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Full-Text Articles in Mechanical Engineering
Carbon Monoxide Measurements In A Co2 Plasma Using Two-Photon Laser Induced Fluorescence, Brandon Voll
Carbon Monoxide Measurements In A Co2 Plasma Using Two-Photon Laser Induced Fluorescence, Brandon Voll
Graduate College Dissertations and Theses
Uncertainties in surface catalytic reaction rates in a CO2 plasma have led to overdesign of thermal protection systems, which has caused planetary entry vehicles for the Martian atmosphere to be heavier than necessary. This, in turn, has decreased the available payload of various missions. A better understanding of these reaction rates will allow more precise development of thermal protection systems leading to safer and more effective atmospheric entry vehicles. Near wall measurements in a plasma facility using laser spectroscopic techniques with sub-millimeter spatial resolution provide a method to determine surface-catalyzed reaction efficiencies over metallic surfaces. The present work includes laser …
Assessment Of Surface-Catalyzedreaction Products From Hightemperature Materials In Plasmas, Luke Daniel Allen
Assessment Of Surface-Catalyzedreaction Products From Hightemperature Materials In Plasmas, Luke Daniel Allen
Graduate College Dissertations and Theses
Current simulations of atmospheric entry into both Mars and Earth atmospheres for the design of thermal protections systems (TPS) typically invoke conservative assumptions regarding surface-catalyzed recombination and the amount of energy deposited on the surface. The need to invoke such assumptions derives in part from lack of adequate experimental data on gas-surface interactions at trajectory relevant conditions. Addressing this issue, the University of Vermont's Plasma Test and Diagnostics Laboratory has done extensive work to measure atomic specie consumption by measuring the concentration gradient over various material surfaces. This thesis extends this work by attempting to directly diagnose molecular species production …