基于CFD灌溉机井管道液相流场的数值模拟  

Numerical simulation of irrigation well pipeline liquid flow based on CFD

作　　者：王萍[1,2] 杨超 WANG Ping;YANG Chao(School of Electrical Engineering and Automation,Tianjin Polytechnic University,Tianjin 300387,China;Key Laboratory of Advanced Electrical Engineering and Energy Technology,Tianjin Polytechnic University,Tianjin 300387,China)

机构地区：[1]天津工业大学电气工程与自动化学院,天津300387 [2]天津工业大学电工电能新技术天津市重点实验室,天津300387

出　　处：《天津工业大学学报》2018年第1期68-73,共6页Journal of Tiangong University

基　　金：国家自然科学基金资助面上项目(61372011);国家高技术研究发展计划(863计划)资助项目(2014AA093403)

摘　　要：为改善农用灌溉时差法超声波流量计的测量精确度,利用Fluent软件中的标准k-ε模型对灌溉机井管道液相流场进行三维数值模拟,观察机井管道水平轴截面和竖直轴截面的压力云图以及速度分布图,分析管道内流体的速度分布特性,并在此基础上提出平均流速修正公式,对其进行实验验证.结果表明:受弯管二次流影响,出水管流场紊乱,各截面速度分布差异明显,降低了流量计测量精确度.经修正后流量计测量精确度提升了4.9%.To improve the accuracy of the Jet lag ultrasonic flowmeter for the agricultural irrigation,the continuous flow field within pipeline of irrigation well is simulated with the standard k-εmodel in Fluent software,the pressure nephogram and the velocity distribution in horizontal and vertical cross-section are observed to analyze the characteristic of fluid velocity distribution in pipeline.The average velocity correction formula of the pipeline is established and proved by the experiment.The results show that the pipe flow field is disturbed by the secondary flow of elbow,the velocity distribution of each section is obviously different and the measuring accuracy of the meter is reduced.After velocity correction,the measurement accuracy of the meter increases by 4.9%.

关 键 词：CFD数值模拟 灌溉机井管道 弯管二次流 液体流场 标准k-ε模型 流速修正 

分 类 号：TB937[一般工业技术—计量学]