Gamma-Theta转捩模型在绕翼型流动问题中的应用  

Application of gamma-theta transition model to flows around airfoils

作　　者：陈奕[1] 高正红[1] 

机构地区：[1]西北工业大学航空学院,陕西西安710072

出　　处：《空气动力学学报》2009年第4期411-418,共8页Acta Aerodynamica Sinica

基　　金：国家自然科学基金项目(90205020)资助

摘　　要：在非结构RANS求解器上实现了完全基于流场当地变量和转捩经验关系式的γ-Reθt转捩模型,并利用该模型对S809和NLF0416两种翼型在中等迎角以及大迎角下的低湍流度绕流问题进行了计算。计算结果表明该模型可以准确地预测自然转捩、分离泡转捩和再层流化等各种转捩现象,中等迎角下预测的转捩发生位置和升阻力系数与实验吻合较好,大迎角下该模型也捕捉到了前缘分离泡。同时计算结果也表明该模型预测结果受物面流向网格密度和对流项数值离散格式影响较大,计算时须加以注意。The γ-^-Reθt,transition model which is purely based on local variables and empirical transition correlations is implemented on the nonstructural RANS solver and then is applied to the predictions of flows of low freestream turbulence level around the airfoils of S809 and NLF0416 at moderate and large angles of atattack. The computational results indicate that the model can predict various types of transition accurately such as natural transition, separated bubble and relaminarization. Good agreement with the available experimental data such as transition onset loeations and lift and drag coefficients was observed in the eases of mod- erate angles of attack, while the leading edge separated bubble at large angles of attack was predicted as well. The computational results also indicate that the model is sensitive to the streamwise thickness of computational grid on the wall boundary and to the diseretization scheme of the convective terms.

关 键 词：转捩模型 间歇因子 转捩雷诺数 当地变量 涡量雷诺数 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]