TY - GEN
T1 - Comparison of physical models in computations of high-enthalpy double-cone flows
AU - Druguet, Marie Claude
AU - Candler, Graham V.
AU - Nompelis, Ioannis
PY - 2006
Y1 - 2006
N2 - The results of a systematic comparison of physical models used in the Navier-Stokes computations of high-enthalpy flows over a double cone are presented. The simulations employ various models for the forward reaction rates, the equilibrium constants, the vibrational energy relaxation and the transport coefficients. The comparison of models for transport coefficients shows that their influence on the flow past the double cone is limited and that among all models the Gupta-Yos model for both the viscosity and the thermal conductivity of the mixture gives the best results. This study also shows that all the forward rate constants (Evans, Camac, Gardiner, Park'1985, Park'1990) that are compared in this work produce very similar flowflelds and surface quantities. Similarly, all the equilibrium constant models compared in this work (Park'1985, Park'1990, and the model based on chemical potentials) give the same results. However, none of the results obtained with these various standard models agrees well with the experimental data, unless the chemical rates are artificially tinkered. Therefore, the reason for the discrepancies observed must be linked to the freest ream conditions.
AB - The results of a systematic comparison of physical models used in the Navier-Stokes computations of high-enthalpy flows over a double cone are presented. The simulations employ various models for the forward reaction rates, the equilibrium constants, the vibrational energy relaxation and the transport coefficients. The comparison of models for transport coefficients shows that their influence on the flow past the double cone is limited and that among all models the Gupta-Yos model for both the viscosity and the thermal conductivity of the mixture gives the best results. This study also shows that all the forward rate constants (Evans, Camac, Gardiner, Park'1985, Park'1990) that are compared in this work produce very similar flowflelds and surface quantities. Similarly, all the equilibrium constant models compared in this work (Park'1985, Park'1990, and the model based on chemical potentials) give the same results. However, none of the results obtained with these various standard models agrees well with the experimental data, unless the chemical rates are artificially tinkered. Therefore, the reason for the discrepancies observed must be linked to the freest ream conditions.
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U2 - 10.2514/6.2006-3419
DO - 10.2514/6.2006-3419
M3 - Conference contribution
AN - SCOPUS:33845516841
SN - 1563478153
SN - 9781563478154
T3 - Collection of Technical Papers - 9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference Proceedings
SP - 1575
EP - 1587
BT - Collection of Technical Papers - 9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference Proceedings
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - 9th AIAA/ASME Joint Thermophysics and Heat Transfer Conference Proceedings
Y2 - 5 June 2006 through 8 June 2006
ER -