矩形截面螺旋通道内气液两相流局部含气率分布实验研究

摘要

应用电导探针测量技术,对矩形截面螺旋通道内气液两相流局部含气率进行实验研究.在不同的气相折算速度下,应用电导探针测量了弹状流弹单元的长度,并与可视化方法进行对比,验证了电导探针的可靠性,并为信号处理选择合适的阈值.分别在泡状流、弹状流及环状流三种流型的条件下,分析了气相与液相折算速度对局部含气率分布的影响.实验结果发现,螺旋通道气液两相局部含气率呈非对称的抛物线形分布,这种非对称性受流型和液相折算速度的影响.%An electric conductivity probe was designed to study local void fraction of gas-liquid two-phase flow in a rectangular helically coiled channel. Reliability of the electric conductivity probe was verified by measuring length of Taylor bubble at various gas superficial velocity and by comparing it to visualization measurement. A suitable threshold value was determined for signal processing. Effects of liquid and gas superficial velocities on local void fraction distribution were investigated at three regimes of bubbly, slug and annular flow. The experimental results show that local void fraction distribution of gas-liquid two-phases in helically coiled channel is asymmetric parabola, which the asymmetry is dependent on flow regime and liquid superficial velocity.