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http://dx.doi.org/10.3795/KSME-B.2012.36.12.1209

Transition Phenomenon from a Flat Flame to Turbulent Flame Motions by External Laser  

Park, June Sung (Environment & Plant Team, Korean Register of Shipping)
Choi, Byung Chul (Environment & Plant Team, Korean Register of Shipping)
Fujita, Osamu (Division of Mechanical and Space Engineering, Hokkaido Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.36, no.12, 2012 , pp. 1209-1215 More about this Journal
Abstract
Experiments with premixed flames in a tube have been conducted to investigate the transition phenomenon from a laminar flat flame to turbulent motions. To induce this phenomenon, a flat flame is formed in a tube. Then, the local velocity at the center of the flat flame surface is increased using $CO_2$ laser irradiation. The deformed flame front propagates with an increase in the total flame surface and oscillating instability. Eventually, the flame front accelerates explosively, and it shows turbulent flame motions with a strong noise. The dynamic behaviors of the flame front prior to the turbulent motions are analyzed in this study to elucidate this process. The physical model of the process is presented according to observations.
Keywords
Acoustic Instability; External Laser Irradiation; Flame Curvature; Diffusive-thermal Instability;
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