Abstract: Aiming to clarify the interaction mechanism of gas-liquid cross-zone rotating flow in the rotational flow zones and packing zones of composite tridimensional rotational flow sieve tray (CTRST), the CTRST was investigated based on a dual Eulerian two-phase flow simulation method. The flow interaction between the two zones was described by the volume flow ratio of the gas and liquid phases, and the interaction mechanism of liquid phase distribution, pressure and velocity fields under the interaction between the two zones was analyzed, and compared with that of a single rotational flow configuration tray. The results indicated that the mass flow rate ratio of gas-liquid phase in the rotational flow zone always accounted for over 60%, the axial cross-section where the maximum value of the gas-liquid volume flow ratio was located transforms with the change in gas-liquid volume. The cross-section of the maximum gas-liquid phase volume flow ratio rose from Z=25 mm to Z=10 mm as Lw increased, and decreased from Z=25 mm to Z=40 mm as Fs increased. The packing zone had a strong buffering effect on the rotating flow. It significantly slowed down the trend of pressure reduction in the rotational flow zone, and the addition of packing did not affect the balance of pressure drop between the two zones. The structures of the packing zone and the rotational flow zone had a relatively uniform blocking effect on gas-liquid two-phase flow, and the pressure drop distribution was relatively uniform. There was a transition point in the rotational flow zone that changed the direction of the rotating flow, and the position of the transition point moved inward axially towards the inner cylinder. Compared to a single rotational flow configuration tray, the inward shift of the CTRST transition point improved the liquid holding capacity of the rotational flow zone and promoted gas-liquid interaction flow between the two zones.

Key words: composite tridimensional rotational flow sieve tray, two-phase flow, gas-liquid phase volume flow ratio, two-zone interaction, transition point

摘要： 针对复合立体旋流筛板(CTRST)中旋流区和填料区气液跨区耦合流动交互影响机制不清晰等问题，本工作基于双欧拉两相流法对CTRST进行了模拟。使用气、液相体积流量比描述了塔板两区气液相流动分配情况，并与单旋流构型塔板进行对比，分析两区交互影响下液相分布、压力场和速度场交互影响机制。结果表明，旋流区气液相体积流量比始终占据60%以上，气液相体积流量比最大值所在轴向截面随气液量变化发生转变。最大气、液相体积流量比截面随Lw增大而上升，由Z=25 mm移动到Z=10 mm处；随Fs增大而下降，由Z=25 mm移动到Z=40 mm处。CTRST中填料区对旋流流动具有较强的缓冲作用，显著减缓了旋流区压力降低趋势，填料的加入并未影响两区压降的平衡；两区结构对于气液两相流动的阻滞作用较为均匀，压降分布较为均匀。在旋流区存在使旋转流方向转变的过渡点，且过渡点位置沿轴向朝内筒方向内移。相比单旋流构型塔板，CTRST过渡点的内移提高了旋流区的持液能力，促进了两区之间气液交互流动。最大气、液相体积流量比截面随Lw增大而上升，由Z=25 mm移动到Z=10 mm处；随Fs增大而下降，由Z=25 mm移动到Z=40 mm处。

关键词: 复合旋流筛板, 两相流, 气液相体积流量比, 两区交互, 过渡点