Ignition and oxidation of dilute silane-oxidizer mixtures behind reflected shock waves
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High-temperature experiments were performed behind reflected shock waves using SiH4, SiH4/O2, H2/O2, SiH4/H2/O2, CH4/O2, and SiH4/CH4/O2mixtures highly diluted in argon. Reflected-shock temperatures ranged from 1050-2250 K at a pressure near 1 atm. Reaction progress was monitored by observing the time histories of several species, including OH*SiH4, SiH2, and CH*using emission and laser absorption techniques. The oxidation and ignition data are reported in the form of species concentration profiles and plots of characteristic times as a function of temperature. The species time histories exhibit a dual oxidation behavior for most of the fuel/O2/SiH4 experiments, indicating the silane reacts first followed by reaction of the fuel with the remaining oxygen. As expected, the presence of silane in the fuel/O2mixtures markedly reduced the ignition delay time, usually by a factor of two or more even at molar SiH4 concentrations as low as 1% of the fuel concentration. The database presented herein can be used to validate chemical kinetics models of hightemperature silane oxidation for propulsion and materials processing applications. © 2002 by The Aerospace Corporation.
author list (cited authors)
Petersen, E. L., & Crofton, M. W.