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Radiative heat transfer measurements in low density titan atmospheres
Conference paper   Peer reviewed

Radiative heat transfer measurements in low density titan atmospheres

Carolyn Jacobs, R G Morgan, T J McIntyre and C O Laux
Proceedings of the 18th American Institute of Aeronautics and Astronautics 3AF International Space Planes and Hypersonic Systems and Technologies Conference, pp.1-16
American Institute of Aeronautics and Astronautics (AIAA) 3AF International Space Planes and Hypersonic Systems and Technologies Conference, 18th (Tours, France, 24-Sep-2012–28-Sep-2012)
American Institute of Aeronautics and Astronautics, Inc.
2012
DOI: https://doi.org/10.2514/6.2012-5921
url
https://doi.org/10.2514/6.2012-5921View
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Abstract

The X2 facility at the University of Queensland was modified to allow experimentation at low pressures in nonreflected shock tube mode. Three Titan conditions (98% N2, 2% CH4) were examined. Emission spectroscopy measurements were taken for these conditions, with freestream pressures of 13, 8, and 4 Pa, and average shock speeds of 6.4, 6.2, and 9.0 km/s respectively. A region approximately 100 mm long was imaged onto the entrance slit of the spectrometer. Comparisons with previous experimental work and computational models showed that the peak nonequilibrium radiative heat transfer level behind the shock was consistent for the 13 and 8 Pa conditions. The spectral results showed that in comparison to these previous results, the modified facility resulted in a significant improvement in signal strength and increase in the length of test flow available at such low pressure conditions, allowing finer spectral resolution and the potential, if needed, for further spatial resolution. For the 4 Pa condition, experimental results were successfully gathered to provide information about the nonequilibrium peak and fall-off rate of the radiative heating behind the shock wave. The results showed consistency and repeatability in the new low pressure condition, and sufficient test time and test gas was available to allow the capture of high resolution spectral images. © 2012 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

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