Three-wave interactions of disturbances in a hypersonic boundary layer on a porous surface |
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Authors: | S A Gaponov N M Terekhova |
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Institution: | 1.Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Division,Russian Academy of Sciences,Novosibirsk,Russia |
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Abstract: | Interactions of disturbances in a hypersonic boundary layer on a porous surface are considered within the framework of the
weakly nonlinear stability theory. Acoustic and vortex waves in resonant three-wave systems are found to interact in the weak
redistribution mode, which leads to weak decay of the acoustic component and weak amplification of the vortex component. Three-dimensional
vortex waves are demonstrated to interact more intensively than two-dimensional waves. The feature responsible for attenuation
of nonlinearity is the presence of a porous coating on the surface, which absorbs acoustic disturbances and amplifies vortex
disturbances at high Mach numbers. Vanishing of the pumping wave, which corresponds to a plane acoustic wave on a solid surface,
is found to assist in increasing the length of the regions of linear growth of disturbances and the laminar flow regime. In
this case, the low-frequency spectrum of vortex modes can be filled owing to nonlinear processes that occur in vortex triplets. |
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