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http://dx.doi.org/10.3795/KSME-B.2012.36.12.1193

Flame Instability in Heptane Pool Fires Near Extinction  

Jeong, Tae Hee (Dept. of Safety Engineering, Pukyoung Nat'l Univ.)
Lee, Eui Ju (Dept. of Safety Engineering, Pukyoung Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.36, no.12, 2012 , pp. 1193-1199 More about this Journal
Abstract
A cup burner experiment was performed to investigate the effect of the oxidizer velocity and concentration on flame instability near extinction. Heptane was used as a fuel and air diluted by nitrogen and carbon dioxide was used in the oxidizer stream. Two types of flame instabilities at the flame base and at axial downstream were observed near extinction. The instability at the flame base could be characterized by cell, swing, and rotation modes, and the cell mode changed to the rotation mode through the swing mode as the oxidizer velocity increased. To assess the parameters for the flame instability, the initial mixture strengths, Lewis number, and adiabatic flame temperature were investigated under each condition. The Lewis number might be the most important among them, but it is impossible to generalize because of the insufficient number of cases. Furthermore, the axial periodic flickering motion disappeared at low and high oxidizer velocities near extinction. This resulted from the fact that low oxidizer velocity induced evaporated fuel velocity below the critical velocity and high velocity made the reacting fuel velocity comparable.
Keywords
Pool Fire; Cup Burner; Inert Gas; Flame Instability; Flickering Frequency;
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Times Cited By KSCI : 1  (Citation Analysis)
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