Rory M. Kelly, David E. Gildfind, Timothy J. McIntyre

DOI Number XXX-YYY-ZZZ

Conference Number HiSST-2022-180

This paper reports on the analysis of hypersonic argon flows generated in the expansion tube X2 located
at the University of Queensland (UQ). A two dimensional wedge model was used for these experiments
with the goal of measuring the radiation over the surface of the model and in the expansion region.
Radiation was measured in front of the shock, between the shock and expansion fan and for some of
the region after the expansion fan. Measurements of the excitation temperature of the argon gas have
been made and reported twice previously for each density condition. In this paper, focus is placed on
the region in front of the shock. Significant electronic energy level populations were detected in the
freestream flow of both the low and high density experiments. It is found that this precursor radiation
is likely caused by radiation emitted from the hot argon above the wedge model, radiating upstream
and exciting the incoming free-stream argon and then re-radiating before reaching the shock layer.
Ionisation was measured in both low and high density experiments. The low density experiments were
found to have a higher amount of ionisation, and percentage ionisation before the shock layer.

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In Categories: 1.Events, HiSST 2022, Hypersonic Fundamentals and History
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