Extinction and Stability of Burner-Stabilized Diffusion Flames
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2016-12
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[Honolulu] : [University of Hawaii at Manoa], [December 2016]
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Abstract
A steady state solution was derived and a stability analysis was carried out for a diffusion flame produced by a reactant issuing from a spherical porous burner into a second quiescent reactant. A one-step irreversible reaction using Arrhenius kinetics, an optically thin model for radiation, high reaction and radiation activation energies and nonunity Lewis numbers were used. A small perturbation due to wrinkling produced the trivial solution. The steady state solution showed flame existence and these results suggest that the flame is absolutely stable. Numerical results were produced for steady state burning of ethylene in air. Four different flames with the same stoichiometry and adiabatic flame temperature, varying in flame structure and convection direction were analyzed. At low flow rates, kinetic extinction due to reactant leakage was observed. Increasing radiative heat losses promoted kinetic extinction. Increased flow rates resulted in increased residence times as well as increased radiative heat losses. At high flow rates, radiative heat loss dominated residence time and radiative extinction was observed. A parametric study on the Lewis number (Le) was performed. Increases in Le of the burner issuing reactant and decreases in Le of the quiescent reactant promoted flame extinction. Flame extinction was more sensitive to quiescent reactant Le variations than burner issuing reactant Le variations.
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M.S. University of Hawaii at Manoa 2016.
Includes bibliographical references.
Includes bibliographical references.
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Theses for the degree of Master of Science (University of Hawaii at Manoa). Mechanical Engineering
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