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.
Flame Propagation Studies in a Four-Valve Pentroof-Chamber Spark Ignition Engine
Sae Technical Papers
International Fuels & Lubricants Meeting & Exposition ; 1992
1992-10-01
Conference paper
English
Flame propagation studies in a four-valve pentroof-chamber spark ignition engine
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