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Effect of the combustion chamber profile on the in-cylinder flow field in a direct injection Diesel engine


Autore: R. Carrozza, T. Donateo, D. Laforgia

Collana: CA - 61 - Perugia 2006

A numerical analysis of the intake phase of a four-valve direct-injection Diesel engine has been carried out with different combustion chambers.
The study has been performed without introducing any geometric simplification and by examining the simultaneous motion of the valves and the piston. The flow in the cylinder during the intake stroke has been simulated through the CFD code VECTIS, that includes the RNG K-ε model for the characterization of the turbulence. Experimental measures, acquired on the engine bench, and the results of the analysis, obtained with the 1D code WAVE, have been used as boundary conditions.
At the beginning of intake phase, the simulations gave evidence that a quite inhomogeneous motion of the air was produced by flow coming from valves. This flow expanded inside the cylinder and created a series of vortexes on the axial and
circumferential planes. The results confirmed that the combustion chamber geometry has little influence on the in-cylinder flow during both the intake stroke and the first part of the compression stroke. However, the bowl shape plays a significant role
near TDC by controlling both the ensemble-averaged mean and the turbulence velocity fields. The valves lift profile, necessary to plan their motion, has been designed according to a parametric profile.

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