Abstract
An experimental study was made to investigate the effect of combustion chamber configuration and top clearance on in-cylinder combustion in a spark-ignited natural gas engine. Flame propagation in a single-cylinder visualization engine was measured from the cylinder axis direction by the high speed schlieren method, over the wide range of combustion chamber configuration and top clearance. The results showed that smaller piston cavity diameter led to more rapid flame propagation, resulting in larger heat release rate and larger cylinder pressure. Top clearance had little effect on flame propagation, resulting in little difference in heat release rate and cylinder pressure.
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