Browse Publications Technical Papers 2002-01-0997
2002-03-04

Influence of Mixture Formation on Injection and Combustion Characteristics in a Compact GDI Engine 2002-01-0997

The spray characteristics are determining factors for the quality of mixture formation respectively for the combustion, when applying GDI. Their variation with load and speed is a basic criterion for the adaptability of an injection system type to an engine with known requirements. CFD models of the fluid flow dynamics, mixture formation and combustion are a determining condition for such adaptation. The paper presents the development results of a GDI four-stroke, four-valve, single cylinder engine. The pressure pulse injection system involved in this application is analyzed and presented from the fluid-dynamic behavior up to the obtained injection spray characteristics.
The mixture formation and combustion processes are simulated for different load and speed values, respectively for favorable combinations of parameters, such as the injection system configuration, the opening pressure of the applied mechanical injector and the injection duration.
Particular aspects of the combustion when using GDI, such as non-homogeneity of the mixture structure, super position of mixture formation and combustion and the influence of additional spark sources form an object of analysis. The results of numerical simulation are compared with the experimental 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

Correlation Concept Between Mixture Formation and Ignition Applied to a GDI High Speed Engine

2002-01-0833

View Details

TECHNICAL PAPER

Direct Injection for Future SI-Engines - Stand Alone Combustion Layout or Integrated Part of Multi-Function Fuel/Air Management Approach?

2003-01-0540

View Details

TECHNICAL PAPER

Effect of Octane Rating and Charge Stratification on Combustion and Operating Range with DI PCCI Operation

2007-01-0053

View Details

X