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Krier, Herman Spalding, Martin John 2015-09-25T21:13:05Z 2015-09-25T21:13:05Z 10000-01-01 2000 2000 Boron particles ignited in Ar/F/O2 mixtures show a rapid decrease by a factor of four in ignition and burning times as the mole fraction ratio XF/XO2 is increased from 0 to 0.25. For values of XF/XO2 greater than 0.5 there is little change of ignition burning time with XF/XO2 . Spectroscopic data taken in pure oxygen environments show residual BO2 emission after particle combustion, while that taken in fluorine-containing environments show little or no emission from BO2, consistent with predictions from theoretical modeling efforts. When boron particles are burned in Ar/N2/O2 atmospheres, there is a decrease of over 60% in ignition delay times as XN2 is increased from 0 to 0. 8 with XO2 held constant at 0.20. Ignition delay times also decrease from 335 mus to 160 mus as XNO is increased from 0.005 to 0.075 +/- 0.015 in N2/NO/O2 environments. Addition of CO2 to Ar/O2 mixtures increases ignition delay times. Theoretical predictions of ignition times for boron particles from a boron particle combustion model developed in the course of the present study as well as predictions of ignition and combustion times from a chemical kinetics based boron particle combustion model compare well with experimental times measured in N2/O2 and in O2/F atmospheres. Made available in DSpace on 2015-09-25T21:13:05Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 9955669.pdf: 9562217 bytes, checksum: aff22c8ab1f6cf2aee6fa18740d4bc50 (MD5) Previous issue date: 2000 Embargo set by: Seth Robbins for item 85281 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 166 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2000. http://hdl.handle.net/2142/84000 (MiAaPQ)AAI9955669 eng Physics, Fluid and Plasma Boron Particle Ignition and Combustion in a Shock Tube Using Time -Resolved Spectroscopy text Mechanical Engineering Mechanical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.