Abstract
The dependence of ultra-high EGR and low oxygen diesel combustion on fuel properties was investigated with a single cylinder 1.0 L DI diesel engine. Decreasing cetane number in fuels significantly reduces the smoke emission due to an extension in the ignition delay and the subsequent improvement in mixture formation. Smokeless combustion, ultra-low NO_x, and efficient operation range for EGR and for IMEP are remarkably extended when decreasing the cetane number. Changes in fuel distillation temperature do not result in significant differences in the smoke emission and thermal efficiency at ultra-high EGR operation, and smokeless operation is established even with higher distillation temperature fuels when the cetane number is 40.
