3D CFD analyses are used to analyse the effects of port-injection of water in a high performance turbocharged GDI engine. Particularly, water injection is adopted to replace mixture enrichment while preserving, if not improving, indicated mean effective pressure and knock resistance. A full-load / maximum power engine operation of a currently made turbocharged GDI engine is investigated comparing the actual adopted fuel-only rich mixture to stoichiometric-to-lean mixtures, for which water is added in the intake port under constant charge cooling in the combustion chamber. In order to find the optimum fuel/water balance, preliminary analyses are carried out using a chemical reactor to evaluate the effects of charge dilution and mixture modification on both autoignition delays and laminar flame speeds. Thanks to the lower chemical reactivity of the diluted end gases, the water-injected engine allows the spark advance (SA) to be increased; as a consequence, engine power target is met, or even crossed, with a simultaneous relevant reduction of fuel consumption.

A numerical investigation on the potentials of water injection to increase knock resistance and reduce fuel consumption in highly downsized GDI engines / Berni, Fabio; Breda, Sebastiano; Lugli, Mattia; Cantore, Giuseppe. - In: ENERGY PROCEDIA. - ISSN 1876-6102. - 81:(2015), pp. 826-835. (Intervento presentato al convegno 69th Conference of the Italian Thermal Engineering Association, ATI 2014 tenutosi a ita nel 2014) [10.1016/j.egypro.2015.12.091].

A numerical investigation on the potentials of water injection to increase knock resistance and reduce fuel consumption in highly downsized GDI engines

Berni, Fabio;Breda, Sebastiano;Cantore, Giuseppe
2015

Abstract

3D CFD analyses are used to analyse the effects of port-injection of water in a high performance turbocharged GDI engine. Particularly, water injection is adopted to replace mixture enrichment while preserving, if not improving, indicated mean effective pressure and knock resistance. A full-load / maximum power engine operation of a currently made turbocharged GDI engine is investigated comparing the actual adopted fuel-only rich mixture to stoichiometric-to-lean mixtures, for which water is added in the intake port under constant charge cooling in the combustion chamber. In order to find the optimum fuel/water balance, preliminary analyses are carried out using a chemical reactor to evaluate the effects of charge dilution and mixture modification on both autoignition delays and laminar flame speeds. Thanks to the lower chemical reactivity of the diluted end gases, the water-injected engine allows the spark advance (SA) to be increased; as a consequence, engine power target is met, or even crossed, with a simultaneous relevant reduction of fuel consumption.
2015
69th Conference of the Italian Thermal Engineering Association, ATI 2014
ita
2014
81
826
835
Berni, Fabio; Breda, Sebastiano; Lugli, Mattia; Cantore, Giuseppe
A numerical investigation on the potentials of water injection to increase knock resistance and reduce fuel consumption in highly downsized GDI engines / Berni, Fabio; Breda, Sebastiano; Lugli, Mattia; Cantore, Giuseppe. - In: ENERGY PROCEDIA. - ISSN 1876-6102. - 81:(2015), pp. 826-835. (Intervento presentato al convegno 69th Conference of the Italian Thermal Engineering Association, ATI 2014 tenutosi a ita nel 2014) [10.1016/j.egypro.2015.12.091].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1176720
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