Multidimensional modelling of the in-cylinder processes in a GDI engine

The study is focused on the assessment of a £D numerical model able to simulate the in-cylinder processes charcterizing the operation of GDI (gasoline direct injection) engine equipped with a high-pressure injector system. The Engine is experimentally characterized at the test bench. One of the 4 cylinders is modified to allow two optical accesses that leave unvaried the combustion chamber configuration and combustion processes. A sub-model of high portability allows simulating the spray dynamics, whose validation is made on the ground of experimental data collected with the injector mounted in a confined vessel. A preliminary study of the spray-wall impingement is also carried out, that allows better predicting the gasoline deposition and splashing phenomena.