Dynamics of flame propagation using laser-induced spark initiation: Ignition energy measurements

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Abstract
A method is described for measuring low‐energy ignition of combustable mixtures using nanosecond and picosecond laser‐induced breakdown. Ignition studies are reported for homogeneous H2/air mixtures. The extent of flame inhibition in H2/air was investigated as a function of CO2 concentration. Our electrodeless spark ignition results are compared with earlier work using electric discharge ignition. A simple model for flame ignition is advanced, based on the temporal and energy density characteristics of the source energy. Implications of laser‐induced spark ignition in homogeneous fuel mixtures to the molecular dynamics of flame propagation are discussed.