Flame Blow-off Determination via Damkohler Number Analysis

The combustor domain is divided into discrete cells, and the analysis is performed locally within each cell. This segmentation allows complex flow mechanics and chemical reactions to be modeled accurately in each region while maintaining computational efficiency. The Damköhler number is calculated separately for each cell, enabling precise identification of blow-off conditions without requiring overly complex global models.

The method employs cell-specific residence times and detailed combustion chemistry for each local region. Instead of using uniform global parameters, the analysis accounts for spatial variations in flow velocity, temperature, and fuel mixture composition. This local quality approach enables accurate determination of blow-off conditions in specific critical zones while simplifying less critical regions.

By dividing the combustor into discrete cells, the computational domain is managed in smaller, more manageable units. This segmentation allows detailed chemistry to be performed only in cells where it is most critical (such as near the flame front), while simpler models can be used in other regions, thereby reducing overall computational time while maintaining high reliability where needed.

The method performs detailed combustion chemistry calculations selectively rather than uniformly throughout the entire domain. Detailed chemistry is applied partially to regions where flame blow-off is most likely to occur, while coarser models are used elsewhere. This partial action approach maintains sufficient reliability for safety-critical assessments while significantly reducing computational time compared to full detailed modeling everywhere.