Optimization of a Large Diesel Engine via Spin Spray Combustion *

2005-01-0916

04/11/2005

Event
SAE 2005 World Congress & Exhibition
Authors Abstract
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/2005-01-0916
Pages
17
Citation
Bergin, M., Hessel, R., and Reitz, R., "Optimization of a Large Diesel Engine via Spin Spray Combustion *," SAE Technical Paper 2005-01-0916, 2005, https://doi.org/10.4271/2005-01-0916.
Additional Details
Publisher
Published
Apr 11, 2005
Product Code
2005-01-0916
Content Type
Technical Paper
Language
English