Effect of a novel piston geometry on the combustion process of a light-duty compression ignition engine: An optical analysis

Abstract The development of new piston geometries has shown great potential to achieve the low levels soot emissions required by regulation. Thus, present paper aims characterize influence a design over combustion process. It is characterized introduction protrusions around periphery bowl, evenly spaced. performance this geometry compared other that have been extensively analyzed in literature, under similar operating conditions. To objective, single cylinder optical compression ignition engine was used with full-quartz pistons representing three bowl geometries: re-entrant, stepped lip and wave-stepped lip. Two techniques (OH∗ chemiluminescence Natural Luminosity-NL) were applied for identifying near-stoichiometric zones differences evolution. flame movement applying image velocimetry (CIV) algorithms. In addition, an in-cylinder pressure analysis performed each at 4.5 bar 7.5 bar IMEP terms Rate Heat Release highlighted. A more intense reverse flow clearly identified when using wave inside bowl. faster late cycle oxidation much than re-entrant piston.