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Flame Propagation Studies in a Four-Valve Pentroof-Chamber Spark Ignition Engine
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Abstract
Heat release analysis, ion current and laser Doppler velocimetry methods are combined to examine the effect of pre-spark turbulent mixture motion on flame propagation and combustion characteristics in the four-valve pentroof combustion chamber of a spark ignition engine. Two inlet port configurations leading to different strengths of induction-generated tumbling vortices are considered with emphasis on lean mixture operation under partial load conditions. The results show a good correlation between mixture turbulent characteristics at ignition and flame development, flame propagation rate, combustion duration and cyclic variability. It is shown that turbulence enhancement through induction-generated tumble counterbalances the lean mixture ignition delay by enhancing the flame propagation speed, leading to extension of the engine lean operating limits.
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Hu, Z., Whitelaw, J., and Vafidis, C., "Flame Propagation Studies in a Four-Valve Pentroof-Chamber Spark Ignition Engine," SAE Technical Paper 922321, 1992, https://doi.org/10.4271/922321.Also In
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