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Calculation of Intensity Profiles Behind a Shock Wave Traveling in Air at Speeds Exceeding 12 km/s

  • A. LemalEmail author
  • S. Matsuyama
  • S. Nomura
  • H. Takayanagi
  • K. Fujita
Conference paper

Abstract

This paper presents the recent efforts in computing the flow field and radiation behind a shock wave traveling in air at speeds exceeding 12 km/s to support the exploration mission currently considered at JAXA. The influence of the electron number density on the thermodynamic properties and ionization equilibrium constants was highlighted and quantified. The thermochemistry model in JAXA CFD code was upgraded and the flow field was computed. The populations of the excited states radiating in the vacuum ultraviolet (VUV) were computed with a collisional-radiative (CR) model. Subsequently, the radiative properties of the strongest radiators were computed with the models and database of JAXA spectral solver. The computed VUV post-shock intensity profiles were compared with shock-tube radiation measurements obtained in facilities operated at representative flight conditions. The influence of electron-impact excitation and radiative processes is discussed.

Notes

Acknowledgments

The authors are indebted to Dr. A. M. Brandis and Dr. B. A. Cruden (NASA Ames Research Center) for providing their shock-tube radiation measurements and the resolution functions. Experimental devices were provided by the Japan Society for the Promotion of Science (JSPS) under the grant Kaken-Hi 26289326 and were gratefully acknowledged. Computer resources were provided by JAXA Supercomputer Server (JSS) and were gratefully acknowledged. Thanks are due Mrs. S. Nishimura (graduate student at Shizuoka University) for operating JAXA HVST facility under a tight schedule.

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2019

Authors and Affiliations

  • A. Lemal
    • 1
    Email author
  • S. Matsuyama
    • 1
  • S. Nomura
    • 1
  • H. Takayanagi
    • 1
  • K. Fujita
    • 1
  1. 1.JAXA, Chofu Aerospace CentreTokyoJapan

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