Abstract
Effects of inert gases on the vortex bursting in a small-diameter tube have been experimentally investigated using nitrogen, and carbon dioxide as inert gas. Methane was used as fuel. Results show that the flame speed V_f of carbon dioxide flame takes its maximum at Φ=0.7 where the flame diameter D_f is minimum. Detailed flame observations have revealed that, just after the ignition, the flame near the burner exit was extinguished by the strong wall effect, and the slender small flame propagates rapidly along the vortex axis without an approach to the wall.
