Flame Extinction Model™

Extinction is an important phenomena in low emissions combustion systems using staged combustion.  Many designs operate near the edge of Lean Blow Off or lean extinction and it is important to understand how your design’s combustion stability is affected by local operating condition affects and fuel/air ratios.  The new flame-extinction model provides an automated method for determining the flame-extinction strain rate for premixed flames in an opposed-flow flame configuration.  The extinction strain rate is accurately determined through use of a continuation method.  The calculation can be performed within a parameter study as well, to determine extinction strain rate as a function of conditions, such as fuel-air equivalence ratio.

Flame response curve showing extinction (turning point) for premixed stoichiometric methane-air flame.

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