二维平板可压缩边界层的二次稳定性分析

Analysis and Calculation of Secondary Instability of Two_Dimensional Compressible Boundary Layer Flows of A Plate

本文在二维可压缩边界层中应用Ｆｌｏｑｕｅｔ分析，建立了控制次谐波稳定性的方程组，研究在二维可压缩边界层转捩过程中二维有限振幅的Ｔ＿Ｓ波对三维线性小扰动的作用，并计算了来流马赫数对次谐波的产生和发展情况的影响。

Thia paper used the Floquet's three_dimensional linear stability theory in the analysis of two_dimensional compressible boundary layer, a set of stability equations is constructed, the effect of three dimensional linear small perturbation on the two_dimensional compressible boundary layer transition is studied, and the effect of coming flow Ma number on growth and development of the subharmonics is calculated. It can be seen from the calculations, the effect caused by the interaction of two_dimensional and three_dimensional perturbation waves on the development of two_dimensional compressible laminar boundary layer.