Study on Measurement of Two-phase Gas-liquid Flow Based on Coaxial Phase
FANG Li-de1,2, LANG Yue-xin1,2, ZHAO Ning1,2, LI Xiao-ting1,2, WEI Zi-hui1,2
1.College of Quality and Technical Supervision,Hebei University, Baoding, Hebei 071000, China
2.National Local Joint Engineering Research Center for Metering Instruments and Systems, Hebei University, Baoding, Hebei 071000, China
Abstract：In order to accurately measure the void fraction of gas-liquid two-phase flow, a coaxial phase difference measurement method was proposed. The coaxial line sensor was used to obtain the void fraction of the mixed medium by measuring the change of the phase difference after the electromagnetic wave was distributed through the gas-liquid mixed medium having different distribution conditions in the coaxial line. The design of the coaxial line measurement circuit and the measurement sensor were completed, and a void fraction measurement model was established. Subsequently, the indoor static experiment was carried out with gas-liquid two-phase. The error analysis of the sensor response and experimental results under the vertical tube state was carried out. The results show that the phase difference output is linear with the void fraction. At the same time, the relative error between the prediction result and the experimental result is within ±5% at different frequencies, indicating that the prediction model has better accuracy.
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2020, Vol. 41 
