Ultra-lean burn conditions (? > 1.8) is seen as a way for improving efficiency and reducing emissions of spark-ignition engines. It raises fundamental issues in terms combustion physics its modeling, among which the significant reduction laminar flame speeds increase thickness, well an increased sensitivity to local fuel/air equivalence ratio variations are essential be accounted compared conve...

A correct prediction of the ignition process represents a fundamental pre-requisite for a successful CFD simulation of combustion SI engines. Ignition involves many scales, physical and chemical phenomena that need to be described in detail. Within this context, the authors developed a Lagrangian model that can be used to predict the first stages of the combustion process in SI engines, when th...

Lean fueling of spark ignited (SI) engines is a valid method for increasing efficiency and reducing nitric oxide (NOx) emissions. Gasoline direct injection (GDI) allows better fuel economy with respect to the port-fuel injection configuration, through greater flexibility to load changes, reduced tendency to abnormal combustion, and reduction of pumping and heat losses. During homogenous charge ...

Marine emission policies are becoming more demanding; thus, ship propulsion and power generation technologies need to be adapted current scenarios. LNG is already considered a transition fuel, new alternative marine fuels emerging. The aim of this study was develop an innovative methodology optimize adapt the combustion system internal engine burn fuels. present based on LBG, but could replicat...