方形截面弯管流量计计算模型建立与率定  

Calculation Model Establishment and Calibration of Square Cross Section Elbow Flowmeter

作　　者：刘斌云[1] 赵嘉珩 任仲宇[1] 谭九岑 王炳鑫 LIU Binyun;ZHAO Jiaheng;REN Zhongyu;TAN Jiucen;Wang Bingxin(The College of Architecture and Civil Engineering,Beijing University of Technology,Beijing,100124 China)

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《科技创新导报》2020年第21期53-56,共4页Science and Technology Innovation Herald

基　　金：北京工业大学“星火计划”项目(项目编号:XH-2019-04-23)。

摘　　要：利用量纲分析基本理论建立方形截面弯管流量计的理论计算模型,并对两类测压管方位角23°、45°及弯管曲率半径r分别为40mm、50mm、60mm的六种弯管流量计实验件进行室内过流实验,通过实验确定各种弯管流量计的流量理论计算模型待测系数。同时,通过实验获得了理论模型的计算精度。结果表明,各种管型弯管流量计按所建立的理论计算模型计算出的管内过流量都不同程度的接近于实测流量,而流量模型测算相对误差均值的大小与流量计上所布设测压管的方位角大小及弯管曲率半径的取值大小有关。实验结果分析还表明,曲率与水力半径比值r/R相对较大、方位角相对较小的管型5流量计的设计参数相对最优,其计算误差最小。Based on the basic theory of dimensional analysis,the flow theoretical calculation model of square cross section elbow flowmeter is established,through-flow tests were carried out on six kinds of elbow flowmeter test pieces with azimuth angle 23°,45°and curvature radius r of 40mm,50mm and 60mm,respectively,the measured coefficients of the theoretical calculation models of various elbow flow meters are determined by experiments,meanwhile,the calculation precision of the theoretical model is obtained.The results show that the flow rate calculated by the theoretical calculation model is close to the measured flow rate in different degrees,the mean value of the relative error of the flow model is related to the azimuth angle of the pressure tube and the curvature radius of the tube.The design parameters of tube-type 5 flowmeter with larger r/R ratio and smaller azimuth angle are relatively optimal and its average calculation error is the least.

关 键 词：计量学 方形截面 弯管流量计 流量系数 理论模型 率定 

分 类 号：TB92[一般工业技术—计量学]