Nonequilibrium infrared emission spectra representative of a Mars atmospheric entry mission are modeled using RADIS, a spectral code for CO and CO 2 based on the HITEMP-2010 and CDSD-4000 databases. The modeled experimental data for the free-flow and the forebody radiation were obtained in the JAXA expansion tube facility. In the expanding flow, good agreement with the experimental data can be obtained using a slightly nonequilibrium distribution and a homogeneous flow. The model suggests that all three CO 2 vibration modes share a same vibrational temperature slightly higher than the gas temperature. In the shock layer, the forebody radiation includes both CO 2 and CO emission features. It can be correctly predicted by assuming thermal and chemical equilibrium at 4000 ± 500    K .


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    Title :

    Analysis of the JAXA Nonequilibrium Infrared Emission Spectra for Mars Entry Conditions


    Contributors:

    Published in:

    Publication date :

    2019-05-28


    Size :

    5 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





    JAXA

    Uchū-Kōkū-Kenkyū-Kaihatsu-Kikō | TIBKAT | 2003-2005 ; damit Erscheinen eingestellt


    Investigation of Nonequilibrium Radiation for Mars Entry

    Brandis, Aaron / Johnston, Christopher / Panesi, Marco et al. | AIAA | 2013


    Investigation of Nonequilibrium Radiation for Mars Entry

    Brandis, A. / Johnston, C. / Cruden, B. et al. | British Library Conference Proceedings | 2013