采用在线式可视化图象技术，对管网中的特征结构元件——等直径水平Ｔ形分叉管（Ｄ＝３５ｍｍ）的空气－水泡状流、弹状流、分层流的相分离现象进行了实验研究，发现并定义了“新型完全相分离现象”，即在特定工况下，入流的气相流体将完全从直管出口流出．另外通过可视化研究对“压力波反馈效应”及“分叉管中气相重组现象”进行了分析和探讨；将入口质量流量、入口干度及支管质量抽走率对两相分离率的影响作了比较和分析． The on-line visual image technique was used to analyze the phase separation phenomenon of the air-bubble, slug and stratified flow of the characteristic structural elements in pipe network - equal-diameter T-shaped divergent pipes (D = 35mm) The experimental study found and defined a “new type of complete phase separation phenomenon”, that under certain conditions, the incoming gas-phase fluid will flow completely out of the straight pipe exit. In addition, the “pressure wave feedback effect” and the “gas phase recombination phenomenon in bifurcated pipe” were analyzed and discussed through visualization studies. The effects of inlet mass flow rate, inlet dryness, and branch pipe quality extraction rate on the two-phase separation rate were analyzed comparison and analysis.