Abstract
Droplet evaporation and liquid/vapor-phase interactions in a diesel spray are complex processes which have been stressed as controlling factors in the mixture formation and in the ignition and subsequent combustion in a diesel engine. To understand diesel combustion, we must comprehend these processes, especially the quantitative factors of fuel vapor concentration in the spray. Fuel concentration in a diesel spray has recently been studied using pulsed-laser holographic interferometry [1] and image analysis of shadow photographs [2]. However, the subjects in these studies were a highly volatile fuel spray which could be treated as a gas jet and a diesel fuel spray at room-temperature and high-pressure containing a negligible amount of fuel vapor. Such experimental conditions were for the purpose of avoiding any number of difficulties in analyzing the experimental data. One of the difficulties was to extract the fuel vapor concentration from the total fuel concentration, since both fuel droplets and vapor exist in the actual diesel spray at high-pressure and high-temperature.
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