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ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
THE INFLUENCE OF GAS-SURFACE INTERACTION ON THE BRAZILIAN REENTRY SATELLITE AT RAREFIED CONDITIONS
Submission Author:
Rodrigo Palharini , SP
Co-Authors:
João Luiz F. Azevedo
Presenter: Rodrigo Palharini
doi://10.26678/ABCM.ENCIT2016.CIT2016-0178
Abstract
High speed vehicles flying thought Earth’s atmosphere are exposed to different flow regimes and a wide range of very complex phenomena. The presence of strong shock waves and chemical reactions are the main characteristics of such flight conditions and they directly affect the design and production of a reliable thermal protection system (TPS). In addition, as the reacting hypersonic flow moves around the spacecraft it tends to corrode (or smooth out) the TPS surface, rendering it more reflective to the impact of air molecules. These gas-surface interactions govern the transfer of momentum and energy from the gas to the solid surface and, hence, influence the heating rates and pressure loads acting on the vehicle surface. In this scenario, the main focus of the present investigation is the assessment of the impact of different gas-surface interaction models on the heat transfer, pressure and skin friction coefficients for the Brazilian Reentry Satellite (SARA) at 95 km altitude. At this altitude, conventional techniques based on continuum formulations are no longer valid and the direct simulation Monte Carlo (DSMC) method should be used to handle problems in the rarefied portion of Earth’s atmosphere.
Keywords
Atmospheric reentry, Rarefied flows, Chemical reactions, DSMC, Atmospheric reentry, Rarefied flows, Chemical reactions, DSMC
