Abstract—Interaction of multiple premixed laminar flames was studied by visualizations of the modified flame structures. Typical line-of-sight flame chemiluminescence image and spatial resolved OH distribution by means of planar laser-induced fluorescence (OH-PLIF) technique were applied for these observations. The premixed flames of liquefied petroleum gas (LPG)/air mixture with three inline nozzles were established to simulate the practical flame characteristics produced by the practical cooking burners. The obtained results are compared as a function of primary equivalence ratio () and inter-distance (S/Do) between nozzles. Effect of S/Do and on the multiple premixed flame structures is well understood via the clarifying reaction zone distribution, which is in-situ visualized by OH PLIF technique. S/Do has a strong effect on interactions between flames, resulting in either flame enhancement or flame inhibition, depending on . CO and NOx emissions were measured in order to confirm the combustion performance of the multiple flames. It is recommended that the in-situ visualization is the focus for a study of the flame. This will help to avoid misunderstanding of the real combustion as it can be occurred by using the line-of-sight observation technique.
Index Terms—Partially premixed flame, flame structures, reaction zone, OH-PLIF, interaction between flames.
U. Makmool is with the Pilot Plant Development and Training Institute, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand (e-mail: usa.mak@kmutt.ac.th).
S. Jugjai is with Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand (e-mail: sumrueng.jug@kmutt.ac.th).
S. Tia is with Department of Chemical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok, Thailand (e-mail: suvit.tia@kmutt.ac.th).
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Cite:U. Makmool, S. Jugjai, and S. Tia, "Visualization of Multiple Flame Interactions: Appearance Structure and Combustion of LPG-Air Premixed Laminar Flames," Journal of Clean Energy Technologies vol. 3, no. 3, pp. 196-201, 2015.
