Experimental Determination of the Flame Quenching Distance in a Spark-Ignition Engine

Samples of the gas from the vicinity of the wall of a spark-ignition engine operating on iso-octane has been obtained by the use of a hydraulically controlled high-speed gas-sampling valve (operating time 1 msec), during an earlier investigation (1)*.

A theoretical model describing the flow through the gas-sampling valve is developed. This model is used to interpret the experimental data to compute the thickness of the quenching layer (the quenching distance).

The resulting quenching distance is in reasonable agreement with the results obtained by other investigators using different theoretical experimental techniques.