基于科氏质量流量计的两相流计量方法研究

Two-phase Flow Measurement Method Based on Coriolis Mass Flowmeter

基于黏性流体的气泡模型,以空气-水为介质,对科氏质量流量计应用于空气-水两相流流量计量的方法进行了实验研究。根据密度降对质量流量计测得的混合密度进行修正,得到两相流的含气率;根据气泡模型对测得的质量流量进行修正。当含气率小于8%时,修正后气液两相混合流体的密度相对误差在2%以内。修正后的质量流量相对误差小于修正前的相对误差。该方法避开了对滑脱速度、干度等复杂关系的分析,为含气率较低时两相流质量流量的准确测量提供了一种较好的解决方法。

Based on viscous fluids bubble model,the application of Coriolis mass flowmeter to gasliquid two-phase flowrate measurement is studied.Firstly,density derived from Coriolis mass flowmeter is modified according to density drop.Then,voidage of two-phase flow is calculated.Lastly,flowrate is corrected based on bubble model.Experimental results show that the relative error of gas-liquid two-phase flow density is within 2% when voidage is less than 8%.The relative error of mass flow rate after correction is less than that before correction.This method avoids analyzing slippage velocity and dryness fraction and so on.It also shows that correction model plays a good performance,and the relative error of corrected flowrate decreases.