多声道超声波流量计弯管段安装的适应性研究  

Adaptability study of multi-channel ultrasonic flowmeter installed in bend pipe section

作　　者：王维路 杨鸣[1] Wang WeiLu;Yang Ming(Ningbo University,College of Information Science and Engineering,Zhejiang Ningbo 315211,China)

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211

出　　处：《现代科学仪器》2018年第4期20-24,共5页Modern Scientific Instruments

摘　　要：为了针对在不满足直管段安装条件时,如何合理选取多声道超声波流量计的安装角度。文章提出了一种计算面平均流速的新的算法,采用计算流体力学(CFD)方法,从数学建模、数值计算仿真和试验分析等方面,对DN50交叉多声道超声波流量计在弯管中的适应性进行了研究。仿真结果表明:在弯管下游,不同位置处加入蜂窝整流器,随着直管段距离的增加,多声道超声波流量计的相对误差逐渐减小;安装角度对误差的影响不明显,没有规律;固定安装角度的情况下,低流速(1、2m/s),在1D^2D处时的误差比较大,不符合精度要求。随着直管段长度和初始流速的增加,误差有明显的下降,在3D^5D处时,均符合精度要求。In order to reasonably select the installation angle of the multi-channel ultrasonic flowmeter when the installation condition of the straight pipe section is not satisfied.In this paper,a new algorithm for calculating the average flow velocity of a surface is proposed.The computational fluid dynamics(CFD)method is used to simulate the DN50 cross-multichannel ultrasonic flowmeter in the elbow from mathematical modeling,numerical simulation and experimental analysis.The adaptability was studied.The simulation results show that the honeycomb rectifier is added at different positions downstream of the elbow.As the distance of the straight pipe increases,the relative error of the multi-channel ultrasonic flowmeter gradually decreases.The installation angle has no obvious influence on the error,and there is no regularity.In the case of the installation angle,the low flow rate(1,2 m/s)has a large error at 1D to 2D and does not meet the accuracy requirements.As the length of the straight pipe section and the initial flow velocity increase,the error decreases significantly,and the accuracy requirements are met at 3D to 5D.

关 键 词：超声波流量计 多声道 蜂窝整流器 声道安装角度 CFD 

分 类 号：TH814[机械工程—仪器科学与技术]