Comparison of Titan entry radiation shock-tube data with collisional-radiative models

Brandis, Aaron M., Laux, Christophe O., Magin, Thierry, McIntyre, Timothy J. and Morgan, Richard G. (2014). Comparison of Titan entry radiation shock-tube data with collisional-radiative models. In: 40th AIAA Thermophysics Conference, Seattle, WA United States, (32-38). 23 - 26 June 2008. doi:10.2514/1.T4231


Author Brandis, Aaron M.
Laux, Christophe O.
Magin, Thierry
McIntyre, Timothy J.
Morgan, Richard G.
Title of paper Comparison of Titan entry radiation shock-tube data with collisional-radiative models
Conference name 40th AIAA Thermophysics Conference
Conference location Seattle, WA United States
Conference dates 23 - 26 June 2008
Journal name Journal of Thermophysics and Heat Transfer   Check publisher's open access policy
Place of Publication Reston, VA United States
Publisher American Institute of Aeronautics and Astronautics, Inc.
Publication Year 2014
Year available 2013
Sub-type Fully published paper
DOI 10.2514/1.T4231
Open Access Status
ISSN 0887-8722
1533-6808
Volume 28
Issue 1
Start page 32
End page 38
Total pages 7
Collection year 2014
Language eng
Abstract/Summary Radiation during Titan entryis importantatlower speeds (around 5-6 km/s) compared to other planetary entries due to the superequilibrium formation of the highly radiating species, cyanogen, in the shock layer (with concentrations beingup to50% higher than equilibrium).A collisional-radiative model has been developed to predict the nonequilibrium populations of cyanogen and nitrogen and the subsequent radiation emitted during entry into the Titan atmosphere. A vibration state specific model based on Schwartz-Slawsky-Herzfield theory, which includes excitation and deexcitation reactions for 47 vibration states of the ground electronic state of nitrogen, was incorporated into a previously developed collisional-radiative code. The model has been tested against measurements obtained with the Electric Arc Shock Tube at the NASA Ames Research Center and the X2 shock tube at the Universityof Queensland. The vibrationally specific nitrogen collisional-radiative simulations show better agreement with experimental dataintermsofthe initialriseofthe radiation, however, generallydonot offer improvedagreement in terms of the absolute intensity level. The results from this paper indicate that the collisional-radiative models overestimate the level of radiation by approximately a factor of 1.5-10, depending on the condition. Furthermore, results presented in this paper show that, by adjusting the excitation rate of cyanogen and dissociation of rate of nitrogen, good agreement between experiment and simulation can be obtained. Copyright
Subjects 3104 Condensed Matter Physics
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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