Abstract
C3H8-O2-N2 mixtures were spark-ignited in a motored engine cylinder, and the mass fractions of CO2, CO, H2 and hydrocarbons in the cylinder during the exhaust process were investigated. In the vicinity of the limits of flame propagation in the engine cylinder, branched flames, which propagate at relatively slow speed, appear. In the mixture composition in which the branched flames appear, the mass fraction of CH4 increases extremely, but no discontinuous changes occur in the mass fraction of CO2, CO, O2, H2, and high combustion efficiency was recognized. Furthermore, the effects of pressure and temperature on the quenching distance were expressed by an empirical equation. Quenching distance at combustion end were calculated, and the change in the mass fraction of total hydrocarbons versus the mixture composition was estimated.
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