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- W2153186579 abstract "The stabilization effect of porous coating on hypersonic boundary-layer flows has been studied by theoretical analyses, experiments, and numerical simulations. However, most of the previous work considered either felt-metal porous coating or regular porous coating. Comparison of the two types of porous coatings was only done in experiments. In this paper, mode S growth over felt-metal and regular porous coatings of a Mach 5.92 flow is obtained by numerical simulations to study the effect of different porous coatings. The results show that the two types of porous coatings both destabilize mode S in Mack’s first mode region. When mode S propagates into Mack’s second mode region, porous coatings initially stabilize it before destabilizing it further downstream. At approximately the same porosity, regular porous coating is weaker in first mode destabilization, initial second mode stabilization, and downstream second mode destabilization. In addition, the wall-normal velocity disturbance induced by regular porous coating is significantly weaker than that induced by felt-metal porous coating. For regular porous coating, decreasing of porosity leads to even weaker first mode destabilization, initial second mode stabilization, downstream second mode destabilization, and wall-normal velocity disturbance on the surface. Further studies are needed for the exact mechanism behind the complex effect of porous coating on mode S in Mack’s second mode region." @default.
- W2153186579 created "2016-06-24" @default.
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- W2153186579 date "2011-01-04" @default.
- W2153186579 modified "2023-09-23" @default.
- W2153186579 title "Numerical Simulations on mode S growth over feltmetal and regular porous coatings of a Mach 5.92 flow" @default.
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- W2153186579 doi "https://doi.org/10.2514/6.2011-375" @default.
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