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Plasma radiation for atmospheric entry at Titan: Emission spectroscopy measurements and numerical rebuilding

Published online by Cambridge University Press:  21 January 2013

R. SOBBIA ,
P. LEYLAND ,
Y. BABOU ,
D. POTTER  and
L. MARRAFFA
R. SOBBIA
Affiliation:
Ecole Polytechnique Fédérale de Lausanne (EPFL), EPFL-GR-SCI-STI-IAG, Interdisciplinary Aerodynamics Group, Station 9, CH-1015 Lausanne, Switzerland (penelope.leyland@epfl.ch)
P. LEYLAND
Affiliation:
Ecole Polytechnique Fédérale de Lausanne (EPFL), EPFL-GR-SCI-STI-IAG, Interdisciplinary Aerodynamics Group, Station 9, CH-1015 Lausanne, Switzerland (penelope.leyland@epfl.ch)
Y. BABOU
Affiliation:
Aeronautics and Aerospace Department, von Karman Institute for Fluid Dynamics, Chaussée de Waterloo 72, 1640 Rhode-Saint-Genèse, Belgium
D. POTTER
Affiliation:
Centre for Hypersonics, University of Queensland, St Lucia QLD 4072, Australia
L. MARRAFFA
Affiliation:
Aerothermodynamics Section, ESA/ESTEC, Keplerlaan 1, PO Box 299, 2200AG, Noordwijk, the Netherlands
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Abstract

Emission spectroscopy measurements on a plasma representative of Titan atmosphere composition were obtained in the Inductively Coupled Plasma wind tunnel facility (VKI-Minitorch) at the von Karman Institute in Belgium. Temperatures ranged from 3600 to 5000 K, pressure was fixed at 300 mbar, and the molar composition was 1.9% CH4 and 98.1% N2. The high-pressure plasma was produced to obtain conditions close to equilibrium. In conjunction, line-by-line calculations have been carried out to assess the reliability of two distinct sets of molecular electronic transition moments, recently released, by predicting the radiative signature of high-temperature N2–CH4 plasma. The radiative transfer problem was solved by considering the plasma plume at local thermodynamic equilibrium conditions in an axisymmetric configuration. Comparisons between the synthetic and experimental spectra demonstrated good agreement for the CN Violet and high-wavelength CN Red bands, while some discrepancies were observed for the C2 Swan bands and low-wavelength CN Red bands.

Type
Papers
Information
Journal of Plasma Physics , Volume 79 , Issue 5 , October 2013 , pp. 525 - 534
Copyright
Copyright © Cambridge University Press 2013 

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