Abstract
The hypersonic boundary-layer transition is affected crucially by surface imperfections such as heating or cooling sources. In order to quantify this effect we develop an asymptotic theory, which not only reveals the interaction mechanism between oncoming instability modes and surface heating/cooling strips, but also provides quantitatively the change of the transition onset due to the scattering effect. The asymptotic predictions agree favorably with harmonic linearized Navier-Stokes calculations and direct numerical simulations.
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