搅拌头偏心布置对物料悬浮颗粒分散性的影响

用聚丙烯代替悬浮颗粒，采用数值模拟的方法对刘场进行了深入研究。首先通过试验分析，取得了满意的数值模拟效果后，采用标准 湍流模型对偏心搅拌流场进行模拟。然后针对不同模拟工况进行试验验证比较，分析不同的偏心程度对速度分布、湍动能大小、物料（聚丙烯）混合效果以及混合时间的影响。研究表明，偏心率为0.22左右，浸入深度在容器高度的35%时，流场分布比较均匀，死区较小，更有利于物料混合，搅拌效果最好。 The polypropylene was used as suspended particle, and numeral simulation was performed to investigate the effects of different stirring styles. The model was first examined based on the CFD simulation and experiments to obtain the reasonable results, and then the k-εunsteady model was adopted to simulate the flowing field of eccentric agitation. The simulated results were verified with the experimental results to analyze the impacts of different eccentric degrees on the velocity distribution, turbulence kinetic energy, and mixing effects and time of polypropylene. The results showed that the offset ratio is about 0.22, and when the immersion depth is 35% of the bottle height, the flowing field is well distributed with small “death zone”, which is beneficial to the mixing of polypropylene.