Combustion characteristics of n-heptane spray combustion in a low temperature reform gas/air environment

This paper presents a large eddy simulation study of n-heptane spray combustion in an low temperature reform (LTR) gas environment constant volume chamber, under conditions relevant to single-fuel reactivity controlled compression ignition (RCCI) engines. The LTR is made up partially oxidized intermediate species from rich n-heptane/air mixture external reformer. It found that higher results longer delay time the and liftoff length, due chemical effect difference reaction zone structures. A significantly different flame structure identified RCCI case combustion. After onset high ignition, double-layer established case, with diffusion layer lean premixed layer. affects flow field, which suppresses mixing around tip. As result, exhibits lower NOx formation but soot than case.