Response of flame speed to positively and negatively curved premixed flames

We address flame stretch effects on two-dimensional premixed ‘regular’ (RF) and ‘inverted’ (UF) flames burning methane–air and propane–air mixtures through an experimental investigation. The regular flames have a negative curvature and are concave to the unburned mixture, while the inverted flames are positively curved and convex. The response to stretch (that addresses the influence of curvature) differs along the planar and curved regions of …