扰流对气体超声波流量计性能的影响  

Influence of Turbulence on Performance of Gas Ultrasonic Flowmeter

作　　者：支洪林 汪涛[1] 康惠海 毛润新 ZHI Honglin;WANG Tao;KANG Huihai;MAO Runxin

机构地区：[1]浙江大学,浙江杭州310000 [2]杭州先锋电子技术股份有限公司,浙江杭州310000

出　　处：《煤气与热力》2025年第3期I0001-I0007,I0015,共8页Gas & Heat

摘　　要：选取规格为50 mm、流量范围为1~160 m^(3)/h的1.0级气体超声波流量计,针对异面双弯管和半月平板两种扰流结构的叠加状态,利用CFD软件对管道内的流场进行数值模拟,探究不同前置管长度、不同入口流量及不同半月平板开口位置对流场对称性的影响,并用实验加以验证。仿真与实验结果表明:在相同前置管长度下,入口流量越大,管道流场的非对称性越明显,流场畸变越严重,相对误差偏移量也越大。在相同入口流量下,随着前置管长度增加,管道截面速度云图上的最大流速位置由管道边缘逐渐回到管道中心,流场逐步接近理想流场。半月平板开口位置不同造成管道流场存在明显差别,不同开口位置的相对误差不同。随着前置管长度逐渐增长至15倍管道内直径以上,半月平板各个开口位置相对误差均呈现出减小趋势,并且趋于稳定。A class 1.0 gas ultrasonic flowmeter with a size of 50 mm and a flow range of 1 to160 m^(3)/h is selected to numerically simulate the flow field in the pipeline by using CFD software in view of the superposition of two types of turbulent flow structures,namely the double bend pipe with different surfaces and the semilunar plate.The influence of different lengths of front tube,different inlet flow rates and different opening positions of semilunar plate on flow field symmetry is investigated and verified by experiments.The simulation and experimental results show that under the same front tube length,the larger the inlet flow,the more obvious the asymmetry of the pipeline flow field,the more serious the flow field distortion,and the larger the relative error offset.Under the same inlet flow,with the increase of the front tube length,the maximum velocity position on the velocity cloud diagram of the pipeline section gradually returns to the center of the pipeline from the edge of the pipeline,and the flow field gradually approaches the ideal flow field.There are obvious differences in the pipeline flow field due to the different opening positions of the semilunar plate,and the relative errors of different opening positions are different.As the length of the front tube gradually increases to more than 15 times the inner diameter of the pipeline,the relative errors of each opening position of the semilunar plate show a decreasing trend and tend to stabilize.

关 键 词：气体超声波流量计 半月平板开口位置 CFD软件数值模拟 

分 类 号：TU996.7[建筑科学—供热、供燃气、通风及空调工程]