Numerical modeling of next generation engines (HCCI)

 

Abstract

HCCIThe increasing attention for the environmental issues has been leading the major automotive manufacturers to look for new solutions with the aim of reducing pollutants emissions arising from internal combustion engines. In this context, the Homogeneous Charge Compression Ignition (HCCI) technology plays a leading role, thanks to the lower fuel consumption and the cleaner combustion obtained. The characteristics ignition mechanism of this engine, based on the autoignition of the charge, gives to kinetic a fundamental role in the description of the phenomena involved in the combustion. Therefore, the optimization of these systems requires the use of detailed kinetic schemes, and also of models able to describe with good accuracy temperature and pressure profiles inside the combustion chamber. From the numerical point of view, a robust, precise and fast ODE/DAE solver is required.

The aim of the work is the general improvement of the model, by the introduction of new and more reliable sub-models for the description of the thermo-fluid dynamics of the system, with particular attention for the effects of the Exhaust Gas Recirculation (EGR), the volumetric coefficients and the mechanism of thermal exchange. It is also necessary to reduce the time for solution, by introducing faster solver and using parallelization techniques. Finally, kinetics studies based on the rate of production and reaction fluxes analysis can improve the understanding of the overall combustion process in HCCI engines and suggest new control strategies.

 

Details

Duration: 10-12 months

Experimental activities: no

Skills: transport phenomena, fundamentals of combustion, fundamentals of chemical kinetics

People involved: Tiziano Faravelli, Mattia Bissoli

Contacts: Tiziano Faravelli