Improvement of burning velocity by in-cylinder flow is important to achieve higher thermal efficiency of gasoline engines by further lean burn technique with EGR. Therefore, influences of turbulence scale on combustion duration and flame shape were investigated in this study.
The combustion durations, especially in initial combustion stage, were reduced by the smaller size of turbulent eddy even at the same turbulence intensity.

Masayoshi Morita
Kyushu university