摘要
针对液氢质量流量的准确测量需求,基于COMSOL Multiphysics平台建立了Ⅱ型管科氏流量计的有限元数值模型。以水为工质进行数值仿真,通过与理论结果对比验证了模型的可靠性;以液氢为工质,系统地研究了Ⅱ型管科氏流量计的测量特性,分析了激振频率、检振器位置、激振器长度对相位差及振幅的影响,探讨了温度变化对测量相位差的影响规律;研究结果表明:1)激振频率方面,采用湿模态频率作为激振频率可获得更大的振幅,有利于信号采集和处理,同时温度变化会通过影响测量管材料特性改变固有频率,因此需相应地调整激振频率;2)检振器位置对相位差影响显著,远离固定端时相位差逐渐减小,对于Ⅱ型管模型应选择弯管与进出口直管段交界处作为检振器安装位置,该位置不仅具备较高的检测灵敏度,还能够为检振器提供具有更高振幅的信号;3)激振器长度对流量系数的影响较小,但与振动幅值正相关,较长的激振器可获得更高振幅的信号,需结合实际结构需求权衡设计;4)温度变化会引起测量管和液氢物性参数的改变,其中液氢密度对相位差的影响最为显著,测量管弹性参数也对相位差有一定影响,而测量管密度和流体黏度的影响可忽略;研究成果可为液氢科氏流量计的结构优化、测量精度提升提供理论和模型基础。
To meet the demand for accurate measurement of liquid hydrogen mass flow,a finite element numerical model of a Ⅱ-shaped Coriolis flowmeter was established using the COMSOL Multiphysics platform.Numerical simulations were conducted with water as the working fluid,and the reliability of the model was verified by comparing the simulation results with theoretical predictions.Liquid hydrogen was used as the working fluid to systematically investigate the measurement characteristics of the Ⅱ-shaped Coriolis flowmeter.The effects of excitation frequency,detectorposition,and exciter length on phase difference and amplitude were analyzed,and the influence of temperature variations on the measured phase difference was also explored.Theresults show that:1)regarding excitation frequency,using the wet modal frequency as the excitation frequency yields larger amplitudes,which are beneficial for signal acquisition and processing;temperature changes affect the natural frequency by altering the material properties of the measurement tube,thus requiring corresponding adjustments to the excitation frequency;2)the detector position significantly influences the phase difference—the phase difference gradually decreases as the detector moves away from the fixed end;for theΠ-shaped tube model,the optimal detector location is at the junction between the bend and the straight inlet/outlet sections,where high detection sensitivity and stronger signals can be achieved;3)the impact of exciter length on the flow coefficient is minimal,but it is positively correlated with vibration amplitude;longer exciters produce higher amplitude signals,though practical structural requirements must be considered in the design;4)temperature variations alter both the physical properties of the measuring tube and those of liquid hydrogen;the density of liquid hydrogen has the most significant effect on the phase difference,while the elastic parameters of the measuring tube also play a role;the density of the measuring tube and the viscosity of the fluid have negligible impacts.The findings of this study provide a theoretical and modeling foundation for optimizing the structure and improving the measurement accuracy of Coriolis flowmeters for liquid hydrogen.
作者
王家强
邢兰昌
陈家辉
左艳彤
邵红
WANG Jiaqiang;XING Lanchang;CHEN Jiahui;ZUO Yantong;SHAO Hong(College of Control Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China;Shandong Provincial Engineering Research Center of Intelligent Sensing and Measurement and Control Technology,Qingdao 266580,China;Qingdao Campus of Naval Aeronautical University,Qingdao 266041,China)
出处
《计算机测量与控制》
2025年第12期74-81,88,共9页
Computer Measurement & Control
基金
新型油气勘探开发国家科技重大专项(2024ZD140660408)
国家自然科学基金项目(42574162)
山东省自然科学基金项目(ZR2024ME090)。
关键词
科氏流量计
液氢
有限元模拟
流固耦合
测量特性
Coriolis flowmeter
liquid hydrogen
finite element simulation
fluid-structure interaction
measurement characteristics
