A multidimensional simulation of Auxiliary Gas Injection (AGI) for late cycle oxygen enrichment was exercised to assess the merits of AGI for reducing the emissions of soot from heavy duty diesel engines while not adversely affecting the NOx emissions of the engine. Here, AGI is the controlled enhancement of mixing within the diesel engine combustion chamber by high speed jets of air or another gas. The engine simulated was a Caterpillar 3401 engine. For a particular operating condition of this engine, the simulated soot emissions of the engine were reduced by 80% while not significantly affecting the engine-out NOx emissions compared to the engine operating without AGI. The effects of AGI duration, timing, and orientation are studied to confirm the window of opportunity for realizing lower engine-out soot while not increasing engine out NOx through controlled enhancement of in-cylinder mixing. These studies have shown that this window occurs during the late combustion cycle, from 20 to 60 crank angle degrees after top-dead-center. During this time, the combustion chamber temperatures are sufficiently high that soot oxidation increases in response in increased mixing, but the temperature is low enough that NOx reactions are quenched. The effect of the oxygen composition of the injected air is studied for the range of compositions between 21% and 30% oxygen by volume. This is the range of oxygen enrichment that is practical to produce from an air separation membrane. Simulations showed that this level of oxygen enrichment is insufficient to provide an additional benefit by either increasing the level of soot oxidation or prolonging the window of opportunity for increasing soot oxidation through enhanced mixing.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Modeling the Effects of Late Cycle Oxygen Enrichment on Diesel Engine Combustion and Emissions


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2002 World Congress & Exhibition ; 2002



    Publication date :

    2002-03-04




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Effects of oxygen enrichment and fuel emulsification on diesel engine performance and emissions

    Sekar,R.R. / Marr,W.W. / Cole,R.L. et al. | Automotive engineering | 1991


    Simulation Analysis of Early and Late Miller Cycle Strategies Influence on Diesel Engine Combustion and Emissions

    Liu, Haifeng / Yang, Shuai / Yang, Xiaolin et al. | SAE Technical Papers | 2020


    Modeling the Effects of Auxiliary Gas Injection on Diesel Engine Combustion and Emissions

    Mather, D. K. / Reitz, Rolf D. | SAE Technical Papers | 2000


    Modeling the effects of auxiliary gas injection on diesel engine combustion and emissions

    Mather,D.K. / Reitz,R.D. / Univ.of Wisconsin-Madison,US | Automotive engineering | 2000


    Three dimensional modeling of diesel engine intake flow, combustion and emissions

    Reitz,R.D. / Rutland,C.J. / Univ.of Wisconsin-Madison,US | Automotive engineering | 1995