1966-02-01

Experimental Determination of the Dependence of the Minimum Spark Ignition Energy Upon the Rate of Energy Release 660346

The conventional ignition system utilizing an induction coil produces a spark consisting of a capacitive or high energy rate component and an inductive or low energy rate component. Predominant among conflicting arguments reported in the literature is the argument that the high energy rate component is the more effective for ignition of combustible mixtures. An investigation was conducted to measure the effect of the rate of energy release upon minimum spark ignition energy with electrode spacings greater than the quench distances reported in the literature. Lean, quiescent, propane-air mixtures were studied in a constant volume bomb. Results indicate that the minimum ignition energy decreased as the instantaneous peak power or peak rate of energy release was increased.

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