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Laminar Burning Velocities and Flame Stability Analysis of Hydrocarbon/Hydrogen/Carbon Monoxide-air Premixed Flames  

Vu, Tran Manh (부경대학교 기계공학과)
Song, Won-Sik (부경대학교 기계공학과)
Park, Jeong (부경대학교 기계공학과)
Lee, Kee-Man (순천대학교 우주항공공학과)
Publication Information
Journal of the Korean Society of Combustion / v.16, no.2, 2011 , pp. 23-32 More about this Journal
Abstract
To investigate cell formation in hydrocarbon/hydrogen/carbon monoxide-air premixed flames, the outward propagation and cellular instabilities were experimentally studied in a constant pressure combustion chamber at room temperature and elevated pressures. Unstretched laminar burning velocities and Markstein lengths of the mixtures were obtained by analyzing high-speed schlieren images. In this study, hydrodynamic and diffusional- thermal instabilities were evaluated to examine their effects on flame instabilities. The experimentally-measured unstretched laminar burning velocities were compared to numerical predictions using the PREMIX code. Effective Lewis numbers of premixed flames with methane addition decreased for all of the cases; meanwhile, effective Lewis numbers with propane addition increased for lean and stoichiometric conditions and increased for rich and stoichiometric cases for hydrogen-enriched flames. With the addition of propane, the propensity for cell formation significantly was diminished, whereas cellular instabilities for hydrogen-enriched flames were promoted. However, similar behavior of cellularity was obtained with the addition of methane to the reactant mixtures.
Keywords
Cellular instability; Effective lewis number; Premixed flame; Unstretched laminar burning velocity; Markstein length; Hydrodynamic instability; Diffusional-thermal instability; Critical radius; Critical peclet number;
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