A mid-infrared laser absorption diagnostic was deployed to examine the evolution of thermophysical properties across a simulated Mars2020 shock layer in the Electric Arc Shock Tube (EAST) facility at NASA Ames. Rapid laser tuning techniques using bias-tee circuitry enabled quantitative temperature and number density measurements of CO 2 and CO with microsecond resolution over a shock velocity range of 1.30–3.75 km/s. Two interband cascade lasers were utilized at 4.17 and 4.19 μm to resolve rovibrational CO 2 lines spanning across J = 58 to J = 140 in the asymmetric stretch fundamental bands. In test cases with enough energy to dissociate CO 2 , a quantum cascade laser scanned multiple transitions of the CO fundamental bands near 4.98    μ m . The results are compared to the Data Parallel Line Relaxation (DPLR) code and Lagrange shock tube analysis (LASTA) simulations of the shock layer. A numerical simulation of the compressible boundary layer is used to account for measurement sensitivities to this flow feature in the EAST facility. Temperature and species transients are compared to multiple chemical kinetic models. The laser absorption data presented in this work can be used to refine the models used to simulate the aerothermal environment encountered during Mars entry.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Mars2020 Entry Shock Layer Thermochemical Kinetics Examined by Megahertz-Rate Laser Absorption Spectroscopy



    Erschienen in:

    Erscheinungsdatum :

    2023-11-06


    Format / Umfang :

    16 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    Carbon Monoxide Dissociation at Planetary Entry Conditions Examined by Megahertz-Rate Laser Spectroscopy

    Minesi, Nicolas Q. / Lai, Lok H. / Richmond, Miles O. et al. | AIAA | 2024


    Examination of Mars2020 Shock-Layer Conditions Via Infrared Laser Absorption Spectroscopy of CO2 and CO

    Jelloian, Christopher / Minesi, Nicolas / Spearrin, Raymond M. et al. | TIBKAT | 2023


    Examination of Mars2020 Shock-Layer Conditions Via Infrared Emission Spectroscopy of CO2

    Tibère-Inglesse, Augustin C. / Cruden, Brett A. / Jelloian, Christopher et al. | TIBKAT | 2023


    MBSE for Mars2020

    Fosse, Elyse | NTRS | 2021


    Examination of Mars2020 shock-layer conditions via infrared emission spectroscopy of CO2

    Tibère-Inglesse, Augustin C. / Cruden, Brett A. / Jelloian, Christopher et al. | AIAA | 2023