基于Fluent的流场数值模拟在制脂釜设计中的应用

基于Fluent平台,采用多重参考坐标法(MRF),以2#通用锂基润滑脂为工作介质,对桨框组合式双向搅拌脂釜内流场进行数值模拟。考察应用内外双向搅拌方式以及变形折叶桨时,制脂釜内宏观流场的分布特点,分析了折叶角θ、桨间距l和搅拌转速ω等参数的变化对流场的影响。结果表明,双向搅拌和变形折叶桨明显改善了物料流动状况;折叶角θ取45°时产生的流场分布较22°、60°更优;当桨间距l在(0.16~0.24)D范围内取值对流动特性和搅拌功率影响不大;内桨搅拌ωi转速高于200r/min后,提高转速无益于流场改善。

Application of Numerical Simulation of Flow Field Based on Fluent in Design of Stirred Tanks for Oils

A numerical simulation was made of the flow field in the paddle-frame combination type bidirectional stirred tanks for oils using the multiple reference frame with 2# universal lithium-base grease oil as a working medium based on Fluent platform. In the applications of the internal and external bidirectional stirring forms and deformed paddles, the distribution characteristics of the macroscopic flow field were investigated, the influences of the changes of the paddle angle θ,the paddle spacing l, stirring rotary speed ω, and other parameters on the flow field were analyzed. The result show that the bidirectional stirring and deformed paddles can evidently improve the flow of materials; the flow distribution induced with 45°of paddle angle is better than that induced with 22°and 60°of paddle angle; the influence of the paddle spaces l among (0.16~0.24)D on the flow characteristics and stirring power is not great; the flow field shall not benefit from increasing rotary speed when the stirring rotary speed ωi of the internal paddles is beyond 200r/min.