【摘要】 为探究不同作用类型的搅拌叶片在固-液两相流中对固相颗粒的作用方式及作用效果，以聚偏氟乙烯制备过程中搅拌反应釜为研究对象，采用EDEM-Fluent联合仿真的方法对3种不同类型的搅拌叶片进行数值模拟，并对液相流场特性、固相颗粒分布及运动轨迹等进行相应对比分析。结果表明：开启涡轮叶片在颗粒分散时对颗粒剪切效果最为显著；六直叶圆盘涡轮叶片对颗粒的带动能力最强，相较于其他两种方案其颗粒所具能量分别高出14.70%和25.81%;使用推进叶片的搅拌反应釜其颗粒的轴向输运最为显著，釜内流体的循环及颗粒分布明显优于另两种方案的，且颗粒分布RSD指数最小仅为0.89,远小于另两种方案的1.08与1.41。因此，在制备聚偏氟乙烯过程中，为使反应釜内颗粒充分扩散，组合叶片中应尽量包含推进叶片。更多还原

【Abstract】 In this article, in order to explore the action mode and effect of the stirring blades with different action types on the solid particles in the solid-liquid two-phase flow, the stirring reactor used for preparing the polyvinylidene fluoride is studied. Three different stirring blades are numerically simulated by the EDEM-Fluent joint simulation method. The characteristics of the liquid flow field, the distribution of solid particles and the motion trajectory are compared and analyzed. The results show that the open turbine blades have the most significant effect on particle shearing when the particles are dispersed. The six-straight-blade disc turbine blades have the strongest driving ability to the particles; the energy of the particles is 14.70% and 25.81% higher than that of the other two schemes, respectively. The advancing blades are greatly helpful to the axial transport of the particles in the stirring reactor. The circulation and particle distribution of the fluid in the reactor are significantly better than that of the other two schemes; the RSD index of particle distribution is merely 0.89 at the lowest, which is much lower than 1.08 and 1.41 of the other two schemes. Therefore, when the polyvinylidene fluoride is prepared, the combined blades should include the advancing blades, in order to fully disperse the particles in the reactor.更多还原