Computational model of collisional-radiative nonequilibrium plasma in an air-driven type laser propulsion

Yousuke Ogino, Naofumi Ohnishi

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

Abstract

A thrust power of a gas-driven laser-propulsion system is obtained through interaction with a propellant gas heated by a laser energy. Therefore, understanding the nonequilibrium nature of laser-produced plasma is essential for increasing available thrust force and for improving energy conversion efficiency from a laser to a propellant gas. In this work, a time-dependent collisional-radiative model for air plasma has been developed to study the effects of nonequilibrium atomic and molecular processes on population densities for an air-driven type laser propulsion. 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 unsteady nature of pulsively heated air plasma. When the ionization relaxation time is the same order as the time scale of a heating pulse, the effects of unsteady ionization are important for estimating air plasma states. From parametric computations, we determine the appropriate conditions for the collisional-radiative steady state, local thermodynamic equilibrium, and corona equilibrium models in that density and temperature range.

Original languageEnglish
Title of host publicationBeamed Energy Propulsion - Sixth International Symposium on Beamed Energy Propulsion
Pages148-159
Number of pages12
DOIs
Publication statusPublished - 2010 Aug 12
Event6th International Symposium on Beamed Energy Propulsion - Scottsdale, AZ, United States
Duration: 2009 Nov 122009 Nov 15

Publication series

NameAIP Conference Proceedings
Volume1230
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

Other6th International Symposium on Beamed Energy Propulsion
CountryUnited States
CityScottsdale, AZ
Period09/11/1209/11/15

Keywords

  • Collisional-radiative model
  • Nonequilibrium air plasma
  • Reactive and radiative flow

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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