This paper proposes a novel horizontal gas–liquid pipe separator with a compact structure based on the phase-isolation. In the separator, the gas–liquid two-phase flow is firstly isolated as a swirling annular flow by a swirler, where gas core and liquid film spiral and flow forward in parallel. Based on the flow characteristics of the swirling liquid film, a downward tangential liquid extraction channel is designed, which is tangent to the swirl trajectory of the liquid film. Then the swirling liquid film can be directly separated by falling into the downward tangential channel under the combined action of its kinetic energy and gravity. On the basis of this structure, the inner thread on the wall, different lengths of liquid extraction channel and tangential gas return channel are designed individually to study their effect on the separation efficiency. Experiments were carried out to investigate the separation performance of the separator. The results show that when the superficial velocity of gas reaches 20 m/s, the separation efficiency can be higher than 94% with the superficial velocity of liquid in a large range of 0.02–0.264 m/s. The design of inner thread is beneficial for separation when the liquid film has a certain thickness. The length of liquid extraction channel has an opposite influence on separation efficiency at low gas velocity and high gas velocity. The gas return flow channel deteriorates the separation performance for the reason that the returning gas will carry a large number of liquid droplets into the main pipe.

本文提出了一种基于相隔离的结构紧凑的新型卧式气液管道分离器。在分离器中，气液两相流首先被旋流器分离为旋涡环状流，气核与液膜呈螺旋状平行向前流动。根据旋流液膜的流动特性，设计了向下切向的液体抽取通道，该通道与液膜的旋流轨迹相切。然后旋转的液膜在其动能和重力的共同作用下落入向下的切向通道，直接分离。在这种结构的基础上，墙上的内螺纹，分别设计了不同长度的液体提取通道和切向气体返回通道，以研究它们对分离效率的影响。进行实验以研究分离器的分离性能。结果表明，当气体表观速度达到20 m/s时，分离效率可达94%以上，液体表观速度在0.02～0.264 m/s的大范围内。内螺纹的设计有利于液膜有一定厚度时的分离。在低气速和高气速下，液体提取通道的长度对分离效率具有相反的影响。由于回流气体会携带大量液滴进入主管，气体回流通道使分离性能变差。