Computer Science
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.583...33r&link_type=abstract
Proceedings of the International Workshop on Radiation of High Temperature Gases in Atmospheric Entry - Part II (ESA SP-583). 30
Computer Science
Scientific paper
This work takes place in the frame of the Cassini-Huygens programme whose purpose is to explore Saturn system. This study should help to estimate the radiation emitted during the entry of the Huygens probe in the atmosphere of Titan which is composed of a majority of nitrogen and a few percents of methane and argon. The radiative conditions of Huygens entry are simulated on ground by the propagation of a shock wave in a shock tube filled with a mixture representative of the atmosphere of Titan. TCM2 (Tube à Choc Marseille 2) wind tunnel used as a shock study within this study is able to produce shock waves with high and moderate Mach numbers in low pressure. Radiation is recorded thanks to a spectrometer + streak system which is able to give a time spectral picture of the shock. Several species and systems have been tracked for two working points (initial pressure : 200 Pa and 40 Pa, velocity : 5500 m/s) for four mixture compositions with argon proportion varying between 0 and 10% and methane proportion varying between 1 and 5 %. CN violet system was expected to be the main radiator and it has been observed along its ?v=0 and ?v=-1 bands. For each run, evolution of the emission with time has been recorded as well as the spectra at different time (or distance) behind the shock. Rotational and vibrational temperatures have been extracted by comparison with calculated spectra. CN red system and C2 Swan bands was also expected to take a non negligible part of the emission so these systems have been tracked to estimate the ratio between their emissions and CN violet emission. Last, considering the complexity of the optical system, a calibration of the emission measurements have been carried out in order to obtain an order of magnitude of the flux emitted behind the shock wave at different wavelengths.
Boubert Pascal
Chikhaoui Aziz
Félio Jean-Marie
Rond Catherine
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