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Strength and Frequency of Underwater Shock Waves Related to Sterilization Effects on a Marine Bacterium Read chapter Read first chapter

2019 | OriginalPaper | Chapter

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

Authors : A. Lemal, S. Matsuyama, S. Nomura, H. Takayanagi, K. Fujita

Published in: 31st International Symposium on Shock Waves 2

Publisher: Springer International Publishing

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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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previous chapter Driver Condition Development for High-Enthalpy Operation of the X3 Expansion Tube
next chapter Revisiting Temperature Measurements at the Focus of Spherically Converging Shocks in Argon
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Metadata
Title
Calculation of Intensity Profiles Behind a Shock Wave Traveling in Air at Speeds Exceeding 12 km/s
Authors
A. Lemal
S. Matsuyama
S. Nomura
H. Takayanagi
K. Fujita
Copyright Year
2019
Book
31st International Symposium on Shock Waves 2

Print ISBN: 978-3-319-91016-1

Electronic ISBN: 978-3-319-91017-8

Copyright Year: 2019

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

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