Bibliography - O, C. Kwon

1. Law, Chung K., and O, C. Kwon, 2004: Effects of Hydrocarbon Substitution on Atmospheric Hydrogen-Air Flame Propagation. International Journal of Hydrogen Energy, 29(8), doi:10.1016/j.ijhydene.2003.09.012 867-879
   [ Abstract ]

   In order to evaluate the potential of partial hydrocarbon substitution to improve the safety of hydrogen use in general and the performance of internal combustion engines in particular, the outward propagation and development of surface cellular instability of spark-ignited spherical premixed flames of mixtures of hydrogen, hydrocarbon, and air were experimentally studied at NTP condition in a constant-pressure combustion chamber. With methane, ethylene, and propane being the substituents, the laminar burning velocities, the Markstein lengths, and the propensity of cell formation were experimentally determined, while the laminar burning velocities and the associated flame thicknesses were computed using recent kinetic mechanisms. Results show substantial reduction of laminar burning velocities with hydrocarbon substitution, and support the potential of propane as a suppressant of both diffiusional–thermal and hydrodynamic cellular instabilities in hydrogen–air flames. Such a potential, however, was not found for methane and ethylene as substituents.

2. Kwon, O, C., G. Rozenchan, and Chung K Law, 2002: Cellular Instabilities and Self-Acceleration of Outwardly Propagating Spherical Flames. Proceedings of the Combustion Institute, 29(2), doi:10.1016/S1540-7489(02)80215-2 1775-1784
   [ Abstract ]

   Using a recently developed constant and high-pressure combustion chamber, an experimental study was conducted on several aspects of cellular instabilities of outwardly propagating spherical premixed flames. Propane/air and hydrogen/oxygen/nitrogen flames of different concentrations and under elevated pressures were used to systematically identify the influences of thermal expansion ratio, flame thickness, global activation energy, mixture Lewis number, and global stretch rate on the generation of hydrodynamic and diffusional-thermal cells over the flame surface. In particular, it was demonstrated that hydrodynamic instability is greatly enhanced with increasing pressure and hence decreasing flame thickness, although the influence can also be moderated by the progressively important three-body termination reactions as the pressure increases. The onset of cellular instability was examined in light of the theory of Bechtold and Matalon, and satisfactory qualitative and acceptable quantitative comparisons were observed. The cellular flames were found to be self-accelerating, including those that are diffusionally unstable, with fractal dimensions between 2.20 and 2.25.

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