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International Journal of Automotive Technology > Volume 10(6); 2009 > Article
International Journal of Automotive Technology 2009;10(6): 663-668.
OH-RADICAL BEHAVIOR OF UNSTEADY LIFTED FLAME BASED ON INSTANTANEOUS CHANGE OF THE EQUIVALENCE RATIO
S. H. JUN1, T. K. KIM2, J. Y. JANG3, Y. KIDOGUCHI1
1Tokushima University
2Keimyung University
3Keimyung Universtiy
ABSTRACT
In an earlier study, the current authors showed that an unsteady-state lifted flame generated by an equivalence ratio conversion system for a given fuel, was similar to a steady-state lifted flame in terms of the change characteristics from a premixed flame to a critical flame and then to a triple flame with a diffusion flame positioned in the middle according to the concentration difference. Therefore, this study used an OH-PLIF method to investigate the characteristics of a steady-state lifted flame and an unsteady-state lifted flame created under conditions identical to the flames in the preceding study. PLIF (Planar laser induced fluorescence) is practically effective for visualizing the concentration fields within a flame. The resulting OH-radical measurements showed that an unsteady-state lifted flame created under the specific conditions used in this study showed similar tendencies in terms of OH-radical distribution, fluorescence intensity, and liftoff height, to a steady-state lifted flame, thereby confirming that the behavior of an unsteady-state lifted flame can be effectively predicted based on the behavior of a steady-state lifted flame.
Key Words: Lifted flame, Premixed flame, Triple flame, Unsteady flame, OH-PLIF
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