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http://dx.doi.org/10.3795/KSME-B.2003.27.10.1401

Extinction in a Counterflow Nonpremixed Flame Interacting with a Vortex  

Oh, Chang-Bo (인하대학교 기계기술공동연구소)
Lee, Chang-Eon (인하대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.27, no.10, 2003 , pp. 1401-1411 More about this Journal
Abstract
A two-dimensional direct numerical simulation was performed to investigate the flame structure of CH$_4$$N_2$-air counterflow nonpremixed flame interacting with a single vortex. The detailed transport properties and a modified 16-step augmented reduced mechanism based on Miller and Bowman's detailed chemistry were adopted in this simulation. The characteristic vortex and chemical time scales were introduced to quantify and investigate the extinction phenomenon during a flame-vortex interaction. The results showed that fuel- and air-side vortex cause an unsteady extinction. In this case, the flame interacting with a vortex was extinguished at much larger scalar dissipation rate than steady flame. It was also found that the air-side vortex extinguished a flame more rapidly than the fuel-side vortex. Furthermore, it was noted that the degree of unsteady effect experienced by a flame can be investigated by comparing the above two characteristic time scales, and this analysis could give an appropriate reason for the results of the previously reported experiment.
Keywords
Counterflow Flame; Flame-Vortex Interaction; Extinction; Direct Numerical Simulation; Augmented Reduced Mechanism;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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