A Study on Instability of a Supersonic Shear Layer Influenced by Solid Wall.

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  • 固体壁の影響を受ける超音速せん断層の不安定性に関する研究
  • 固体壁の影響を受ける超音速剪断層の不安定性に関する研究
  • コタイヘキ ノ エイキョウ オ ウケル チョウオンソクセンダンソウ ノ フアンテイセイ ニ カンスル ケンキュウ

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Effects of solid wall on instability of a supersonic shear layer were investigated with the viewpoint of linear stability analysis. It is known that Mach waves become to be radiated from shear layers, as flow Mach number increases. In this case, because closed lower pressure regions of pressure perturbation, which grows to be core of vortex, cannot be formed in the shear layers, growth rates of disturbances are decreased extremely. In the present study, solid wall was set parallel to a supersonic shear layer. It is shown that, with the solid wall, outgoing Mach waves are reflected and turn back to the supersonic shear layer. The outgoing and incoming Mach waves form standing waves, and closed lower pressure regions are formed in the supersonic shear layer. It is shown that, with the solid wall, growth rates of disturbances are increased compared with that for without the solid wall.

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