T形多分支管结构参数对气液分离特性的影响

Impact of Structural Parameters on the Separation Characteristics of Gas-Liquid Two-Phase Mixture in Combined T Junctions

T形多分支管作为新型气液分离构件,具有紧凑、稳定、经济等优点。采用混合k-ε湍流模型与欧拉多相流模型对T形多分支管中的气液两相流动进行了模拟分析,考察了其结构参数的变化对分离性能的影响。结果表明,结构一定的T形多分支管,确定的进出口边界条件决定了唯一的水力平衡系统,流体所具有的能量在管路中自由分配直至达到平衡,分流促进了气液两相的分离。分支管间距增大,能使气液两相分离效率得到显著提高,但增幅逐渐降低;分支管高度、管径增大时,分离效率均呈现先增大后减小的趋势;分支管结构参数的变化促使流体流动方向发生改变,进而影响分离效率。

The combined T junctions used for gas-liquid separation have the advantage of compactness, consistency and economy. The mixture ks turbulence model and the Eulerian multi-fluid model were used to simulate the flow and phase distribution in the combined T junctions. Flow separation mechanism of combined T junctions and the impact of the variety of the branch pipe spacing, height and diameter were analyzed. The results of simulation showed that the fixed inlet and outlet boundary of certain multi-T junctions determined a single hydraulic balance system, and the fluid energy distributed freely until it achieved a balance. The split of the flow promoted gas- liquid two-phase separation. Separation efficiency improved with increasing branch pipe spacing, but the rate of increase slowed down at the late stage. As the height and the diameter of branch pipe changed, the separative efficiency showed at first an increasing and then a decreasing trend. Branch pipe spacing was the most important parameter among the three. The variety of branch pipe structures could alter the flow direction of branched pipes, and guide the design of combined T junctions.