Effect of Fuel Injection Rate Shaping and Injection Pressure on Intermittent Spray Combustion 2000-01-2793

The effects of fuel injection rate shaping and injection pressure on diesel combustion were investigated using an electronically controlled fuel injection system. An analysis of non-evaporating spray reveals that the rate of injection rate increase affects temporal spray evolution, and also that higher injection pressures enhance spray development, particularly in terms of spray width, for all modes of injection rate shaping. From photographs of spray flame and luminous flame radiation data, it is clarified that the enhancement of spray development significantly influences the growth of the spray flame in the initial stages of combustion and affects main combustion. The optimum mode of injection rate shaping, in terms of shortening the main combustion period, varies according to injection pressure.