The document summarizes an experiment using ultraviolet emission spectroscopy to analyze the hydroxyl radical in the exhaust plumes of miniscale polymethyl methacrylate (PMMA) hybrid rocket motors. The experiment measured the effect of oxidizer flow rate and burn time on irradiance levels and mapped the concentration of hydroxyl radicals in the plume. Results showed irradiance increased with oxidizer flow rate up to 0.017 mol/s and increased linearly over time. Hydroxyl radicals were found to exist in a smaller envelope than the visible plume area, peaking close to the motor exit.
1. Ultraviolet Emission Spectroscopy of the Hydroxyl Radical in Miniscale PMMA Hybrid Rocket Motor Exhaust Plumes Kellen Harkness Department of Chemistry Harding University ASGC Conference – 20 April 2007
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