Stabilization of the Mack second mode is of great significance to control hypersonic boundary-layer transitions. Based on the generalized Snell’s law, this work proposes a reflection-controlled metasurface that can restrain the Mack second mode instability by controlling the reflection directions of disturbance waves and consequently stabilize hypersonic boundary-layer flow. The metasurface is periodically corrugated with subwavelength groove groups: each of which is composed of several grooves with different depths. The direct numerical simulation results of a Mach 6 flat-plate boundary layer indicate that the reflection-controlled metasurfaces divide the “two-cell” structure of the Mack second mode into several small parts, and that largely inhibits the growth of the Mack second mode.
Control of Reflected Waves with Acoustic Metasurfaces for Hypersonic Boundary-Layer Stabilization
AIAA Journal ; 59 , 6 ; 1893-1898
2021-04-27
6 pages
Article (Journal)
Electronic Resource
English
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