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The present work presents the results of 3D CFD combustion simulations of a current production 4-cylinder turbocharged Diesel engine using oxygen-enriched and humidified combustion air. Enriched Air (EA) is supposed to be produced by desorption from water, exploiting the different Henry constants of N 2  and O 2 . Simulation results show that EA permits to increase the engine thermal efficiency (up to 10%) and drastically reduces soot emissions but increases in-cylinder peak pressure and NO x  emissions. Combustion air humidification helps to reduce NO x  increment, without losing the advantage in terms of thermal efficiency and in soot reduction, even if NO x  emissions cannot be reported to the base case values.

Combustion analysis of a light duty diesel engine using oxygen-enriched and humidified combustion air