Secondary Goertler instability in hypersonic boundary layers
Secondary Goertler instability in hypersonic boundary layers
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DOI：
10.2514/6.2001-273
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发表时间：
2001-01
期刊：
影响因子：
--
通讯作者：
C. Whang;X. Zhong
中科院分区：
文献类型：
--
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涡的非线性发展使平均流场发生畸变，不仅在壁面法向，而且在展向都产生了强烈的弯曲，从而诱发了二次不稳定。在Gortler涡的破裂过程中，涡中出现了非定常的波动。这一过程是通过一个次要的不稳定性。本文采用二维线性稳定性分析和数值模拟的方法研究了高超声速Gortler涡的二次不稳定性。为了寻找高超声速Gortler涡的二次模态，发展了一个二维线性稳定性程序。通过线性稳定性分析得到的模式被施加在计算域的入口处。通过求解完整的Navier-Stokes方程，进行二次模态的后续发展。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.