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Multidimensional Modelling of Spray Impingement in Modern Diesel Engines
Technical Paper
2005-24-092
ISSN: 0148-7191, e-ISSN: 2688-3627
Sector:
Language:
English
Abstract
In modern DI diesel engines with high pressure injection
systems, the impingement of the spray on the piston head frequently
occurs. Being the mixture preparation a crucial aspect for the
correct operation of the engine, as it greatly influences and
alters the combustion process, numerical modelling of the
spray-wall interaction becomes essential.
Three different spray-wall interaction models have been tested
and integrated into a modified version of the KIVA-3V. All the
models conserve mass, momentum and energy of the impinging droplet
and have a different behavior if the surface is wet or dry. The
paper focuses on the main features of the single models,
investigating the different criteria used to define the splash
occurrence, the ratio of the splashed mass to the incident mass and
the splashed droplet size.
Comparisons with experimental data are presented. The effects of
the initial injection velocity and the spray cone angle are also
investigated.