2004 年 39 巻 9 号 p. 648-654
The rate of heat release in the experiment was simulated using a numerical computation code (KIVA-3V), and the combustion process was inferred from the spatial distribution of the temperature and of the fuel and oxygen concentrations in the combustion chamber. Results confirmed that covering the nozzle positioned downstream in the noz-zle-array with the burned gas causes the first peak in the rate of heat release in a multi-nozzle, side injection diesel engine. The second peak in the rate of heat release is related to the ratio between the injection period and the period from the injection start timing to first peak time. Swirl flow is a dominant factor in the profile of heat release rate, because swirl momentum, rather than injection momentum, strongly affects the tip penetration of flame jet.