A test series was performed in the Electric Arc Shock Tube (EAST) facility with the aim of reproducing flight conditions encountered during the Mars 2020 mission entry into the Mars atmosphere. For this test series, the EAST facility was instrumented with two spectrometers for optical emission spectroscopy (OES) measurements and three mid-infrared lasers for tunable diode laser absorption spectroscopy (TDLAS). This paper focuses on the spectrally and spatially resolved radiance measured with OES. Conditions were chosen to achieve similarity to backshell radiative heating measured with the MEDLI2 heat flux gauges near and after the time of peak heating. Comparisons were made against two candidate kinetic models for Mars entry. Below 2.7    km / s , the chemistry is effectively frozen, with measurements being above both models and CEA predictions. It is shown that taking into account shock deceleration in the tube explains most of the discrepancy between measured and frozen radiance. For velocities above 2.7    km / s , the data lies between the two models. However, adjusting for shock deceleration indicates that one of the models may be preferred for predicting CO 2 dissociation. Finally, comparisons between OES and TDLAS data are made and show a good agreement on the measured temperature and CO 2 number density profiles, typically within 10 and 5%, respectively. A good agreement is also observed for the radiance that would be inferred based upon the quantities measured by TDLAS.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Reconstruction of Mars 2020 Backshell Radiative Heating via Infrared Emission Spectroscopy of CO2/N2/Ar Shockwaves



    Published in:

    Publication date :

    2024-10-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Backshell Radiative Heating on Human-Scale Mars Entry Vehicles

    West,Thomas K., IV / Theisinger, John E. / Brune, Andrew J. et al. | NTRS | 2017


    Backshell Radiative Heating on Human-Scale Mars Entry Vehicles

    West, Thomas K. / Theisinger, John / Brune, Andrew J. et al. | AIAA | 2017


    Backshell Radiative Heating on Human-Scale Mars Entry Vehicles (AIAA 2017-4532)

    West, Thomas K. / Theisinger, John / Brune, Andrew J. et al. | British Library Conference Proceedings | 2017


    Base Drag Model Derived from Mars 2020 Backshell Pressure Measurements

    Karlgaard, Christopher D. / Schoenenberger, Mark / Van Norman, John W. | AIAA | 2023


    ENERGY ABSORBING BACKSHELL

    NATSUME NORIKAZU / CONBOY STEVEN / DINGANKAR NILESH et al. | European Patent Office | 2018

    Free access