Stability Boundaries of the Dynamic States in Pulsating and Cellular Flames

A flat, premixed flame stabilized on a circular porous plug burner at low pressure appears as a luminous disk. As the control parameters are adjusted, methaneair and methane-oxygen mixtures produce pulsating flames that exhibit both traveling-wave and standing-wave dynamic states, and isobutane-air and propane-air flames form ordered patterns of concentric luminous rings of cells that bifurcate into dynamics states in which the cells move in collective motion. In this paper the measurement and presentation of stability boundaries are discussed for representative examples of pulsating and cellular flames.