Browse Publications Technical Papers 2001-01-3645

Fuel Distribution and Combustion Characteristics in a Direct-Injection, Spark-Ignited (DISI) Engine Under Stratified Operation 2001-01-3645

The characteristics of the combustion process in direct-injected, spark-ignited (DISI), stratified-operation engines, are intimately related to the fuel distribution in the combustion chamber. Engine performance, and particularly emissions of hydrocarbons, nitric oxides and particulate matter are strongly dependent on the manner in which the fuel charge is distributed. The present paper investigates the fuel distribution and combustion characteristics of a side-injected DISI engine under stratified operation and late injection, using optical diagnostics without compromising on the use of a realistic bowl geometry. Laser-induced fluorescence, laser-induced elastic scatter and color and luminosity visualization are employed to identify the relationship between fuel distribution and combustion characteristics. The results show that the mixture is strongly stratified, with combustion starting primarily in the fuel-lean to stoichiometric region surrounding the spark, followed by propagation into fuel-rich zones. Intense soot luminosity and particulate matter is observed in the fuel rich regions close to the piston throughout the expansion stroke.


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


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.

Due to current capacity constraints, printed versions of our publications - including standards, technical papers, EDGE Reports, scholarly journal articles, books, and paint chips - may experience shipping delays of up to four to six weeks. We apologize for any inconvenience.
We also recommend:

Liquid Fuel Impingement on the Piston Bowl of a Direct-Injection, Spark-Ignited (DISI) Engine under Stratified Operation


View Details


Analysis of Tumble and Swirl Motions in a Four-Valve SI Engine


View Details


Equivalence Ratio Distributions in a Light-Duty Diesel Engine Operating under Partially Premixed Conditions


View Details