engleski

Modelling and simulation of pollutant formation in diesel engines

A great amount of pollutants that affect human health and the environment are released by the use of diesel engines. Some of the pollutants emitted by the combustion of diesel fuel are NOx, soot, CO and HC. These emissions contribute to the formation of acid rain, global warming, depletion of the stratospheric ozone, and photochemical smog, which can be linked to a variety of respiratory and cardiovascular symptoms and illnesses. These pollutants have been regulated for over several decades, and even more stringent regulations are expected within the next years. Numerous investigations are used to determine how various factors such as the engine design, fuel injection, fuel-air mixing, and combustion influence the emission of these pollutants. The understanding of these complex processes in experimental investigations is limited, and can be significantly improved by the use of numerical modelling and computer simulations. Computer simulation tools, such as Computational Fluid Dynamics (CFD), has become a valuable tool that can be used to improve efficiency of combustion systems and to reduce high cost and time-consuming experimental investigations in modern engineering development processes of diesel engines. This paper presents modelling and simulation of pollutant emissions in diesel engine by the use of AVL’s CFD solver FIRE. The paper also provides an insight into the mathematical models used for the calculations of the emissions. Several simulations were carried out on a real-case engine and the results were compared with available experimental data.

Diesel engine; Diesel combustion; Spray process; Modelling pollutants

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