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.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Impact of the Ionization Reaction Set in Nonequilibrium Hypersonic Air Flows


    Contributors:

    Published in:

    AIAA Journal ; 58 , 3 ; 1255-1265


    Publication date :

    2019-10-31


    Size :

    11 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English





    Nonequilibrium hypersonic flows over corners

    PANDOLFI, MAURIZIO / ARINA, RENZO / BOTTA, NICOLA | AIAA | 1991


    Nonequilibrium hypersonic inviscid steady flows

    VALORANI, M. / ONOFRI, M. / FAVINI, B. et al. | AIAA | 1992


    Modeling of Electron Impact Ionization for Hypersonic Nonequilibrium Simulations

    Hao, Jiaao / Wang, Jingying / Lee, Chunhian | AIAA | 2017


    Nonequilibrium effects for hypersonic transitional flows

    MOSS, JAMES / SIMMONDS, ANN | AIAA | 1987