The authors present a method for the comdined employment of experimental information and CFD codes for the analysis of a multicylinder, turbocharged diesel engine. The method allows definition of proper initial conditions for the simulation of the in-cylinder processes during the closed valve period. A first set of examples compares the experimental data with those resulting from the employment of the KIVA3 numerical flow code (Amsden et al., 1989) with the assignment of initial thermodynamic conditions and gas composition derived from the experimental data. Also fuel injection data are entered in accordance with experiments. The analysis is extended to cases with significant EGR ratios in order to appreciate the sensitivity of the method to the variations in inlet gas conditions. The rather satisfactory results in the previous phase encouraged the authors to proceed with a further integration of their method with a ID flow code, which is able to simulate the whole engine and turbocharger systen. Interesting results are achieved when analyzing the EGR operated engine.
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