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Article Dans Une Revue Journal of Thermophysics and Heat Transfer Année : 2019

Analysis of the JAXA Nonequilibrium Infrared Emission Spectra for Mars Entry Conditions

Résumé

Nonequilibrium infrared emission spectra representative of a Mars atmospheric entry mission are modeled using RADIS, a spectral code for CO and CO 2 based on the HITEMP-2010 and CDSD-4000 databases. The modeled experimental data for the free-flow and the forebody radiation were obtained in the JAXA expansion tube facility. In the expanding flow, good agreement with the experimental data can be obtained using a slightly nonequilibrium distribution and a homogeneous flow. The model suggests that all three CO 2 vibration modes share a same vibrational temperature slightly higher than the gas temperature. In the shock layer, the forebody radiation includes both CO 2 and CO emission features. It can be correctly predicted by assuming thermal and chemical equilibrium at 4000 ± 500 K. Nomenclature p = pressure [bar] T r ot = rotational temperature of the gas [K] T tr ans = translational temperature of the gas [K] T vib = vibrational temperature of the gas [K] T vib 1 , T vib 2 , T vib 3 = for CO 2 , temperature of each vibration mode: symmetric, bending and asymmetric vibration, respectively [K] x CO , x CO 2
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Dates et versions

hal-02471012 , version 1 (07-02-2020)

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Erwan Pannier, Christophe O. Laux. Analysis of the JAXA Nonequilibrium Infrared Emission Spectra for Mars Entry Conditions. Journal of Thermophysics and Heat Transfer, 2019, 33 (4), pp.1127-1131. ⟨10.2514/1.T5646⟩. ⟨hal-02471012⟩
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