OH-radical behavior of unsteady lifted flame based on instantaneous change of the equivalence ratio |
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Authors: | S H Jun T K Kim J Y Jang Y Kidoguchi |
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Institution: | 1. Department of Ecosystem Engineering, Tokushima University, Tokushima, 770-8506, Japan 2. School of Mechanical and Automotive Engineering, Keimyung University, Daegu, 704-701, Korea 3. The Center for Automotive Parts Technology, Keimyung University, Daegu, 704-701, Korea
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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. |
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