| Grant number: | 14/25438-1 |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| Start date: | January 01, 2015 |
| End date: | December 31, 2016 |
| Field of knowledge: | Engineering - Aerospace Engineering - Aerodynamics |
| Principal Investigator: | João Luiz Filgueiras de Azevedo |
| Grantee: | Rodrigo Cassineli Palharini |
| Host Institution: | Instituto de Aeronáutica e Espaço (IAE). Departamento de Ciência e Tecnologia Aeroespacial (DCTA). Ministério da Defesa (Brasil). São José dos Campos , SP, Brazil |
| Associated research grant: | 13/07375-0 - CeMEAI - Center for Mathematical Sciences Applied to Industry, AP.CEPID |
Abstract Analysis of hypersonic rarefied flows is essential to the study of re-entry mechanics of space vehicles. During re-entry of a reusable space vehicle in the upper atmosphere, a shock wave forms in front of the spacecraft and leads to a very high translational, rotational, and vibrational temperatures in the flowfield. A large amount of nitrogen and oxygen molecules are dissociated under these conditions and considerable amount of O and N atoms generated in the dissociation reactions strike directly the vehicle surface producing a large amount of heat. Furthermore, the risk due to an inadequate knowledge of real gas effects is that the integrity and performance of the vehicle may be severely compromised because of wrong design choices as, for example, additional weight for the thermal protection system.In this scenario, the purpose of this investigation is to shed light on the role of thermochemical non-equilibrium in rarefied hypersonic flows around the SARA (acronym for Satélite Recuperável Atmosférico) capsule, which has been under development by Instituto de Aeronáutica e Espaço, at Departamento de Ciência e Tecnologia Aeroespacial (DCTA). This research project focus on the impact of chemical reactions on the flowfield structure and aerodynamic properties during different phases of the SARA re-entry trajectory, using both the direct simulation Monte Carlo method and continuum formulations, depending on the flight condition. In addition, simulations will be performed in a full 3-D geometry taking into account the wake region formed downstream of the vehicle, different angles of attack and gas surface interactions. It is important to mention that, for the particular case of SARA, this is the first work to address a complete investigation of a Brazilian space vehicle in the transition flow regime under thermochemical non-equilibrium conditions. | |
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