Grazing flow reduces net acoustic dissipation in liners by confining flow via a quasi-steady vortex, increasing low-SPL viscous losses, and making vortex shedding phase-dependent so it generates energy on outflow.
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Noise dissipation mechanisms of an acoustic liner under grazing flow
Grazing flow reduces net acoustic dissipation in liners by confining flow via a quasi-steady vortex, increasing low-SPL viscous losses, and making vortex shedding phase-dependent so it generates energy on outflow.