The results from a set of vibrational nonequilibrium models with a range of fidelity are compared to the recent experimental data for several postnormal shock test cases. The present work focuses solely on oxygen flows with an emphasis on implementing a new set of accurate state-specific rate coefficients for O 2 O collisions. The two-temperature model is presented as the computationally efficient, lower-fidelity approach in this work. The two-temperature model is driven by the relaxation parameters based on the Millikan–White empirical equation as well as on the parameters resulting from a master equation simulation that employs the database of state-resolved O 2 O rate coefficients. The full state-to-state master equation approach is presented as the higher-fidelity modeling approach. The O 2 O system uses recently available results of trajectory simulations for state-specific transition rate coefficients The O 2 O 2 system uses transition rates from the forced harmonic oscillator model. The test case comparison shows that the state-resolved modeling approach is more suitable for describing the vibrational temperature and chemically nonequilibrium zone behind the shock wave. It is shown that the capability of the state-resolved model to capture non-Boltzmann distribution is critical for accurately modeling the vibrational relaxation and dissociation phase.


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    Title :

    Aerothermochemical Nonequilibrium Modeling for Oxygen Flows


    Contributors:

    Published in:

    Publication date :

    2017-01-31


    Size :

    12 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






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