Analyses of the Diesel Combustion Process Based on Varying Delay Mechanism : Second Report, Effect of Pilot Injection

概要

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In order to have a better understanding of the effect of pilot injection, the influence of the waveform of injection rate on the course of heat release during the earlier stages of combustion has been studied theoretically, based on the theory of combustion knock presented earlier in the first report. A systematic calculation shows that the pilot fuel injected prior to the main injection can minimize the peak rates of heat release and of pressure rise, if correct pilot quantity and timing are given. This effect is attributed to the decreased ignition delay of the main fuel associated with the fact that the pilot charge preheats the burning zone. The result of calculation further shows that the pilot fuel should be kept least but much enough to reduce the ignition delay of the man fuel, otherwise a high rate of heat release would arise from the pilot fuel itself.
一般社団法人日本機械学会の論文