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多尺度性是湍流混合的重要特征,本文建立了湍流下物料间的宏观混合和微观混合模型,利用计算流体力学软件Flu- ent6对喷嘴直径为2.5 mm、混合段直径为6 mm、混合段长度为90 mm的喷射器混合段物料的混合状况进行了模拟。对模型进行求解的过程中,进行了网格无关性验证,求解了k-ε方程、流动方程和所建立3个标量方程。求解模型中3个标量方程时,使用了Fluent中的user defined function(UDF)。最终获得了喷射器混合段内宏观混合和微观混合的详细信息,为喷射器的优化及放大设计提供了重要的依据。
Multi-scale is an important feature of turbulent mixing. In this paper, macroscopic mixing and microscopic mixing models are established for turbulent flow. Using computational fluid dynamics software Flu-ent6, the nozzle diameter is 2.5 mm, the mixing diameter is 6 mm, the mixing length The mixing of 90 mm ejector mix sections was simulated. In the process of solving the model, the grid-independent verification was carried out and the k-ε equation, the flow equation and the three scalar equations established were solved. The user defined function (UDF) in Fluent was used to solve the three scalar equations in the model. Finally, the detailed information of macroscopic mixing and microscopic mixing in the mixing section of the ejector is obtained, which provides an important basis for the optimization and enlargement design of the ejector.