Accuracy of Diesel Engine Performance Prediction -Numerical Versus Experimental

Abstract

The paper presents two performance characteristics of diesel engines in the process of design for a vehicular use - effective power and torque curves, at full load, versus speed. A comparison is done between a numerical prediction indicated in literature and experimental data enclosed in engine certification standards. For two types of engines manufactured in series, it was assessed the accuracy of the numerical predictions of power and torque during air induction system evolution, from naturally aspirated to turbocharging and, finally, to charge air intercooling. Discussions are made on the best fit and accuracy, showing that the polynomial prediction for design purposes is still reliable.