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.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Optimization of a Large Diesel Engine via Spin Spray Combustion*


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2005 World Congress & Exhibition ; 2005



    Publication date :

    2005-04-11




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Optimization of a large diesel engine via spin spray combustion

    Bergin,M.J. / Hessel,R.P. / Reitz,R.D. et al. | Automotive engineering | 2005


    Modeling Diesel Engine Spray Vaporization and Combustion

    Gonzalez D., Manuel A. / Reitz, Rolf D. / Lian, Zhi W. | SAE Technical Papers | 1992


    Modeling diesel engine spray vaporization and combustion

    Gonzalez,M.A. / Lian,Z.W. / Reitz,R.D. et al. | Automotive engineering | 1992