Browse Publications Technical Papers 2006-01-1365
2006-04-03

Potential of Narrow Angle Direct Injection Diesel Engines for Clean Combustion: 3D CFD Analysis 2006-01-1365

Future Diesel engines must comply with conflicting demands: more stringent emission standards and customer desire for “fun-to-drive” vehicles, i.e. higher torque and power output. Given such objectives, engine development investigates new clean combustion processes, such as low temperature combustion (LTC), highly premixed combustion (HPC) or homogeneous charge compression ignition (HCCI) combustion and the possibility to combine them with current solutions. Lately, IFP has developed a near zero NOx and particulate combustion process, the NADI concept, a dual mode engine application switching from a novel lean combustion process at part load to conventional Diesel combustion at full load.
Given the complex nature of these new combustion processes, the concept development relies increasingly on three-dimensional Computational Fluid Dynamics (CFD) tools as they help grasp the basic phenomena at stake and reduce development time and costs. The 3D CFD code used is briefly presented in this paper along with the latest evolutions of the physical submodels for injection, combustion, auto-ignition and liquid film modeling, which have greatly enhanced its use for the simulation of Diesel engines.
The use of the CFD tools for the development of various aspects of the NADI concept is presented. Joint optimization of the piston bowl geometry design and fluid motion illustrate the improvements made in terms of mixing and fresh charge usage at full load. A full load study of the sensitivity to wall wetting given the FIS configuration shows the capacity to detect liquid film formation and induced loss of power. Investigations on injection strategies allow to understand and define adequate strategies for very low NOx and soot combustion at part load. Finally the rapid transfer of the concept from passenger car to heavy duty applications is considered and the comparison of first test bench results with simulations is made.

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

Heavy Duty HCPC

2011-01-1824

View Details

TECHNICAL PAPER

Detailed Chemistry CFD Engine Combustion Solution with Ignition Progress Variable Library Approach

2009-01-1898

View Details

TECHNICAL PAPER

Study of In-Cylinder Combustion and Multi-Cylinder Light Duty Compression Ignition Engine Performance Using Different RON Fuels at Light Load Conditions

2013-01-0900

View Details

X