Comparison of Titan Entry Radiation Shock-Tube Data with Collisional-Radiative Models

Sie sind hier: Homepage > Suche

Comparison of Titan Entry Radiation Shock-Tube Data with Collisional-Radiative Models

Brandis, Aaron M. / Laux, Christophe O. / Magin, Thierry / McIntyre, Timothy J. / Morgan, Richard G.

Radiation during Titan entry is important at lower 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 being up to 50% 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 University of Queensland. The vibrationally specific nitrogen collisional-radiative simulations show better agreement with experimental data in terms of the initial rise of the radiation, however, generally do not offer improved agreement 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.

Zugriff

Zugriff prüfen

Verfügbarkeit in meiner Bibliothek prüfen

Bestellung bei Subito €

Exportieren, teilen und zitieren

Dokumentinformationen

Titel :

Comparison of Titan Entry Radiation Shock-Tube Data with Collisional-Radiative Models

Beteiligte:

Brandis, Aaron M. (Autor:in) / Laux, Christophe O. (Autor:in) / Magin, Thierry (Autor:in) / McIntyre, Timothy J. (Autor:in) / Morgan, Richard G. (Autor:in)

Erschienen in:

Journal of Thermophysics and Heat Transfer ; 28 , 1 ; 32-38

Erscheinungsdatum :

2014-01-13

Format / Umfang :

7 pages

ISSN :

0887-8722 , 1533-6808

DOI :

https://doi.org/10.2514/1.T4231

Medientyp :

Aufsatz (Zeitschrift)