组合桨搅拌槽内部流场数值模拟

针对组合桨组合形式在不同应用场合的匹配问题,采用计算流体力学(CFD)的分析方法,基于Fluent仿真软件,分析双螺带及六斜叶涡轮桨基于不同组合位置的内部流场情况采用多重参考系(MRF)方法建立基础模型,基于Navier-Stokes方程和标准k-ε湍流模型对搅拌槽内部流体产生的流场进行数值计算,得到搅拌桨在240 r/min的搅拌转速下产生的流场数据.分析搅拌器在特定界面处轴向、周向、径向的速度矢量图以及其综合速度云图,并对位置互换的流场进行分析和比较,选出上双螺带桨下涡轮桨为最佳的桨叶组合形式,此种组合桨型对于提升搅拌器在相关领域的应用和发展等有参考价值.

Numerical simulation of internal flow field in stirred tank with combined impeller

In order to solve the problem of extensive application in the mixing field, the position of the double-belt agitator and the hexagonal oblique disc turbo agitator was changed by the computational fluid dynamics(CFD)analysis method. Based on the Navier-Stokes equation and standard k-ε turbulence model, the flow field generated by the internal fluid of the stirred tank is numerically calculated to obtain the flow field data of the stirring blade at the stirring speed of 240 r/min. We analyzed the axial, circumferential, radial velocity vector of the agitator at the specific interface and its integrated velocity contour, and compared the flow field of the position change. The suitable industrial production paddle type for the upper double-helical paddle impeller blades was selected as the best combination of paddles. The combination of these paddles is helpful to improving the mixer in the application and development.