微灌用网式过滤器数值模拟与结构优化  

Numerical simulation and structural optimization of screen filter in micro-irrigation

作　　者：王新坤[1] 高世凯[1] 夏立平[1] 许鹏[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013

出　　处：《排灌机械工程学报》2013年第8期719-723,共5页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家863计划项目(2011AA100506);农业科技成果转化资金资助项目(2011GB2C100015)

摘　　要：针对微灌用网式过滤器研究主要集中在水力性能试验研究方面,以进口直径为50 mm的阿速德(AZUD)普通微灌网式过滤器为研究对象,利用Pro/E软件完成过滤器的三维造型,基于计算流体动力学软件Fluent 6.3,采用多孔介质模型对过滤器内部流场进行数值模拟,得到了过滤器内部的速度分布和水力特性.为了增强数值模拟的可靠性,将模拟计算结果与试验结果对比,最大偏差和平均偏差分别为7.4%和4.1%,具有较好的吻合性,证实了数值模拟的可行性,可用于微灌网式过滤器的结构优化.在保证滤网面积与进口直径不变的前提下,优化过滤器筒体形状、进出口位置和进出口角度,改善过滤器内部流场分布,提高速度分布的均衡性和均匀性,延长滤网使用寿命.优化模拟结果表明水头损失降低69%,滤网过滤面上下两侧最大平均速度差由1.0 m/s减小为0.1 m/s.The research of micro-irrigation screen filter was mainly concentrated in hydraulic perfor-mance test.Computational fluid dynamics software Fluent 6.3 was adopted to simulate the flow and ana-lyze the hydraulic performance of a 2 inches AZUD micro-irrigation screen filter.The screen was predigested as a porous media,and the models were built by 3D software Pro/E.Results show that the si-mulated results and experiment results agree well with each other.The maximum relative deviation was 8%,and averaged relative deviation was 4.4%.The filter internal flow distribution,the balance of screen velocity distribution and the filter life have been improved by optimizing inlet and outlet location,inlet and outlet angle and filter shapes under the same filter area and inlet diameter.Optimization results show that the head loss is reduced by 69% and the maximum speed difference between both sides on screen filter surface is decreased from 1.0 m/s to 0.1 m/s.

关 键 词：网式过滤器 多孔介质 水头损失 数值模拟 结构优化 

分 类 号：S277.9[农业科学—农业水土工程]