Modello termodinamico per la previsione delle prestazioni di motori alimentati a CNG

Performance Prevision of a Turbocharged Natural Gas Fuelled S.I. Engine

Natural gas represents today maybe the most valid alternative to conventional fuels for road vehicles propulsion. The main constituent of natural gas, methane, is characterized by a high autoignition temperature, which makes the fuel highly resistant to knocking: this allows a considerable downsizing of the engine by means of supercharging even under high compression ratio. Starting from these considerations, the authors realized a thermodynamic model of a 4-cilynder s.i. engine for the prevision of in-cylinder pressure, employing a two-zone approach for the combustion and adding sub-models to account for gas properties change and knocking occurrence. An extensive experimental campaign has …

Valutazione della posizione del picco di pressione in camera di combustione mediante analisi della velocità angolare