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A model for the prediction of combustion and exhaust emissions of DI diesel engines has been formulated and developed. This model is a quasi-dimensional phenomenological one and is based on multi-zone combustion modelling concept. It takes into consideration, on a zonal basis, details of fuel spray formation, droplet evaporation, air-fuel mixing, spray wall interaction, swirl, heat transfer, self ignition and rate of reaction. The emission model uses the chemical equilibrium, as well as the kinetics of fuel, NO, CO and soot reactions in order to calculate the pollutant concentrations within each zone and the whole of cylinder. The accuracy of prediction versus experimental data and the capability of the model in predicting engine heat release, cylinder pressure and all the major exhaust emissions on both zonal and cumulative basis, is demonstrated.

Experimental data and analytical techniques are used to study the trade-offs between emissions and performance for a turbocharged, intercooled HSDI diesel engine equipped with an electronically controlled exhaust gas recirculation (EGR) system. Measured data are used to support a thermodynamically based cycle simulation comprising a multi-zone combustion and emission model. The simulation is used to investigate the effects of various key parameters including fuel injection equipment (FIE) on engine performance and emissions.