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

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31st International Symposium on Shock Waves 2 (ISSW 2017)

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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.

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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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Authors and Affiliations

  1. JAXA, Chofu Aerospace Centre, Tokyo, Japan

    A. Lemal, S. Matsuyama, S. Nomura, H. Takayanagi & K. Fujita

Authors
  1. A. Lemal
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  2. S. Matsuyama
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  3. S. Nomura
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  4. H. Takayanagi
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  5. K. Fujita
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Corresponding author

Correspondence to A. Lemal .

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Editors and Affiliations

  1. Department of Aerospace Engineering, Nagoya University, Nagoya, Japan

    Akihiro Sasoh

  2. Department of Energy and Environmental Engineering, Kyushu University, Kasuga, Fukuoka, Japan

    Toshiyuki Aoki

  3. Institute of Innovative Research, Tokyo Institute of Technology, Tokyo, Japan

    Masahide Katayama

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Lemal, A., Matsuyama, S., Nomura, S., Takayanagi, H., Fujita, K. (2019). Calculation of Intensity Profiles Behind a Shock Wave Traveling in Air at Speeds Exceeding 12 km/s. In: Sasoh, A., Aoki, T., Katayama, M. (eds) 31st International Symposium on Shock Waves 2. ISSW 2017. Springer, Cham. https://doi.org/10.1007/978-3-319-91017-8_38

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  • DOI: https://doi.org/10.1007/978-3-319-91017-8_38

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-91016-1

  • Online ISBN: 978-3-319-91017-8

  • eBook Packages: EngineeringEngineering (R0)

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