Figure 2: Averaged stretch factor I₀ in bins I-IV corresponding to different wall-normal distances (a). The bin I corresponds to the near wall region, while bin IV is in the channel core. The blue corridor denotes one standard deviation. For reference, the range of I₀ values for homologous laminar flames is marked by the gray shaded area. Local stretch factor I₀ plotted against the local Karlovitz number (b).