Abstract
Effect of fumigated fuel on an initial combustion stage of a diesel spray injected into a D. I. diesel engine was studied by measuring an ignition delay period and rate of heat release. Methanol and diesel fuel itself were used as a sub-fuel fumigated into an intake air at an intake manifold. Main results are as follows:(1) An ignition delay period as a function of an in-cylinder gas temperature is slightly shortened by the methanol fumigation except an ignition prompted by self-ignition of methanol. However, for the diesel fumigation, the ignition delay decreases with an increase of the fumigated quantity.(2) The ignition delay period affected by fumigated diesel fuel is shorter than that affected by methanol at the same fumigation equivalence ratio and intake temperature.(3) A rapid combustion occurs with the methanol fumigation, while, the diesel fuel fumigation slightly changes the heat release caused by combustion of a main spray. The maximum rate of the heat release in the initial combustion stage increases rapidly with an increase in methanol fumigation. For the fumigated diesel fuel, the maximum rate of the heat release changes little.
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