U型液氢科里奥利质量流量计理论与数值分析  

Theoretical and Numerical Analysis of U-Tube Coriolis Mass Flowmeter with Liquid Hydrogen

作　　者：裴祥翔 陈强峰 宋玉彩 张小斌[1] Pei Xiangxiang;Chen Qiangfeng;Song Yucai;Zhang Xiaobin(Institute of Refrigeration and Cryogenics,Zhejiang University,Hangzhou 310027,China;Zhejiang Zheneng Fuxing Fuel Co.,Ltd.,Hangzhou 310003,China)

机构地区：[1]浙江大学制冷与低温研究所,杭州310027 [2]浙江浙能富兴燃料有限公司,杭州310003

出　　处：《天津大学学报（自然科学与工程技术版）》2024年第9期992-1000,共9页Journal of Tianjin University：Science and Technology

基　　金：国家重点研发计划资助项目(2022YFB4002900);浙江省重点研发计划资助项目(2021C01099).

摘　　要：科里奥利质量流量计(简称科氏流量计)因其精度高、结构简单且流阻小的优点广泛用于流体测量.本文基于计算流体动力学和结构动力学相耦合的数值算法,探究了用于液氢测量的U型科氏流量计流固耦合振动特性.首先搭建水流量标定实验平台对建立的流致振动理论模型和流固耦合数值仿真框架进行结果验证,实验中的标准流量基于称量法获得,科氏流量计测量管两臂的相位差基于自行设计研制的控制电路进行采集计算.验证结果表明,建立的流固耦合仿真框架(偏差为-2.51%)相比于采用欧拉梁理论建立的理论模型(偏差为-12.89%)具有更好的预测性能.基于验证的数值框架和理论模型对单U型液氢科氏流量计质量流量和测量管壁上传感器位置对测量时滞及测量振幅的影响规律进行分析揭示,并对比分析水和液氢两种工质对科氏流量计模态特性的影响.结果表明,流体的附加质量对测量管模态特性影响显著,由于液氢的低密度特性,采用结构的干模态频率进行激振仍可以获得较高的激振效率,其测量管振幅约为水工质对应测量管振幅的17.75倍.而液氢的低密度及低温特性则显著降低其时滞,对于液氢质量流量的高精度测量是不利的.理论和数值结果的对比表明,传感器位置对测量时滞的影响也会受流体质量流量的影响.结果对液氢科氏流量计的优化设计有指导意义.Owing to its high accuracy,simple structure,and small flow resistance,the Coriolis mass flowmeter(CMF)is widely used in fluid measurement.In this study,the fluid-structure interaction vibration characteristics of a U-tube CMF with liquid hydrogen were investigated based on the coupling of computational fluid and computational structural dynamics and a flow-induced vibration model was established.The developed model and fluid-structure interaction framework were first validated based on a test rig for water.The standard mass flow rate in the experiment was obtained using a weighing method,and the phase difference between the two arms of the measuring tube was calculated using a designed control circuit.The comparison results revealed that the numerical simulation has a better prediction performance than the theoretical calculation based on the Euler beam model,in which the deviation of the numerical and theoretical results is-2.51%and-12.89%,respectively.Based on the verified numerical and Euler beam models,the influences of the mass flow rate and sensor positions on the time lag and vibration amplitude of a single U-tube CMF with liquid hydrogen were revealed.In addition,the effects of water and liquid hydrogen on the modal characteristics of the measuring tube were compared.Results showed that the additional mass of the fluid con2024 siderably influenced the modal characteristics of the measuring tube.Owing to the low density of liquid hydrogen,driving the tube with a dry mode frequency could achieve high driving efficiency,and the vibration amplitude of the measuring tube was about 17.75 times that of using water as the working fluid.However,the low-density and cryogenic characteristics of liquid hydrogen reduced the time lag,which was unfavorable for the high-precision measurement of the mass flow rate.In addition,the comparison of the theoretical and numerical results revealed that the effect of sensor position on time lag was affected by the mass flow rate.The findings of this study provide significant guida

关 键 词：科里奥利质量流量计 液氢 流固耦合特性 数值仿真 

分 类 号：TH814[机械工程—仪器科学与技术]