基于湍流模型的转捩流动数值计算研究

TURBULENCE MODEL BASED NUMERICAL INVESTIGATION OF TRANSITIONAL FLOWS

本文通过求解雷诺平均NS方程,采用基于k-ω模型和添加控层流动能方程的三方程湍流模型计算转捩流动。相对于基于实验的转捩关系式模型,本模型对叶轮机械复杂的流动环境提供了更加真实的物理意义.ERCOFTAC T3系列实验和低压涡轮叶栅的算例表明该模型能够自动捕捉流动的转捩过程,但还需要进一步修正以能更加准确考虑各种因素对转捩的影响。

In this paper the Reynolds-averaged Navier-Stokes approach with the laminar kinetic energy model based on k-ωturbulence model is utilized to investigate the transition flows.In contrast to experiment-correlation transition models,this approach provides more realistic significance for the complex flows in turbomachinery.The results from simulation of ERCOFTAC T3 experiments and a low-pressure turbine cascade show that the model has the capability to predict transition automatically;but further refinements are needed to account for more factors.