A Quasi-Dimensional NOx Emission Model for Spark Ignition Direct Injection (SIDI) Gasoline Engines University of Wisconsin-Madison

Format:

Conference/Event

Author/Creator:

Gong, Gong, author.

Contributor:

Rutland, Christopher

Conference Name:

SAE 2013 World Congress & Exhibition (2013-04-16 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2013

Summary:

A fundamentally based quasi-dimensional NOx emissionmodel for spark ignition direct injection (SIDI) gasoline engineswas developed. The NOx model consists of a chemicalmechanism and three sub-models. The classical extended Zeldovichmechanism and N₂O pathway for NOx formation mechanismwere employed as the chemical mechanism in the model. Acharacteristic time model for the radical species H, O and OH wasincorporated to account for non-equilibrium of radical speciesduring combustion. A model of homogeneity which correlatesfundamental dimensionless numbers and mixing time was developed tomodel the air-fuel mixing and inhomogeneity of the charge. Sincetemperature has a dominant effect on NOx emission, aflame temperature correlation was developed to model the flametemperature during the combustion for NOxcalculation.Measured NOx emission data from a single-cylinderSIDI research engine at different operating conditions was used tovalidate the NOx model. The effects of fuel injectiontiming, injection pressure, spark timing, overall engine AFR, andintake temperature on NOx emission were examined andwell captured by the model. Comparison of all the NOxemission data with the model indicates that the NOxmodel is a good predictive tool for NOx emissions inSIDI engines

Notes:

Vendor supplied data

Publisher Number:

2013-01-1311

Access Restriction:

Restricted for use by site license