Abstract
Shock-tube experiments are carried out to study the radiation emitted during a vehicle entry in the Mars atmosphere. CN and C 2 emission absolute intensity measurements are performed behind a strong shock wave in a CO-N 2 mixture with two different conditions of initial pressure and velocity. The CN violet system bands are shown to be self-absorbed. Temperatures and CN mole fractions are derived using this phenomenon in the nonequilibrium part of the shocked gas. C 2 absolute emission intensities are measured in different mixtures: CO-N 2 , CO 2 -N 2 , and pure CO 2 . Some comparisons with two-temperature calculations are presented. Such a two-temperature model fails to correctly reproduce CN and C 2 experimental radiative flux densities but is suitable for mole fraction predictions.
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