* "/> * " />
Browse Publications Technical Papers 2005-01-0916
2005-04-11

Optimization of a Large Diesel Engine via Spin Spray Combustion * 2005-01-0916

A numerical simulation and optimization study was conducted for a medium speed direct injection diesel engine. The engine's operating characteristics were first matched to available experimental data to test the validity of the numerical model. The KIVA-3V ERC CFD code was then modified to allow independent spray events from two rows of nozzle holes. The angular alignment, nozzle hole size, and injection pressure of each set of nozzle holes were optimized using a micro-genetic algorithm. The design fitness criteria were based on a multi-variable merit function with inputs of emissions of soot, NOx, unburned hydrocarbons, and fuel consumption targets. Penalties to the merit function value were used to limit the maximum in-cylinder pressure and the burned gas temperature at exhaust valve opening.
The optimization produced a 28.4% decrease in NOx and a 40% decrease in soot from the baseline case, while giving a 3.1% improvement in fuel economy. The improvements were found to be due to the formation of circulatory flows caused by the interaction of adjacent optimally timed injections. The resulting spinning flow field greatly enhances mixing and combustion rates, and is called “Spin-Spray Combustion*”. The resulting fast mixing allowed the use of retarded injection timings, thereby lowering NOx production without increasing soot beyond the target values.

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

Combustion Noise Prediction in a Small Diesel Engine Finalized to the Optimization of the Fuel Injection Strategy

2009-01-2077

View Details

TECHNICAL PAPER

Direct Injection Diesel Engine Soot Modeling: Formulation and Results

940670

View Details

TECHNICAL PAPER

Thermo-Fluid Dynamic Modeling and Experimental Investigation of a Turbocharged Common Rail DI Diesel Engine

2005-01-0689

View Details

X