Numerical Analysis of Porous Coatings Stabilizing Capabilities on Hypersonic Boundary-Layer Transition
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A high-order spectral difference flow solver is used to perform direct numerical simulations (DNS) of a hypersonic laminar boundary layer on an ultrasonically absorptive coating (UAC), in order to analyze the stabilizing effects of such a material on the laminar-turbulent transition. The UAC is modeled in the simulations by a time-domain impedance boundary condition, which is calibrated to replicate the acoustic response of the UAC over a broad spectral range. The frequency-dependence damping effectiveness is investigated, as are any other side effects the porous coating might have on the mean flow. It is found that the second-mode instability, which dominates the high-Mach number flow regime, is strongly suppressed for all excitation frequencies considered. The DNS solutions are also found to compare favorably with linearized stability theory. Finally, a side effect of theUACis the modification of the medium dispersive properties and the change of the perturbation group velocity.
Originalsprog | Engelsk |
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Tidsskrift | AIAA Journal |
Vol/bind | 59 |
Udgave nummer | 10 |
Sider (fra-til) | 3845-3858 |
Antal sider | 14 |
ISSN | 0001-1452 |
DOI | |
Status | Udgivet - okt. 2021 |
ID: 289456931