Simulations are performed in collaboration with inductively coupled plasma torch experiments to investigate gas-phase chemical kinetics in the boundary layer of a pyrolyzing ablator. A gas injection probe delivers CO 2 or H 2 into plasma mixtures of Ar / N 2 / O 2 , and emission spectroscopy provides absolute, spatially, and spectrally resolved measurements of the radiative emission in the boundary layer. A computational model of the plasma flow in the Inductively Coupled Plasma facility was used with finite rate chemistry mechanisms, and line-of-sight emission spectra were computed from the results to assess the accuracy of the chemistry mechanisms. The CO 2 –air and H 2 –air chemistries were examined, and CN emission levels were overpredicted by a factor of 3–4, whereas OH emission was underpredicted by a factor of 2. Sensitivity analyses show that uncertainty in the experimental temperature accounts for much of the discrepancy.


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    Title :

    Modeling of Emission Spectra in Nonequilibrium Plasmas for Testing Pyrolyzing Ablators


    Contributors:

    Published in:

    Publication date :

    2019-10-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Modeling of Gas-Phase Chemical Kinetics for Pyrolyzing Ablators

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    Investigation of Pyrolyzing Ablators Using a Gas Injection Probe

    Martin, Nicholas / Meyers, Jason M. / Fletcher, Douglas G. et al. | AIAA | 2017