Browse Publications Technical Papers 2014-01-1142
2014-04-01

Estimation of Particulate Matter in Direct Injection Gasoline Engines by Non-Combustion CFD 2014-01-1142

A technique of estimating particulate matter (PM) from gasoline direct injection engines is proposed that is used to compute mass density and particle number density of PM by using fuel mass in rich mixtures obtained by using non-combustion computational fluid dynamics (CFD).
The CFD code that was developed by the authors employed a Cartesian coordinates system as a discretization method and large eddy simulation (LES) as a turbulence model. Fuel spray droplets were treated with the discrete droplet model (DDM). The code was verified with some experimental data such as those obtained from in-cylinder gas-flows with a laser Doppler velocimeter (LDV) and in-cylinder fuel concentration with laser induced fluorescence (LIF).
PM emissions from a single-cylinder gasoline direct injection engine were measured with an electrical low pressure impactor (ELPI) to determine the model constants that were required in the estimation model. We confirmed that the technique could be applied to various engine operating conditions and fuel spray patterns. Because combustion-phase calculations are not required to estimate PM with the method, it has been a useful way of exploring optimum injection timing and/or spray specifications within short periods.
Split injection to reduce PM in a gasoline direct injection engine was investigated with the method. PM was significantly reduced with split-injection by optimizing the injection timing. However, the effect of reducing PM with split injection was greatly affected by the spray patterns. The reason for this was clarified by analyzing the simulation results.

SAE MOBILUS

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

Access SAE MOBILUS »

Members save up to 18% 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:
TECHNICAL PAPER

Comparative Evaluation of Engine Control Strategy on Regulated Emissions and Nano-Particle Characteristics of LPG Direct Injection (LPDI) Vehicle During the Cold Start and the Hot Phases in the FTP-75 Cycle

2014-01-1232

View Details

TECHNICAL PAPER

Numerical Investigation of the Effect of Spray Cone Angle on Mixture Formation and CO/Soot Emissions in an Early Injection HCCI Diesel Engine

2015-01-1070

View Details

JOURNAL ARTICLE

Cfd Diagnostic Methodology for the Assessment of Mixture Formation Quality in GDI Engines

2011-24-0151

View Details

X