【摘要】 利用一种单丝电容探针,对水平管内机油-水两相流的水相高度进行测量.实验中油、水相折算速度分别为0~0.2 m/s和0~0.8 m/s,覆盖了水为连续相的全部流态:包括波状分层流、三层流、水包油/水和水包油4种流型.每种流型下,给出了水相高度输出曲线和相应的流型结构,分析了不同流型下探针的检测性能.结果表明,单丝电容探针的敏感系数高达1.52 pF/mm,探针能够检测到连续相的水,无法检测到乳化在机油中的水.随着油泡尺寸的减小和速度的上升,探针识别油泡的能力逐渐下降.不同流型下的水相高度曲线特征各不相同,相应曲线的统计参数能够准确描述流型特征,以此为基础,有望实现流型识别.更多还原

【Abstract】 A new single-wire capacitance probe with a high sensitivity of 1.52 pF/mm was used to measure water layer height in oil-water two-phase flows in horizontal pipes.The probe performance is not influenced by water conductivity at all.Experimental conditions cover all the four typical flow patterns with water continuous,including stratified wavy,three layer,dispersed oil in water & water,and dispersed oil in water.The superficial velocity ranges of oil and water are 0-0.2 m/s and 0-0.8 m/s,respectively.Water layer height with time is given for each flow pattern as well as the flow structure.The experimental results show that continuous water instead of discrete droplets can be detected.The detecting ability of the probe decreases as oil bubble size becomes smaller or the velocity becomes higher.The statistical parameters of water-layer-height curves are completely different from each other,by which flow patterns can be(identified.)更多还原