Spark ignition of near the lean limit CH 4air mixtures at low pressures

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The minimum spark ignition energy in methaneair mixtures was measured for pressures between 0.1 and 0.4 atm and methane concentrations near the lean ignition limits. Spark gap sizes between 2 and 10 mm and spark durations between 70 and 120 μs and a maximum spark energy of 600 mJ were used to identify lowest ignited methane concentrations. These concentrations were found in good agreement with previous measured lower limits of flammability using similar apparatus.