The mechanism of CO 2 dissociation during entry in the Mars atmosphere is experimentally investigated. A hydrogen–oxygen combustion-driven shock tube is used to simulate physical and chemical conditions in a CO 2 N 2 mixture. Two shock velocity/initial pressure conditions are studied: 7.09 ± 0.05    km / s at 100 Pa (called the low-pressure condition) and 5.68 ± 0.07    km / s at 300 Pa (called the high-pressure condition). The temperature behind the shock wave is obtained by analyzing the high-temporal-resolution and high-spatial-resolution experimental spectra of the CN violet ( B 2 Σ + X 2 Σ + , Δ v = 0 ) system. The CO number density is derived using a tunable diode laser absorption spectroscopy system based on CO absorption near 2.33    μ m . Moreover, a numerical code is developed to reproduce the experimental results (temperatures and species densities). The kinetic code in this work is based on Park’s two-temperature model. Comparisons between experiments and calculations are presented. Such a relatively simple two-temperature model fails to accurately describe the nonequilibrium temperature and CO number density but is suitable for equilibrium temperature predictions.


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    Titel :

    Experimental and Numerical Study of Carbon-Dioxide Dissociation for Mars Atmospheric Entry


    Beteiligte:
    Lin, X. (Autor:in) / Chen, L. Z. (Autor:in) / Li, J. P. (Autor:in) / Li, F. (Autor:in) / Yu, X. L. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2017-11-16


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




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