Secondary Görtler Instability in Hypersonic Boundary Layers
Secondary Görtler Instability in Hypersonic Boundary Layers
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DOI：
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发表时间：
2000-11
影响因子：
4.6
通讯作者：
C. Whang;X. Zhong
中科院分区：
文献类型：
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作者：
C. Whang;X. Zhong
本文研究了高超声速边界层中的二次Gortler不稳定性。Gortler涡的非线性发展扭曲了平均流动，导致壁面法向和展向的高度弯曲，从而导致了二次失稳。在戈特勒旋涡的分解过程中，旋涡内部会出现非定常的脉动。这一过程是通过二次不稳定进行的。本文采用二维线性稳定性分析和数值模拟相结合的方法研究了高超声速Gortler涡的二次失稳问题。为了寻找高超声速Gortler涡的二次模，开发了二维线性稳定性程序。将线性稳定性分析得到的振型施加在计算域的入口处。次模的后续发展是通过求解完整的N-S方程进行的。我们研究了高超声速边界层中的二次Gortler不稳定性。
Secondary Gortler instability in hypersonic boundary layers is studied in this paper. The nonlinear development of Gortler vortices distorts the mean flow and leads highly inflectional profiles not only in wall normal direction but also in spanwise direction which induce the secondary instability. In the break-down process of Gortler vortices, unsteady fluctuations appear in the vortices. Such process is through a secondary instability. In this paper, secondary instability of hypersonic Gortler vortices is studied using two-dimensional linear stability analysis and numerical simulations. A two-dimensional linear stability code is developed in order to find secondary modes of hypersonic Gortler vortices. The mode obtained by linear stability analysis is imposed at the entrance of the computational domain. Subsequent development of the secondary mode is carried out by solving the full Navier-Stokes equations. We investigate secondary Gortler instabilities in hypersonic boundary layers.