气液搅拌流场中不同通气结构的CFD模拟

CFD(Computational Fluid Dynamics) Simulation of Different Aeration Structures in a Gas-liquid Agitation Flow Field

使用数值模拟的方法研究了气液两相在同一种搅拌反应器、4种不同氧化喷枪结构的流场特点,采用Euler-Eu-ler双流体模型,用RNGk-ε两方程湍流模型分析流场、多重参考系法处理搅拌桨区域,获得了不同氧化喷枪结构的流场气含率。结果表明:90°弯管带翼结构可以达到更好的搅拌效果,速度场更合理,气泡轨迹更理想,并且在典型平面上的气含率更高。

By using a numerical simulation method,studied were the features of a gas-liquid two phase flow field in a same kind of agitation reactor with four types of different oxidation spray gun structures.With a Euler-Euler dual fluid model a flow field was analyzed by adopting RNG k-ε two-equation turbulent flow model.A mortar agitation zone was processed by using a multiple reference system method.As a result,the air content in the flow field of different oxidation spray gun structures was obtained.It has been found that 90 degree tube-bend finned structure can be used to attain a better agitation effectiveness,a more rational velocity field,a more ideal air bubble trajectory and a higher air content on a typical surface.