气相含量对超声流量计与电磁流量计计量性能的影响研究  

Impact research of gas phase content on the metrological performance ofultrasonic flowmeters and electromagnetic flowmeters

作　　者：裘雪玲 QIU Xueling(Jiangxi General Institute of Testing and Certification,Nanchang 330052,China)

机构地区：[1]江西省检验检测认证总院计量科学研究院,江西南昌330052

出　　处：《工业计量》2024年第3期27-31,共5页Industrial Metrology

摘　　要：生活供排水、农业灌溉、工业生产等领域的管道流量计量,多为大管径电磁流量计或插入式超声波流量计,为保证其量值准确可靠,当前最常用的方法是采用外夹式超声波流量计作为标准表与现场流量计进行比对校准,但现场流体介质并非理想状态,液体中含气对流量计计量的影响不容忽视。为验证气液两相流流态对测量结果的影响,文章设计在实验室质量法流量标准装置上,对不同气液占比条件下的超声波流量计和电磁流量计进行了示值误差测试,并通过计算流体动力学CFD软件模拟标准装置的两相流状态,求取超声波流量计测量断面平均流速,与标准装置数据对比验证CFD计算的正确性,最后提出反诊断方法,以指导现场大管径流量计在线校准。Pipeline flow measurement are mostly large diameter electromagnetic flow meters or plug-in ultrasonic flow meters in the fields of daily water supply and drainage,agricultural irrigation,industrial production,and other fields.To ensure the accuracy and reliability of their measurement values,the most commonly used method currently is to use external clamp ultrasonic flow meters as standard meters for comparison and calibration with on-site flow meters.However,the on-site fluid medium is not ideal,and the impact of gas content in the liquid on flow meter measurement cannot be ignored.To verify the influence of gas-liquid two-phase flow state on measurement results,a laboratory quality method flow standard device is designed to test the indication error of ultrasonic flow meters and electromagnetic flow meters under different gas-liquid ratios.The two-phase flow state of the standard device is simulated using computational fluid dynamics CFD software,and the average flow velocity of the ultrasonic flow meter measurement section is calculated.The correctness of CFD calculation results are verified by comparing with the data of the standard device.Finally,an anti-diagnostic method is proposed to guide the online calibration of large diameter flow meters on-site.

关 键 词：气液两相流 现场校准 超声波流量计 计算流体动力学CFD 自诊断 流速分布 

分 类 号：TH814[机械工程—仪器科学与技术]