Abstract
This paper describes the effect of fuel injection rate shaping on spray combustion. Injection rate shaping with different slope of injection rate rise and drop were examined by using the electronically controllable fuel injection system. The effect on combustion characteristics, i.e., the ignition delay and combustion periods, were investigated through the light emission from spray flame. Two-dimensional temperature and soot distributions in flame were measured by the two color method. The steeper slope of injection rate rise develops the flame evolution in the direction of spray axis and width and cause the earlier start of main combustion. This tendency results in a larger area of high temperature region in flame from initial stage of combustion. The steeper slope of injection rate rise increases total and average soot productions in flame at initial stage of combustion in spite of the enhanced spray formation.
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