新型旋叶分离器分离特性与机理研究

为定量地获得熔盐反应堆旋叶分离器中气泡的分离行为，采用计算流体力学（CFD）方法获得了分离器液相流场分布，基于涡旋模型耦合相间作用力的气泡分离模型开发了气泡运动的数值计算程序，快速预测了分离器内熔盐介质中气泡的临界分离直径。通过对气泡受力的量化，阐述了气泡的分离机理。分析表明，气泡受到的相间作用力的大小与其运动到分离器内不同半径位置密切相关；气泡在轴向上受到的附加质量力分力和曳力分力决定着气泡分离长度；气泡在径向上受到的压力梯度力、升力与曳力、附加质量力相平衡时，其不能再向心运动进入气芯被捕获分离。 

Study on Separation Characteristics and Mechanism of a New Swirl Vane Separator

In order to obtain the bubble separation behavior in the swirl vane separator of the molten salt reactor quantitatively, the liquid flow field distribution inside the separator was obtained by computational fluid dynamics method. Based on the bubble separation model that coupling the vortex model and interphase force, the numerical calculation program of bubble motion was developed to quickly predict the critical separation diameter of the bubble in the molten salt medium in the separator. By quantifying the force acting on the bubble, the separation mechanism of the bubble has been demonstrated. The analysis indicates that the interphase force of the bubble closely relates to the position of different radius in the separator. The virtual mass force and drag force acting on the bubble in the axial direction determine the bubble separation length. When pressure gradient force, lift force, drag force as well as virtual mass force acting on the bubble reach a balance in the radial direction, it can no longer centripetally move into the air core and be captured and separated.