Abstract
The laminar-turbulent transition in hypersonic flows is associated with the acoustic-wave-like Mack second mode. Understanding the physics and suppression of this mode is not only of basic scientific interest, but is also essential to future high-speed transportation. This study reveals that, counterintuitively, an almost nondissipative boundary with near-zero surface acoustic impedance can suppress this mode, and performs even better than conventional dissipation-based ultrasonic absorptive coatings. A practical realization, based on an acoustic metasurface, is furthermore presented, pointing toward full control of the hypersonic boundary-layer transition. Full speed ahead!
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