基于SA和SSTγ-■模型对边界层转捩预测的比较

Comparison of Boundary Layer Transition Prediction Based on SA and SST γ-■ Model

利用作者共同研发的In-house代码TRANS3D平台,在SA和SST两种常用湍流模型框架下构建了γ-■转捩模型,并以二维低速S809层流翼型和三维小后掠跨音速F5层流机翼为对象,比较了两种不同湍流模型构架下γ-■转捩模型预测的气动力特性和流场分布。结果表明:两种转捩模型均能预测航空转捩计算中常见的分离流转捩和自然转捩类型,明显改善了中低雷诺数流场下的预测精度,但由于选取基准湍流模型的不同,基于SA和SST的γ-■转捩模型在流动细节上依然存在着一些差异。

Two transition models were developed in the framework of SA and SST turbulence model,which were based on the in-house code TRANS3D developed by the authors.The low speed S809 laminar airfoil and small sweep angle F5 laminar wing were chosen to evaluate the ability of the two transition models in the 2D and 3D boundary layer transition,the aerodynamic character and the distribution of flow-field are compared between the two transition models.The results show that the transition model in the two framework of turbulence model could both predict separation induced transition and nature transition in aerodynamic computation;the prediction accuracy is also improved effectively in the low/middle Reynolds number flow-field.However due to the differences of the SA and SST turbulence model,the γ-Reθt transition models based on this two model still exist some distinctions in the flow-field detail.