Browse Publications Technical Papers 2006-01-1382

Development of a Mixing and Combustion Zero-Dimensional Model for Diesel Engines 2006-01-1382

The aim of this work is to develop a combustion and emissions (NOx and soot) predictive tool that allows rapid parametric explorations of operating conditions and geometric configurations in diesel engines. This paper will present the mixing and combustion models used.
All the models are constructed around a spray-mixing model. This mixing model is based on the gaseous steady jets theory. The transient behavior description of the initial and final phases of the injection-combustion process is obtained from CFD studies. The mixing model allows the determination of the instantaneous local conditions of temperature and species mass fraction, used by the ignition, premixed and diffusion combustion models. The ignition and premixed combustion models are based on a simplification and parameterization of a complete n-heptane chemical kinetics description.
Some constants of the models are adjusted by a genetic algorithm with experimental information from different engines. The adjusted models are valid for a wide range of tested engines and operating conditions. Only one constant of the mixing model, mainly related to the nozzle characteristics, has to be adapted when the engine configuration changes (this is also applicable to any CFD model).
The result of the work is a practical tool that predicts with sufficient accuracy several engine operating parameters such as: combustion law, in-cylinder pressure evolution and gradient, available energy at the exhaust, etc. It also forms a good basis for the prediction of NOx and soot emissions. These predictions will be analyzed in future studies.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:

Soot Simulation under Diesel Engine Conditions Using a Flamelet Approach


View Details


Computational Chemistry Consortium: Surrogate Fuel Mechanism Development, Pollutants Sub-Mechanisms and Components Library


View Details


Numerical Study of Combustion Processes and Pollutant Formation in HSDI Diesel Engines


View Details