Title: Quasi-linear versus filling and emptying modelling applied to the transient operation of a turbocharged diesel engine

Authors: Constantine D. Rakopoulos, Evangelos G. Giakoumis, Constantine N. Michos

Addresses: Internal Combustion Engines Laboratory, Department of Thermal Engineering, School of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechniou Street, Zografou Campus, Athens 15780, Greece. ' Internal Combustion Engines Laboratory, Department of Thermal Engineering, School of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechniou Street, Zografou Campus, Athens 15780, Greece. ' Internal Combustion Engines Laboratory, Department of Thermal Engineering, School of Mechanical Engineering, National Technical University of Athens, 9 Heroon Polytechniou Street, Zografou Campus, Athens 15780, Greece

Abstract: Predictions from a quasi-linear model of the transient operation of a turbocharged diesel engine are compared with results obtained from a more detailed, filling and emptying, non-linear code. An extended set of experimental tests under transient conditions has been carried out, which was used to evaluate the predictive capabilities of both models. These were mainly load acceptance tests that, nonetheless, constitute the most demanding cases for transient operation. The simplicity of the quasi-linear model, in combination with its low computational cost can prove, under certain circumstances, an interesting alternative to the engine researcher. This is particularly true if no detailed insight into the in-cylinder processes is required. For the latter, a more detailed analysis is needed as for example in zero-dimensional models.

Keywords: turbocharged diesel engines; transient operation; load acceptance tests; quasi-linear; filling modelling; emptying modelling; combustion; vehicle design.

DOI: 10.1504/IJVD.2007.013675

International Journal of Vehicle Design, 2007 Vol.45 No.1/2, pp.150 - 170

Published online: 11 May 2007 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article