Abstract
Split injections in DI Diesel engines and combustion vessels exhibit different ignition phenomena for the first and for the second injection pulse. In this work, the ignition phenomena of a split injection into a combustion vessel are investigated experimentally and numerically. The first pulse of the split injection is injected into quiescent air; combustion is an auto-ignition process. The ignition mechanism of the second pulse is fundamentally different. As soon as the mixture fields of the first and the second pulse get into contact, a strained premixed flame between the mixture fields is established. The premixed flame propagates along the region of stoichiometric mixture towards the mixture field of the second pulse. This leads to a triggered ignition of the second pulse.
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