On the development of a new nonequilibrium chemistry model for mars entry

R. L. Jaffe, D. W. Schwenke, G. M. Chaban, D. K. Prabhu, C. O. Johnston, M. Panesi

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


This paper represents a summary of results to date of an on-going effort at NASA Ames Research Center to develop a physics-based non-equilibrium model for hypersonic entry into the Martian atmosphere. Our approach for the determination of reaction rate coefficients is to first compute potential energy surfaces based on accurate solutions of the electronic Schrödinger equation and then use quasiclassical trajectory calculations to obtain reaction cross sections and rate coefficients based on these potentials. We have presented new rate coefficients for N2 dissociation and CO dissociation and exchange reactions. These results illustrate shortcomings with some of the rate coefficients in Park’s original T-Tv model for Mars entries and with some of the 30-45 year old shock tube data. We observe that the shock tube experiments of CO + O dissociation did not adequately account for the exchange reaction that leads to formation of C + O2. This reaction is actually the primary channel for CO removal in the shock layer at temperatures below 10,000 K, because the reaction enthalpy for exchange is considerably lower than the comparable value for dissociation. The rate coefficients reported herein should reduce the uncertainty in modeling hypersonic flows expected for entry of heavy spacecraft into the Martian atmosphere.

Original languageEnglish (US)
Title of host publicationAIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Electronic)9781624104473
StatePublished - 2017
Event55th AIAA Aerospace Sciences Meeting - Grapevine, United States
Duration: Jan 9 2017Jan 13 2017

Publication series

NameAIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting


Other55th AIAA Aerospace Sciences Meeting
Country/TerritoryUnited States

ASJC Scopus subject areas

  • Aerospace Engineering


Dive into the research topics of 'On the development of a new nonequilibrium chemistry model for mars entry'. Together they form a unique fingerprint.

Cite this