Numerical modelling and experimental validation of laminar flame flashback in tube burners for H2-enriched methane-air combustion

Abstract

The propagation of the flame upstream of its stable location in burners (i.e., flame flashback) is probably the main challenge in hydrogen combustion. Thus, the laminar flashback velocity of H₂-CH₄/Air flames is studied using experiments and CFD. The effect of changing the velocity profile is studied using a cylindrical inset, lowering the wall velocity gradient. An increased flashback resistance was observed for 60% H₂ enrichment. Results suggest core flow flashback rather than boundary layer flashback (as initially expected), which is confirmed by CFD