壁面温度条件对边界层转捩预测的影响  

Effect of Wall Temperature on Boundary Layer Transition Prediction Using Transition Model

作　　者：孔维萱[1] 阎超[1] 赵瑞[1] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191

出　　处：《航空学报》2013年第10期2249-2255,共7页Acta Aeronautica et Astronautica Sinica

基　　金：国家"973"计划(2009CB72414)~~

摘　　要：边界层的转捩预测是高超声速飞行器气动力和热防护设计的关键问题之一。基于此,研究了壁面温度条件对采用转捩模式预测边界层转捩的影响,对k-ω-γ转捩模式的时间尺度和间歇因子生成项进行了修正。在非湍流脉动概念所模化的不稳定扰动时间尺度中,考虑了壁面温度条件对流动转捩的影响,引入壁面冷却对不稳定扰动最大增长率、临界雷诺数等量的模化。采用修正后的k-ω-γ转捩模式计算高超声速小球头锥零迎角流动转捩问题,通过与稳定性分析和原始k-ω-γ转捩模式计算结果的对比,发现改进后的模式在绝热和等温两种壁温条件下,能够较为准确地模拟第一模态和第二模态的不稳定频率、最大增长率,并能正确预测转捩位置。The correct prediction of boundary layer transition is essential for a successful design of hypersonic flying vehi- cles. In this paper, the effect of wall temperature condition on boundary layer transition prediction using a transition model is studied. Modifications are made to the time scale based on non-turbulence kinetic energy and the production term of the in- termittency factor equation of k-co-y transition model. The effects of wall temperature condition on the maximum amplification rate and critical Reynolds number are considered when modeling the first and second mode. The influence of wall tempera- ture on a hypersonic boundary layer of a blunt cone with small nose bluntness at zero angle of attack is investigated by the modified k-w-y transition model. The improved model can provide reasonable results for the maximum amplification rate and the most unstable frequency of the first oblique and two-dimensional second mode both at adiabatic and .isothermal wall con- ditions. The transition locations predicted by the modified k-^-y transition model agree well with those obtained by stability analysis.

关 键 词：壁面温度 转捩模式 边界层 流动转捩 高超声速流动 

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]