Characteristics of the diesel sprays strongly influence ignition, combustion and pollutant formation in diesel engines. Due to the very high optical density of these sprays, the internal features, especially those near to the nozzle exit, have been considered in the past to be nonvisible. Thus the experimental efforts to decipher the internal structure and the breakup of the diesel sprays have been confronted with difficult challenges. The breakup of the diesel fuel sprays has been one of the most debated issues in diesel combustion. The interest in the breakup mechanism stems from the fact that the dynamics and the geometry of the dense core is a result of the jet breakup process, which controls the initial droplet size and velocity. The existence of a dense or intact liquid core region may favor higher soot formation rates due to rich mixtures and minimal air penetration. An overview of the round jet diesel spray breakup and the resulting spray structure is given. Current views on the internal structure, especially those on the nature of the dense core region, of the transient diesel spray are compared and the supporting evidence for these views is presented. The temporal and radial variations of the mean drop sizes in diesel sprays are also discussed.
Temporal structure of dense diesel sprays
1999
Conference paper
English
Structure of high-pressure diesel sprays
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