作者：陈利琼1, 谢虹雅1, 孙靖云1, 刘琦1, 陶宏伟2
作者单位：1. 西南石油大学石油与天然气工程学院, 四川 成都 610500;
2. 中国石油与天然气股份公司西南管道分公司, 四川 成都 610094
关键词：CFD;超声流量计;安装位置;优化
摘要：
在实际生产中，由于现场扰流元件的作用，计量管内会出现不同程度的流速畸变，使超声流量计的工作性能降低。因此，采用CFD数值模拟方法针对超声流量计（以DANIEL 3400超声流量计为例）上游存在不同布置形式的弯头扰流元件时，保证其计量准确性的最近安装位置进行研究，获得DANIEL 3400型超声流量计的推荐安装位置，为体积计量的准确实施提供参考。结果表明，当弯头扰流元件的形式相同且入口流速不变时，计量管内径越大，计量误差越小，即超声流量计对于雷诺数Re较大的气体具有更好的测量性能；弯头弯曲角度越大、曲率半径越小，气流扰动越强。基于模拟结果，获得不同情况下超声流量计的推荐安装位置，并提出在弯头后安装板式流动调整器以减少气流扰动，为体积计量的准确实施提供参考。
Research on the measurement accuracy of gas ultrasonic flowmeter based on CFD
CHEN Liqiong1, XIE Hongya1, SUN Jingyun1, LIU Qi1, TAO Hongwei2
1. Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, China;
2. Southwest Pipeline Branch of CNPC, Chengdu 610094, China
Abstract: In actual production, due to the action of the on-site spoiler components, different degrees of flow velocity distortion will occur in the metering tube, which will reduce the performance of the ultrasonic flowmeter. Therefore, using the CFD numerical simulation method for the ultrasonic flowmeter (take the DANIEL 3400 ultrasonic flowmeter as an example), there are different arrangements of the elbow spoiler components upstream, and the nearest installation position to ensure the accuracy of the measurement is studied. The recommended installation position of the DANIEL 3400 ultrasonic flowmeter provides a reference for the accurate implementation of volumetric measurement. The results show that the larger the inner diameter of the metering tube, the metering error is smaller when the shape of the elbow spoiler and the inlet flow rate constant remain the same. It indicates that the ultrasonic flowmeter performs better on gases with Reynolds number. And it is found that the larger the bend angle of the elbow and the smaller the radius of curvature, the perturbation of the gas flow velocity is stronger. According to the simulating results, the installation location of the ultrasonic flowmeter is obtained and it is recommended to install a plate flow regulator downstream of the elbow to reduce flow disturbance. This study can provide reference for accurate volumetric measurement.
Keywords: CFD;ultrasonic flowmeter;installation location;optimization
2019, 45(7):87-91 收稿日期: 2018-05-10;收到修改稿日期: 2018-06-20
基金项目: 2016国家重点研发计划（2016YFC0802100）
作者简介: 陈利琼(1976-),女,四川成都市人,教授,博士,主要从事油气储运安全技术、油气储运系统优化技术方面的研究
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