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Title:Boron Particle Ignition and Combustion in a Shock Tube Using Time -Resolved Spectroscopy
Author(s):Spalding, Martin John
Doctoral Committee Chair(s):Krier, Herman
Department / Program:Mechanical Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Physics, Fluid and Plasma
Abstract: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.
Issue Date:2000
Type:Text
Language:English
Description:166 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2000.
URI:http://hdl.handle.net/2142/84000
Other Identifier(s):(MiAaPQ)AAI9955669
Date Available in IDEALS:2015-09-25
Date Deposited:2000


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