par Brandis, Aaron;Laux, Christophe;Magin, Thierry 
Référence 40th AIAA Thermophysics Conference(40: 2008), American Institute of Aeronautics and Astronautics
Publication Publié, 2008
Référence 40th AIAA Thermophysics Conference(40: 2008), American Institute of Aeronautics and Astronautics
Publication Publié, 2008
Publication dans des actes
| Résumé : | An update to a collisional-radiative model developed by Magin et al for Huygens Titan atmospheric entry is proposed. The model is designed to predict the nonequilibrium populations and the radiation emitted from cyanogen and nitrogen during the entry of the Huygens probe into the Titan atmosphere. Radiation during Titan entry is important at lower speeds (around 5 - 6 km/s) more so than other planetary entries due to the formation of cyanogen in the shock layer, which is a highly radiative species. The model has been tested against measurements obtained with the EAST shock tube of NASA Ames Research Centre. The motivation for the update is due to the large discrepancies shown in the post-shock fall-off rates of the radiation when compared to the experimental EAST shock tube test results. Modifications were made to the reaction rates used to calculate the species concentrations in the flow field. The reaction that was deemed most influential for the radiation fall off rate was the dissociation of molecular nitrogen. Therefore, a more comprehensive set of rates was used for this reaction as all the vibrational levels of nitrogen are included. The updated model shows significantly better agreement with the EAST data. |
