摘要
为了提高灌区的测流精度,降低测流的成本和人力投入,以伯努利方程为测流原理,制作了一种压力式明渠测流装置。基于Fluent软件,利用VOF方法和Realizable k-ε模型对压力式明渠测流装置在矩形渠道中的水力特性进行数值计算,得到的数据在后处理软件中进行处理、分析,同时进行试验验证。研究表明:渠道水流自由液面横向流速从中心到渠道两侧边壁逐渐减小,中心断面垂向流速从渠道底部到自由液面先增大后减小,且最大流速点位于自由液面以下;渠道水流在压力式明渠测流装置下游区形成涡旋;模拟得到的不同位置处流速与试验流速最大误差不超过4.08,最小仅为0.29;在矩形渠道中,压力式明渠测流装置的模拟流量值与实际流量值误差小于3,可以满足测流精度的要求,证明了数值模拟的可行性。
In order to improve the accuracy of flow measurement in the irrigation area,reduce the cost and manpower investment,the pressure-type detection device for open channel was developed,which was based on Bernoulli equation.Based on Fluent software,the hydraulic characteristics of pressure-type detection device for open channel flow were numerically simulated with the VOF method and Realizable k-εmodel.The data were analyzed in the post-processing software and verified with the experimental data.The results showed that the transverse velocity of the free surface decreased from the center to both sides of the channel,and the vertical velocity of the central section increased first and then decreased from the bottom of the channel to the free surface,and the maximum velocity point was below the free surface;The flow formed a vortex in the downstream area of the pressure-type detection device for open channel flow.The maximum error between the simulated velocity and the experimental velocity was not more than 4.08%,and the minimum error was only 0.29%;The error between the simulated flow and the actual flow of the pressure-type detection device for open channel flow in the rectangular channel was no more than 3%,which could meet the requirements of flow measurement accuracy and proves the feasibility of numerical simulation.
作者
钟凯月
周义仁
ZHONG Kai-yue;ZHOU Yi-ren(College of Water Conservancy Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China)
出处
《节水灌溉》
北大核心
2020年第12期6-9,16,共5页
Water Saving Irrigation
基金
山西省重点研发计划项目(201803D221028-3)。
关键词
明渠测流
数值模拟
压力式
传感器
测流精度
open channel flow measurement
numerical simulation
pressure-type
sensor
flow measurement accuracy
作者简介
钟凯月(1996-),男,硕士研究生,研究方向为水利信息化。E-mail:1098857246@qq.com;通讯作者:周义仁(1969-),男,教授,主要从事新型传感器及水利信息化研究工作。E-mail:46571938@qq.com。
