某弹簧式灌水器流道的三维UDF动网格数值模拟
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摘要
灌水器是决定微灌系统节水效果的关键部件,而优化灌水器内部结构并获得相关水力学参数成为解决灌水器优劣的主要问题,目前对灌水器的数值计算大多属于静态模拟,存在一定的局限性,为了完善新型灌水器流道内部结构,以某弹簧式灌水器为研究对象,前期进行物理模型试验测得相关参数,后期主要采用动态网格及UDF(用户自定义函数)技术,对其内部流道进行了三维动态数值模拟计算,得到了该灌水器的水头损失、上下游压差力与流量之间的关系,将数模结果与物理试验值进行对比分析后的结果表明,动态网格结合UDF的方法能够较好地模拟具有动态边界的微灌流道。
Emitter is the key part influencing the water saving effect of micro-irrigation system. The main problem of emitter is to optimize the internal structure and obtain relevant hydraulic parameters. Nowadays the numerical calculation of the emitter is mostly static simulation with some kind of boundedness. In order to improve the internal structure of the new emitter flow channel,taking one spring-loaded emitter as an object,the previous study was carried on the physical model test and relevant parameters were obtained. And then based on dynamic mesh and UDF( User-Defined Function) technology,numerical simulation for its internal flow channel was carried out,from which the flow,head loss and the relationship between the upstream and downstream pressure differential force were derived. By the contrast of numerical simulation result and physical experiment value,it is found that the combination of dynamic mesh and UDF can simulate micro-irrigation channel with dynamical boundary well.
Emitter is the key part influencing the water saving effect of micro-irrigation system. The main problem of emitter is to optimize the internal structure and obtain relevant hydraulic parameters. Nowadays the numerical calculation of the emitter is mostly static simulation with some kind of boundedness. In order to improve the internal structure of the new emitter flow channel,taking one spring-loaded emitter as an object,the previous study was carried on the physical model test and relevant parameters were obtained. And then based on dynamic mesh and UDF( User-Defined Function) technology,numerical simulation for its internal flow channel was carried out,from which the flow,head loss and the relationship between the upstream and downstream pressure differential force were derived. By the contrast of numerical simulation result and physical experiment value,it is found that the combination of dynamic mesh and UDF can simulate micro-irrigation channel with dynamical boundary well.
引文
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[2]罗良国,仁爱胜,王瑞梅.中国农业可持续发展的水危机及广泛开展节水农业前景初探[J].节水灌溉,2000(5):6-10.LUO L G,REN A S,WANG R M.An Elementary Study on Water Resource Crisis and Agricultural WS Foreground for Agriculture Sustainable Development in China[J].Water Saving Irrigation,2000(5):6-10.
[3]朱献文.滴灌系统毛管流量调节器研制与开发[D].陕西:西北农林科技大学水建学院,2004:5-7.
[4]聂磊,史玉升,魏青松,等.基于灌水器流量的湍流模型适应性研究[J].节水灌溉,2008(1):13-17.NIE L,SHI Y S,WEI Q S,et al.Research on Adaptability of Different Turbulent Models Based on Flow Discharge of the Drip Emitters[J].Water Saving Irrigation,2008(1):13-17.
[5]王周奇.浅谈双支管滴灌系统在果棉间作套种中的应用[J].南水北调与水利科技,2013(2):125-127.WANG Z Q.Application of Two-branch-pipe Drip Irrigation System in Fruit-Cotton Intercropping[J].South-to-North Water Transfers and Water Science&Technology,2013(2):125-127.
[6]金文,张鸿雁,何文博.灌水器流道结构对水利性能影响的数值分析[J].中国农业大学学报,2012(17):139-143.JIN W,ZHANG H Y,HE W B.Numerical Investigation on effect of Channel Structure to Hydraulic Performance of Emitter[J].Journal of China Agricultural University,2012(17):139-143.
[7]田济扬,白丹,于福亮,等.基于FLUENT软件的滴灌双向流流道灌水器水力性能数值模拟[J].农业工程学报,2014,30(20):65-71.TIAN J Y,BAI D,YU F L,et al.Numerical Simulation of Hydraulic Performance on Bidirectional Flowchannel of Drip Irrigation Emitter Using Fluent[J].Transactions of the Chinese Society of Agricultural Engineering,2014,30(20):65-71.
[8]聂境,赵涛.齿形迷宫流道流场数值模拟与优化[J].节水灌溉,2011(7):40-42.NIE J,ZHAO T.Numerical Simulation and Optimization of Tooth Shape Labyrinth Flow Channel[J].Water Saving Irrigation,2011(7):40-42.
[9]于勇,张俊明,姜连田.FLUENT入门与进阶教程[M].北京:北京理工大学出版社,2008:2.
[10]孟桂祥,张鸣远,赵万华.滴灌滴头内流场的数值模拟及流道优化设计[J].西安交通大学学报,2004(9):921-924.MENG G X,ZHANG M Y,ZHAO W H.Numerical Flow Simulation and Optimum Channel Design of Drip Irrigation Emitter[J].Journal of Xi'an Jiaotong University,2004(9):921-924.
[11]李鹏飞,徐敏义,王飞飞.精通CFD工程仿真与案例实战[M].北京;人民邮电出版社,2011.
[12]朱红钧,林元华,谢龙汉.FLUENT流体分析及仿真实用教程[M].北京:人民邮电出版社,2010:2-3.
[13]李进良,李承曦,胡仁喜,等.精通FLUENT6.3流场分析[M].北京:化学工业出版社,2010:2-3.
[14]江帆,黄鹏.FLUENT高级应用与实例分析[M].北京:清华大学出版社,2008.
[15]张凯,王瑞金,王刚.Fluent技术基础与应用实例[M].北京:清华大学出版社,2010:2-3.
[16]韩占忠,王敬,兰小平.FLUENT流体工程仿真计算实例与应用[M].北京:北京理工大学出版社,2004:19-20.