摘要
针对用于天然气流量测量的大口径双U型科里奥利流量计,基于ANSYS搭建了流量计仿真模型,并采用双向流固耦合方法对其进行了模拟研究,计算分析了不同工况下该科氏流量计的流场特性、振动特性及影响规律。对于同一结构而言,其入口质量流量、工作压力的改变对其模态频率影响不大。振动管的时间差和相位差随流量的增加呈线性增长的趋势,同时拾振器处的振幅随流量的增加在小范围内逐渐减小。在相同的质量流量下,随着流体压力的增大,测量管拾振器处的相位差、时间差也随之减小,且当压力升高时,其测量管的振幅明显下降。此外,由于气体的可压缩性和弯管结构的存在,导致气体在测量管内的沿程速度和密度分布逐渐呈现不均匀的趋势,使得测量管的受力不均,从而进一步引起测量误差。
For the large diameter double U-shaped Coriolis flowmeter used for natural gas flow measurement,the flowmeter simulation model was built based on ANSYS,and the two-way fluid-structure coupling method was used to simulate it.The flow field characteristics,vibration characteristics and influence rules of the Coriolis flowmeter under different working conditions were calculated and analyzed.For the same structure,the change of inlet mass flow rate and working pressure has little effect on the modal frequency.The time difference and phase difference of the vibrating tube show a linear growth trend with the increase of flow rate,while the amplitude at the vibration pickup gradually decreases within a small range with the increase of flow rate.Under the same mass flow rate,as the fluid pressure increases,the phase difference and time difference at the vibration pickup of the measuring tube also decrease accordingly.Moreover,when the pressure rises,the amplitude of the measuring tube drops significantly.In addition,due to the compressibility of the gas and the existence of the bent pipe structure,the velocity and density distribution of the gas along the measuring tube gradually show an uneven trend,causing uneven force on the measuring tube and further leading to measurement errors.
作者
裴全斌
青青
薛永鑫
侯阳
吴世杰
王吉开
PEI Quanbin;QING Qing;XUE Yongxin;HOU Yang;WU Shijie;WANG Jikai(Wuhan Metrology Research Center,West-East Gas Transmission Branch,National Oil and Gas Pipeline Network Group Co.,Ltd.,Wuhan,Hubei 430073,China;Wuhan Branch,National Oil and Gas Large Flow Metering Station,Wuhan,Hubei 430073,China)
出处
《石油工业技术监督》
2025年第10期24-30,共7页
Technology Supervision in Petroleum Industry
关键词
科氏质量流量计
流固耦合
天然气
流量测量
Coriolis mass flowmeter
fluid-structure coupling
natural gas
flow measurement
