Nonequilibrium radiation intensity measurements in simulated Titan atmospheres

Brandis, Aaron M., Morgan, Richard G., McIntyre, Tim and Jacobs, Peter A. (2010) Nonequilibrium radiation intensity measurements in simulated Titan atmospheres. Journal of Thermophysics and Heat Transfer, 24 2: 291-300. doi:10.2514/1.44482

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Author Brandis, Aaron M.
Morgan, Richard G.
McIntyre, Tim
Jacobs, Peter A.
Title Nonequilibrium radiation intensity measurements in simulated Titan atmospheres
Journal name Journal of Thermophysics and Heat Transfer   Check publisher's open access policy
ISSN 0887-8722
Publication date 2010-04
Year available 2008
Sub-type Article (original research)
DOI 10.2514/1.44482
Volume 24
Issue 2
Start page 291
End page 300
Total pages 10
Editor Alfred L. Crosbie
Place of publication Reston, VA, U.S.A.
Publisher American Institute of Aeronautics and Astronautics
Collection year 2011
Language eng
Subject 0901 Aerospace Engineering
0913 Mechanical Engineering
0105 Mathematical Physics
Formatted abstract
This paper details the experimental work conducted at the University of Queensland to measure the nonequilibrium radiation intensity behind a shock in simulated Titan atmospheres, as would be seen during planetary entry. Radiation during Titan entry is more important at lower speeds (about 5–6 km=s) than other planetary entries due to the formation of cyanogen in above equilibrium concentrations in the shock layer, which is a highly radiative species. The experiments were focused on measuring the nonequilibrium radiation emitted from cyanogen between the wavelength range of 310–450 nm. This paper includes experimental results for radiation and spectra found in the postshock region of the flow. Experiments have been conducted at various ambient pressures, shock speeds, and chemical compositions. This leads to a comprehensive benchmark data set for Titan entry, which will be useful for validation of theoretical models. Spectra were recorded at various axial locations behind the shock, enabling the construction of radiation profiles for Titan entry. Furthermore, wavelength profiles can also be constructed to identify various radiating species, in this case, predominately cyanogen violet. Furthermore, this paper includes comparisons with experiments performed at NASA Ames Research Center on their electric arc-driven shock tube in Titan compositions. Excellent quantitative agreement has been obtained between the two facilities.
Copyright © 2009 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
Keyword Titan
Nonequilibrium radiation intensity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published APR-JUN 2010. First presented as Paper 4136 at the 26th AIAA Aerodynamic Measurement Technology and Ground Testing Conference, Seattle WA U.S.A., 23–26 June 2008; and published in those Proceedings (ISBN 1605603686; 9781605603681).

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Created: Wed, 17 Feb 2010, 12:09:58 EST by Michael Affleck on behalf of School of Mechanical and Mining Engineering