Technical Paper
Hydrogen Lean-Combustion Studies in a Four-Stroke DI Radical-Ignition Diesel Engine with EGR
2007-07-23
2007-01-1887
A detailed examination is made of the effects of exhaust gas recirculation (EGR) on hydrogen radical ignition in a four-stroke direct-injection (DI) diesel engine. “Radical ignition” (RI) species are first generated in secondary chambers, called mini-chambers (M-Cs), located in the cylinder head. More are generated in the main chamber. Some of these are then carried over to the next cycle. It is their pre-presence and participation in the next autoignition event that enables engine operations under ultra-lean fuel conditions at normal diesel compression ratios. The thrust of this study is to explore the prospect of using the portion of the RI species being returned via EGR to better manage autoignition timings.