蒸汽流速对旋叶式汽水分离器分离性能影响的数值模拟

Numerical Simulation on Effect of Steam Velocity on Separating Property of Cyclone Separator

基于两流体模型和雷诺应力湍流模型,在不同的入口流速条件下,对旋叶式汽水分离器的分离过程进行了数值模拟,分析了蒸汽流速对不同直径液滴分离过程以及壁面附近液膜或高液滴浓度弥散层的影响规律。研究表明,蒸汽流速对分离性能的影响与液滴直径有关,当液滴直径处于某一区域时,蒸汽流速对分离性能的影响较明显,蒸汽流速越大,分离性能越好;当蒸汽流速较低时,在分离筒壁面出现液相流体累积。

In the present paper, numerical simulation on separating process of cyclone separator used in the steam generator is performed under conditions of different steam velocity based on two-fluid model and Reynolds Stress Model. The effect of steam velocity on separation process of droplets is analyzed. The simulation results show that the effect of steam velocity on separation property is related with droplets diameter. The effect of steam velocity is significant and separation efficiency increases with the increasing of steam velocity only when the droplets diameter is in a certain range. It is also found that liquid stack will happen on the wall of cyclone separator when steam velocity is small.