Perspectives on the development of accurate non-equilibrium radiation models for planetary atmospheric entries

Details Perspectives on the development of accurate non-equilibrium radiation models for planetary atmospheric entries Perspectives on the development of accurate non-equilibrium radiation models for planetary atmospheric entries

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.583...23l&link_type=abstract

Proceedings of the International Workshop on Radiation of High Temperature Gases in Atmospheric Entry - Part II (ESA SP-583). 30

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This paper discusses the current perspectives for the development of state-to-state models for the simulation of nonequilibrium radiation in atmospheric entry flows. Nonequilibrium radiation depends mainly from the population of atomic and molecular excited electronic states. An accurate state-to-state model for the calculation of such excited states populations in such particular conditions needs therefore to be set-up. Some restrictions can be carried on such elaborate model. Using the weighted rate coefficient method, the overall model can be reduced in order to account solely for the interactions among different electronic levels. Also, a quasi-steady condition of the internal levels populations inside the flow is usually reached. Such restrictions lead to minor computation overheads of such models and allow considering their inclusion in a global fluid-dyanmics-radiative solver for the simulation of atmospheric entry flows. Validation requirements of such state-to-state models will be discussed, considering the different available ground-test facilities. Examples of the development and validation of a state-to-state model will be presented in the case of gas discharge applications.

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