Modeling of the Combustion Process in a Common Rail Diesel Engine for the Prediction of Noxious Emissions and Radiated Noise

CFD and acoustic numerical tools are assessed on the ground of test bench data to characterise the energetic performances and the environmental impact of a six-cylinder turbocharged diesel engine, equipped with a Common Rail Fuel Injection System. Data collected during the experimental campaign cover a broad range of operating conditions. The CFD approach regards both the development of a 1D model for the entire propulsion system, from the intake mouth to the exhaust ducts, and a 3D model for the in-cylinder thermo-fluidynamics accounting for the mixture formation and combustion processes. A in-house developed routine is developed for the prediction of the combustion noise. Experimental data are employed for the models tuning and as a term of comparison for the computed engine output.