过程,分别选用清水和含沙浓度为40、80、160 mg/L,的浑水,通过滴头在不同压力下流量变化,分析了流道内部含沙水流流动特征及沙粒对滴头水力性能的影响.试验结果表明:同一工作压力下,沙粒的制紊效应使得滴头流量随悬浮颗粒浓度的加大先上升后下降;滴头的流态指数随悬浮颗粒浓度的提高略呈下降趋势;在该试验条件下,流道内层流向湍流过渡早于常规流动,工作压力在45 kPa时流道内水流已处于湍流状态.
|
| 关 键 词： | 迷宫滴头 含沙水流 临界雷诺数 摩阻系数 |
| 文章编号： | 1002-6819(2008)-2-0052-05 |
| 收稿时间： | 2006/12/30 0:00:00 |
| 修稿时间： | 2006年12月30 |
Experimental study on suspensions flow hydraulic characteristics in dripper emitter path |
| |
| Yan Dazhuang,Yang Peiling and Zhao Qiao.Experimental study on suspensions flow hydraulic characteristics in dripper emitter path[J].Transactions of the Chinese Society of Agricultural Engineering,2008,24(2):52-56. |
| |
| Authors: | Yan Dazhuang Yang Peiling and Zhao Qiao |
| |
| Institution: | College of Water Conservancy and Civil Engineering,China Agricultural University,Beijing 100083,China,College of Water Conservancy and Civil Engineering,China Agricultural University,Beijing 100083,China and College of Water Conservancy and Civil Engineering,China Agricultural University,Beijing 100083,China |
| |
| Abstract: | The hydraulic property of emitters is primarily influenced by the flow movement of emitter path. The reaction of the suspend particles to the flow is intense and should not be ignored. The flow process of flow with sand particles in labyrinth emitter path was studied. The mass fractions of sand particles in the experiment were 40, 80, 160 mg/L, respectively. The flow rates were measured both cleaning water and flow with sand particles. Effects of flow friction characteristics and sand particle on the hydraulic property of emitters were analyzed. Results indicate that the emitter discharge decreases slightly and the emitter flow rates show a trend from rising to declining with the increasing of the suspension concentration in the same operating pressure because of the turbulence prevention by sands. The transition from laminar flow to turbulent flow in emitter path happened earlier than that in normal sized tube. The critical pressure is about 45 kPa. |
| |
| Keywords: | labyrinth emitter sediment flow critical Reynolds Number friction factors |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《农业工程学报》浏览原始摘要信息 |
| 点击此处可从《农业工程学报》下载免费的PDF全文 |
|
