Abstract
The shear layers bounding the thermochemical relaxation region downstream from hypersonic Mach Reflections were investigated using burst-mode nitric oxide Planar Laser-Induced Fluorescence. The Mach reflections were produced by a pair of symmetric wedges in Mach 6.5 flows with total enthalpies ranging from 6 to 8 MJ/kg. The experiments took place in the Hypervelocity Expansion Tunnel (HXT) at the National Aerothermochemistry and Hypersonics Laboratory of Texas A&M University. The experimental Planar Laser-Induced Fluorescence measurements were performed at an effective rate of 250 kHz and targeted nitric oxide naturally generated by the strong shockwave. The investigation focused on the region 25 mm - 50 mm downstream from the normal shock. The natural background luminescence of electronically excited nitric oxide was sufficiently rejected, revealing subtle and complex flow features within the shear layers. In addition, a spectral analysis of the mode structures was performed.
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