Analysis of the Correlation between Flow and Combustion Characteristics in Spark-ignited Engine
As global emission standards are getting stringent, it is inevitable to increase the thermal efficiency through the high compression ratio in spark-ignited engines. Various researches are being conducted to mitigate knock caused by increased compression ratio, which requires an understanding of the combustion phenomena inside the combustion chamber. In particular, the flow is a major factor affecting the entire combustion process from the generation to propagation of flames. In the field of spark-ignited engine research, where interest in lean combustion concept and expansion of EGR supply is increasing, flow analysis is essential to secure rapid flame propagation speed and stable combustion process. In this study, the flow around the spark plug was measured by the Laser Doppler Velocimetry system, and then the correlation with combustion in the spark-ignited engine was analyzed.