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Soot Formation Characteristics on the Instability of Laminar Diffusion Flames  

Nam, Youn-Woo (단국대학교 기계공학과)
Lee, Won-Nam (단국대학교 기계공학과)
Publication Information
Journal of the Korean Society of Combustion / v.15, no.3, 2010 , pp. 74-81 More about this Journal
Abstract
In this study, soot formation characteristics on the instability of laminar diffusion flames were investigated experimentally using a concentric co-flow burner. When a small amount of air was supplied through an inner nozzle, a stable propane laminar diffusion flame became unstable and began to oscillate mainly due to the dilution effect. The increase of air flow rate transformed an oscillating non-sooting flame into a stable nonsooting flame. When the air flow rate was continuously increased an inner flame was formed and the flame was changed to an oscillating sooting flame, an oscillating non-sooting flame and finally a stable non-sooting hollow flame. When the air flow rate was decreased, a non-sooting hollow flame was eventually changed back to a stable non-sooting flame. The presence of an inner flame, however, altered the soot formation characteristics of a flame. More soot production was observed with the presence of an inner flame. The increased or decreased soot formation/oxidation rates, the radiation heat loss, and the heating effect of inner flames are most likely to be responsible for the observed instability of laminar diffusion flames.
Keywords
Flame instability; Laminar diffusion flame; Buoyancy effect; Soot; Radiation heat loss;
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Times Cited By KSCI : 1  (Citation Analysis)
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