Modeling of non-equilibrium radiation for CO2-N2 gas mixtures

Robyn Macdonald, Alessandro Munafò, Christopher O. Johnston, Marco Panesi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


This work addresses the study of the dynamics of the excited states of CO molecules in a shock heated CO2{N2 mixture, representative of the Mars atmosphere. A hybrid state-to-state (StS) model is considered as an alternative to the quasi-steady-state (QSS) approach for the modeling of non-equilibrium phenomena. These approaches are coupled with a non-equilibrium radiation solver, HPC-RAD, allowing for the calculation of the radiation signature due to the CO 4th positive system, which dominates the radiative heating on the forebody for Mars entries with velocities greater than 6 km/s. The high temperatures seen by the molecules in this mixture lead to significant excitation of CO molecules, contributing to a non-Boltzmann distribution of the internal states. The QSS approach predicts very different radiation properties than the StS approach because of the significant dissociation of the excited states, which are not properly accounted for in the QSS approach. It is shown that, using the same kinetic mechanism, the QSS approach predicts 50% lower radiative heating than the StS approach.

Original languageEnglish (US)
Title of host publication54th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Number of pages15
ISBN (Print)9781624103933
StatePublished - 2016
Event54th AIAA Aerospace Sciences Meeting, 2016 - San Diego, United States
Duration: Jan 4 2016Jan 8 2016

Publication series

Name54th AIAA Aerospace Sciences Meeting


Other54th AIAA Aerospace Sciences Meeting, 2016
Country/TerritoryUnited States
CitySan Diego

ASJC Scopus subject areas

  • Aerospace Engineering


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