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http://dx.doi.org/10.15231/jksc.2013.18.1.013

Leading Edge Statistics of a Turbulent Premixed Flame  

Kwon, Jaesung (포항공과대학교 기계공학과 대학원)
Huh, Kang Y. (포항공과대학교 기계공학과)
Publication Information
Journal of the Korean Society of Combustion / v.18, no.1, 2013 , pp. 13-20 More about this Journal
Abstract
Leading edge statistics are obtained by direct numerical simulation(DNS) of freely propagating incompressible and stagnating compressible turbulent premixed flames. Conditional averages of velocities in terms of reaction progress variable, c, and local flame surface density, ${\sum}^{\prime}_f$, are defined and compared through the flame brush. It holds asymptotically that $<u>_f=<S_d>_f$ and $<u>_u-<u>_b=D_t/L_w$ with the characteristic length scale of $\bar{c}$ variation, $L_w$. It also holds that $<u>_b=<u>_f$ for a freely propagating flame under no mean strain rate. The turbulent burning velocity, $S_T$, is determined by the conditional statistics at the leading edge under large activation energy.
Keywords
Turbulent premixed combustion; Turbulent burning velocity; Stagnating flame; Freely propagating flame; Leading edge;
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