Numerical study on air plasma flowfield coupled with transition rate equations

Yousuke Ogino, Naofumi Ohnishi

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


A collisional-radiative rate equation coupled with energy equations has been developed to study the effects of nonequilibrium atomic and molecular processes on the population densities in an air plasma flowfield. This model consists of fifteen air species: e-, N, N+, N2+, O, O+, O2+, O-, N2, N+ 2, NO, NO+, O2, O+ 2, and O-2 with their major electronic excited states. Many elementary processes are considered in the number density range of 1012/cm3 ≤ N ≤ 1019/cm3 and the temperature range of 300 K ≤ T ≤ 40,000 K. We then compute the time evolution of chemical composition and temperature in a high enthalpy flow condition assuming the Fire II reentry problem. From comparison with an existing collisional-radiative code, we have confirmed that the molecular dissociation rates and thermal relaxation time should be determined by a suitable physical model to describe the plasma state achieved in the ionization phase by shock heating.

Original languageEnglish
Title of host publication42nd AIAA Thermophysics Conference
Publication statusPublished - 2011 Dec 1
Event42nd AIAA Thermophysics Conference 2011 - Honolulu, HI, United States
Duration: 2011 Jun 272011 Jun 30

Publication series

Name42nd AIAA Thermophysics Conference


Other42nd AIAA Thermophysics Conference 2011
Country/TerritoryUnited States
CityHonolulu, HI

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering
  • Condensed Matter Physics


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