Michele Capriati, Georgios Bellas Chatzigeorgis,Alessandro Turchi,Bernd Helber,Thierry E. Magin

DOI Number XXX-YYY-ZZZ

Conference Number HiSST-2022-305

The strong shock experienced by a spacecraft entering the atmosphere leads to the formation of a highly
reactive boundary layer that interacts with its surface through chemical reactions and heat exchange.
From a numerical prospective, these gas-surface interactions can be modeled as a boundary condition
that allows to compute macroscopic properties, such as temperature and recession rates. Mass and
energy conservation is imposed at the surface. In the present work, an ablative surface was numerically
simulated. Since a two-temperature model was employed to describe the flowfield, a surface vibrational
energy balance was derived. It was compared with two extreme cases: surface in thermal equilibrium
and surface vibrationally adiabatic. Results shows that considering surface vibrational energy relaxation
has an important impact on the surface temperature and on the recession rate. Furthermore, it suggests
a possible high internal excitation close to the surface.

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In Categories: 1.Events, HiSST 2022, Hypersonic Fundamentals and History
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