T形管内雾状气液两相流相分离特性研究

Study on Phase Separation Characteristics of Gas-liquid Mist Flow in T-pipe

针对管汇系统中普遍存在并联引出管内气液两相流量分配不均及气液比例不同的现象,开展了T形管内雾状气液两相流相分离特性研究。通过数值模拟研究,得到了水平T形管内两相流动特性、轴向压降变化规律及相分离特征。研究结果表明:空气-水雾状流在T形管水平主管分流处的流速与压力急剧变化、相分离现象显著,而在远离分流处,流速稳定、压力变化缓慢、气液两相分布均匀;该雾状流沿水平主管和侧支管的轴向压降在分流处大幅变化,而在远离分流处,压降变化规律与正常管输压降变化规律一致;流体扰动、气液两相惯性力差异及其相互作用等造成雾状两相流在管内相分配不均。研究结果可为实际工程中的管汇设计及优化提供理论依据。

Aiming at the phenomenon of uneven distribution of gas-liquid flow and different gas/liquid ratio in parallel lead-out pipe universally existed in manifold system,the phase separation characteristics of gas-liquid mist flow in T-pipe were studied.By means of numerical simulation study,the two-phase flow characteristics,axial pressure drop variation law and phase separation characteristics in horizontal T-pipe were obtained.The study results show that the velocity and pressure of air-water mist flow change rapidly and the phase separation phenomenon is obvious at the horizontal main pipe diversion point of T-pipe,while the velocity is stable,the pressure changes slowly and the gas-liquid distribution is uniform at place far away from the diversion point;the axial pressure drop of the mist flow along the horizontal main pipe and the lateral branch pipe changes significantly at the diversion point,while the pressure drop variation is consistent with that of the normal pipeline at place far away from the diversion point;the fluid disturbance,the inertia force difference and interaction of gas and liquid cause the phase distribution of mist flow to be uneven in the pipe.The research conclusions provide theoretical basis for the design and optimization of manifold in practical engineering.