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A Study on Flame Extinction and Edge Flame Oscillation in Counterflow Diffusion Flame  

Park, Dae-Geun (부경대학교 에너지시스템공학과(원))
Yun, Jin-Han (한국기계연구원 그린환경기계본부)
Park, Jeong (부경대학교 기계공학부)
Keel, Sang-In (한국기계연구원 그린환경기계본부)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.13, no.2, 2009 , pp. 64-76 More about this Journal
Abstract
Experimental and numerical studies are conducted on the characteristics of flame extinction and edge flame oscillation in counterflow diffusion flames. The characteristics of flame extinction and edge flame oscillation are well described varying burner diameter, separation distance between two burners, global strain rate, and velocity ratio. It is verified numerically and experimentally that radial conduction heat loss significantly contributes to flame extinction and edge flame oscillation at low strain rate flames in zero- and micro-gravity. It is also shown that for appropriately small burner diameters flame extinction modes are grouped into four and these are significantly attributed to excessive radial conduction heat loss. The edge flame oscillation can be characterized well by one curve with Strouhal number and Peclet number.
Keywords
Edge Flame Oscillation; Flame Extinction; Flame-hole; Global Strain Rate; Lewis Number; Radial Conduction Heat Loss; Shrinking Flame-Disk;
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