Extracting and Separating Method Type Gas-Liquid Two-Phase Flow Meter by Using Rotational Drum as Distributor
Wang Dong,Lin Yi,Lin Zonghu
(School of Energy and Power Engineering,Xi'an Jiaotong Unviersity,Xi'an 710049,China)

Abstract:A extracting and separating method£¨ESM£©type gas-liquid two-phase flow meter was proposed and tested in an air-water two-phase flow loop.By using a rotational drum distributor, a fraction (about 20%) of the two-phase mixture was proportionally extracted and conducted to a small compact separator which separate the mixture into single phase gas and liquid. Conventionª²al flowmeters were employed to meter the separated gas and liquid respectively. The total flow rates of each phase were then determined according to these metered values and the proportionali-ties (extraction ratios). After the separated gas and liquid had been metered they were returned to the main stream again. Because only a small portion of the total flow is extracted the separator can be reduced in size greatly compard to the conventional separation method. Experiments confirmed that the extraction ratio is equal to the ratio of extraction channel number to the total flow channel number inside the drum and independent of flow patterns. The average error of flow rates measurement was less than 5%.
Keywords: two-phase flow;flow meter;extracting and separating method;rotationaldrum