Abstract: T⁃shaped multi⁃branch pipeline is a kind of T⁃shaped pipeline with complex multi⁃branch structure, which is now widely used in the research of two⁃phase and multi⁃phase flow.In this article,the fluid simulation tool Fluent was used to simulate the oil and gas two⁃phase flow in the T⁃shaped pipeline at different times with obtained the oil and gas separation characteristics of each branch and the mass flow data of the inlet and outlet.The results indicate that, when the oil and gas two⁃phase mixed infusion flows through the T⁃shaped pipeline, the phase distribution of the oil and gas two⁃phase in the pipeline is uneven due to the effect of gravity.With the increase of time, the gas⁃outlet at the top is mostly gas, while the oil⁃outlet at the bottom is mostly liquid, thus achieving a initial separation of oil and gas. T⁃shaped pipeline with different branch pipe heights are selected for simulation, and the characteristics of oil⁃gas separation phenomena are analyzed. Then select different inlet velocity of T⁃shaped main pipe to observe the effect of inlet velocity on oil⁃gas separation.Finally, by analyzing the turbulent vortex structure and flow field characteristics in the pipeline, the turbulence coherent structure shows the characteristics of regularity and repeatability under the same structural parameters, and the influence of branch pipeline on flow pattern and turbulence vortex.

Key words: T?shaped multi?branch pipeline, Oil and gas separation, Two?phase flow, Simulation, Fluent

摘要： T形多分支管分离器含有复杂多分支结构，广泛应用于两相及多相流研究中。借助流体模拟仿真工具Fluent，模拟了不同时刻T形管中油气两相流动情况，得到了各分支管内油气分离特性及进出口处的质量流量数据。结果表明，当油气两相混输液流经T形管时，重力的作用使管道中的油气两相分布不均匀；随着时间的增加，顶部汇气管的输出物大部分为气体，而下方汇油管的输出物大部分为液体，从而实现油气的初步分离。选取分支管高度不同的T形管进行仿真，分析其油气分离现象的特性；再选取不同的T形管主管入口流速，观察入口流速对油气分离现象的影响；最后，通过观察各管道的湍流旋涡结构和流场特性，研究湍流拟序结构在相同结构处的规律性和重复性的特点，以及分支管高度对流型和湍流旋涡的影响。

关键词: T形多分支管, 油气分离, 两相流, 仿真模拟, Fluent