滴头流道结构对悬浮颗粒分布影响的数值分析  

Numerical analysis of influence of emitter channel structure on suspended granule distribution

作　　者：王文娥[1] 王福军[2] 牛文全[1] 胡笑涛[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,杨凌712100 [2]中国农业大学水利与土木工程学院,北京100083

出　　处：《农业工程学报》2009年第5期1-6,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：“863”计划节水农业重点课题(2006AA100208);国家教育部博士点基金新教师项目(200807121008);陕西省自然科学基金(SJ08E225);西北农林科技大学科研启动经费资助项目

摘　　要：迷宫滴头内部结构复杂尺寸微小,研究流道结构对悬浮颗粒浓度分布的影响对于流道优化有重要意义。该文采用正交试验方法设计齿形流道,根据两相流理论,利用计算流体动力学软件对设计滴头进行了液固两相流数值分析。模拟得到入流浓度及颗粒大小不同时滴头内的速度及颗粒浓度分布,分析了结构参数、颗粒大小及入流浓度对悬浮颗粒浓度分布的影响。研究结果表明:流道结构参数对颗粒分布均有影响,程度从大到小顺序为:齿角度-齿间距-流道深度-齿高;入流颗粒大小为流道最小尺寸的1/10～1/6时滴头不易堵塞;齿高与齿间距的比值小于0.5时有利于提高滴头的抗堵塞性。研究为滴头结构优化提供参考。The size of labyrinth emitter is minimal and the internal structure is relatively complex. It is necessary to analyze the influence of emitter channel structure on the suspended granule distribution for emitter channel structural optimization. The orthogonal design was used for emitter channel design. Based on two-phase flow theory, numerical analysis of liquid solid two-phase flow of design emitter was carried out using computational fluid dynamics software. The velocity and suspended granule distribution in the emitter channel at different inlet concentrations and granule sizes were obtained by simulation. The effects of structure parameters, granule sizes and inlet concentrations on suspended granule distribution were analyzed. The results showed that the emitter channel structure had influence on granule concentration distribution. The order of influence degree was tooth angle, intertooth space, channel depth, and tooth depth. The chance of emitter being plugged by granule particles was small if the granule size was 1/10th- 1/6th of the least size of the channel width, and it was advantaged to improve the anti-clogging ability of emitters if the ratio of tooth depth and intertooth space was less than 0.5. The study can provide reference for emitter structure optimization.

关 键 词：计算流体动力学 滴头流道结构 固液两相流 

分 类 号：S275[农业科学—农业水土工程]