The impact of the gas-phase ionization on flow and surface properties at nonequilibrium hypersonic conditions is examined with the direct simulation Monte Carlo method for five-, seven-, and 11-species air models. The freestream velocity is varied from 6 to 9    km / s , and the Knudsen number is varied from 0.0003 to 0.0012. Validation is conducted for a normal shock wave and Radio Attenuation Measurement C Band (RAM-C) sphere–cone configuration. The model analysis is performed for a RAM-C forebody. Ionization is shown to noticeably change flow properties inside the shock at velocities of 9    km / s and higher, as well as in the boundary layer at velocities of 8    km / s and higher. The seven-species model is generally applicable up to 8    km / s . For higher velocities, it differs significantly from the 11-species model, especially inside the boundary layer; and it underpredicts the heat flux reduction due to ionization by a factor of two. Compared to the five-species model, the maximum change in the heat flux is 2% for the seven-species model and 4% for the 11-species model.


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    Titel :

    Impact of the Ionization Reaction Set in Nonequilibrium Hypersonic Air Flows


    Beteiligte:

    Erschienen in:

    AIAA Journal ; 58 , 3 ; 1255-1265


    Erscheinungsdatum :

    01.03.2020




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch





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