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The Effects of Initial Flame Kernel Conditions on Flame Development in SI Engine
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Abstract
The initial flame kernel behavior in a SI engine was measured by a spark-plug-fiber-optics probe. From these measurements, the flame kernel may be characterized by an expansion speed and a convection velocity. These quantities were correlated with the bum rate on a cycle-to-cycle basis in an engine configurated with quiescent, swirl, and tumble in-cylinder motion. The expansion speed correlates well with the 0-2 percent mass burn duration for all the configurations. The flame convection velocity depends on the in-cylinder motion in the expected manner. There was, however, only a weak correlation between the 10-90 percent burn duration and the initial flame kernel behavior.
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Bianco, Y., Cheng, W., and Heywood, J., "The Effects of Initial Flame Kernel Conditions on Flame Development in SI Engine," SAE Technical Paper 912402, 1991, https://doi.org/10.4271/912402.Also In
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