Modeling and simulation of chemical reactions at the surface of an ablative wall interacting with a hypersonic flow
Résumé
T his paper focuses on the modeling and simulation of chemical reactions of oxidation, nitridation and sublimation at the surface of an ablative Thermal Protection System (TPS) interacting with a hypersonic flow of Earth's atmosphere. After a description of the chosen chemical models, models are described and validated on a simple test case using an uncoupled in-house software. Then, to simulate the interaction between the TPS and the hypersonic flow, three softwares developed at French aerospace research lab (ONERA) are used. To model the thermal degradation of TPSs' composite materials, the MoDeTheC solver, in which models of thermokinetic degradation and surface chemical reactions are implemented, is used. To model the hypersonic flow, the CEDRE platform and in particular the Navier-Stokes CHARME solver are used. To ensure coupling between the ablative TPS and the hypersonic flow, the coupling library CWIPI is used to interface MoDeTheC and CHARME. Finally, results obtained by coupling MoDeTheC and CHARME are analyzed and compared to reference data available in the literature for the experimental flight Radio Attenuation Measurements project C probe I (RAMC-I).
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