Analysis of nonequilibrium CN radiation encountered during titan atmospheric entry

Brandis, Aaron M., Morgan, Richard G. and McIntyre, Timothy J. (2011) Analysis of nonequilibrium CN radiation encountered during titan atmospheric entry. Journal of Thermophysics and Heat Transfer, 25 4: 493-499. doi:10.2514/1.50966

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Author Brandis, Aaron M.
Morgan, Richard G.
McIntyre, Timothy J.
Title Analysis of nonequilibrium CN radiation encountered during titan atmospheric entry
Journal name Journal of Thermophysics and Heat Transfer   Check publisher's open access policy
ISSN 0887-8722
1533-6808
Publication date 2011-10
Sub-type Article (original research)
DOI 10.2514/1.50966
Volume 25
Issue 4
Start page 493
End page 499
Total pages 7
Place of publication Reston, VA, United States
Publisher American Institute of Aeronautics and Astronautics
Collection year 2012
Language eng
Formatted abstract The focus of this paper is to analyze the Titan reaction scheme and determine the mechanisms that control the formation and decay of the radiation emitted by the cyanogen molecule (CN) during entry into Titan's atmosphere. Through a parametric study of important reactions combined with an investigation into reaction pathways, it has been concluded that the coupling between the dissociation of N2 and the formation of the CN (through the reaction N2 + C → CN + N) controls the radiation decay rate. The reason for the super equilibrium concentrations (approximately 50% higher than equilibrium) was identified to be a result of the N2 + C → CN + N reaction continuing to overproduce theCNafter nominal equilibrium values were reached. This is due to the slow buildup ofN to drive the reverse reaction. The absolute level of emitted radiation has been shown to be controlled by the lifetime of the CN state and the excitation of CN to CN by heavy particle impact. Thus, it is the conclusion of this paper that CN radiation is primarily controlled by N2 dissociation.
Keyword Evaluated Kinetic-Data
Propellant Combustion
Dissociation Rates
Excimer Photolysis
Pulsed Discharge
Shock-Tube
Data-Base
Atom
No
Spectroscopy
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2012 Collection
 
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