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Proceedings of the Seventh International Conference on Liquid Atomization and Spray Systems

ISBN Druckformat: 89-950039-2-8

Spray Characteristics of an Intermittent Air-Assisted Fuel Injector


Spray characteristics of an intermittent air-assisted fuel injector for a 4-stroke gasoline direct injection engine was investigated using a TV image system. The spatial spray structures were acquired in terms of Sauter Mean Diameter(D32) and liquid mass concentration. Air entrainment motion was observed just below the poppet valve. The influence of parameters such as ambient air density, supply pressure, and injected Air-Liquid mass Ratio(ALR) were examined. D32 varied from 9 to 30µm throughout all experimental conditions. The result exhibited a similar tendency to those from diesel injectors in spray tip penetration and atomization characteristics. Drop-size distributions of sprays from the AAFI were almost identical to all experimental conditions. The best-fitting curve appeared to be log-Bolzman function.
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