Development of a Novel Combustion System for Emissions Reduction

Authors

Dipl.-Ing. Massimo Medda, Dipl.-Ing. Lucio Calogero, Dipl.-Ing. Matteo Cucchi, Dr.-Ing. Stefano Paltrinieri, Dipl.-Ing. Vincenzo Rossi,
Ferrari, Maranello

Summary

Complying with more and more restrictive gaseous emissions limits is an increasingly arduous task, notably for high-performance engines for sports car applications.

Large displacement engines call for a reduction of specific emissions. On the one hand, though, the high-revving nature of the engine, together with the high specific power levels, entails an increment of frictional losses at low engine speeds which limits the available exhaust gas enthalpy; on the other, flow-capacity oriented intake ports and a limited stroke-to-bore ratio, which are high-performance enabling contents, have significant drawbacks on the charge motion quality. Furthermore, high flow rate injectors limit the degrees of freedom in spray pattern layout, and precise injection controllability of low amounts of fuel becomes an issue. Additionally, high specific power levels are achieved with growing turbochargers and catalytic converters sizes. All these features bring about an increment in light-off time.

Within this scenario, an optimisation of the combustion system becomes mandatory with a twofold objective:

• Reduction of specific emissions
• Maximisation of exhaust gas enthalpy

This paper presents the results of the development of a combustion system aimed at achieving the targets above.

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