Calculation of Nonequilibrium Radiation from a Blunt-Body Shock Layer

Takeharu Sakai, Keisuke Sawada

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A numerical method is developed for calculating the radiating axisymmetric flowfield accounting for nonequilibrium thermochemistry. Solutions of the flow with radiation are obtained in a fully coupled manner using a fully implicit time-marching method through a full block-matrix inversion. The method is used in calculating the radiation from the blunt-body shock layer in both air and carbon-containing airflows. The calculated results are compared with the experimental data obtained in a ballistic range at flight speeds of up to 13.4 km/s. For aluminum models, which do not ablate, the experimentally observed spectral features are qualitatively reproduced by the calculation, which assumes the shock layer to contain only the air species. For polycarbonate models, which ablate, additionally carbonaceous species must be included in the calculation in order to bring about qualitative agreement. Quantitative agreement is obtained for the ablating models only by accounting additionally for a blackbody radiation, produced possibly by spalled carbon particles.

Original languageEnglish
Pages (from-to)99-105
Number of pages7
JournalJournal of thermophysics and heat transfer
Volume15
Issue number1
DOIs
Publication statusPublished - 2001

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Aerospace Engineering
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes
  • Space and Planetary Science

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