Journal
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
Volume 24, Issue 4, Pages 1578-1588Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/14680874221095235
Keywords
Pre-ignition; fuel-wall-interaction; LIF; secondary droplets; fuel jet
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This work conducts highly resolved optical investigations on the fuel-oil-film-interaction to characterize secondary droplets in direct injected engines. The results suggest that the detachment of secondary droplets caused by fuel injection in direct injected engines may affect pre-ignition events.
Since the technology of direct injected engines has become more and more prevalent, combustion anomalies such as pre-ignition events have been occurring with increasing frequency. The interaction between the fuel-spray and the oil wetted cylinder liner is considered to be a partial cause for these phenomena. The incoming fuel jet can lead to a detachment of secondary droplets, which may affect pre-ignition events due to their changed flammability properties. To characterize these secondary droplets, spatially and temporally highly resolved optical investigations on the fuel-oil-film-interaction are carried out in this work. Using laser induced fluorescence and two high-speed cameras both fluids are optically separated. Thereby the secondary droplets can be detected and characterized in size, velocity vector, and composition.
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