| Texto completo | |
| Autor(es): |
Santos, Wilson F. N.
[1]
Número total de Autores: 1
|
| Afiliação do(s) autor(es): | [1] Natl Inst Space Res, Combust & Prop Lab, BR-12630000 Sao Paulo - Brazil
Número total de Afiliações: 1
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Brazilian Journal of Physics; v. 42, n. 5-6, p. 373-390, DEC 2012. |
| Citações Web of Science: | 3 |
| Resumo | |
This work deals with a computational investigation on the small ballistic reentry Brazilian vehicle SAt,lite de Reentrada Atmosf,rica (SARA). Hypersonic flows over the vehicle SARA at zero-degree angle of attack in chemical equilibrium and thermal nonequilibrium are modeled by the direct simulation Monte Carlo method, which has become the main technique for studying complex multidimensional rarefied flows, and which properly accounts for the nonequilibrium aspects of the flows. The emphasis of this paper is to examine the behavior of the primary properties during the high-altitude portion of SARA reentry. In this way, velocity, density, pressure, and temperature field are investigated for altitudes of 100, 95, 90, 85, and 80 km. In addition, comparisons based on geometry are made between axisymmetric and planar two-dimensional configurations. Some significant differences between these configurations were noted on the flowfield structure in the reentry trajectory. The analysis showed that the flow disturbances have different influence on velocity, density, pressure, and temperature along the stagnation streamline ahead of the capsule nose. It was found that the stagnation region is a thermally stressed zone. It was also found that the stagnation region is a zone of strong compression, high wall pressure. Wall pressure distributions are compared with those of available experimental data, and good agreement is found along the spherical nose for the altitude range investigated. (AU) | |
| Processo FAPESP: | 08/03878-9 - Análise computacional da aerotermodinâmica de um satélite recuperável na reentrada atmosférica |
| Beneficiário: | Wilson Fernando Nogueira dos Santos |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |