垂直下降管内油气水三相流的摩擦压降研究

Experimental Studies on the Frictional Pressure Drop of Oil-Water-Air Three- phase Flow in Vertical Downward Pipe

摘要: 对垂直下降钢管内油气水三相流动的摩擦压降受折算液速、折算气速和油水混合物中含水率的影响进行了试验研究。由于气速的改变, 三相流动出现了不同的流型, 使得流动的摩擦压降变化也表现出不同的变化趋势, 特别是在未充分发展的环状流区域, 由于液膜被气芯撕裂并携带液相, 因此导致摩擦压降随着气速的增加反而降低。当含水率在18%~50%以内时, 随着含水率的增加, 液相粘度的减小, 摩擦压降减小, 当大于50%时, 随着含水率的增加, 混合物的密度增加, 摩擦压降增加。

Abstract: Effects of superficial gas/liquid velocities and water volume fraction on the frictional pressure drop of three-phase flow in vertical downward pipe (40 mm i. d.) are experimentally investigated. According to the effect of superficial gas velocity, the change of frictional pressure drop of three-phase flow can be divided into several different regions, which are primarily attributed to the change of flow patterns. When water volume fraction increases from 18% to 50%, the frictional pressure drop gradient decreases. When above 50% water volume fraction, the frictional pressure drop gradient increases with the increase of water volume fraction.