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Effects of Direct Water Injection on DI Diesel Engine Combustion
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 16, 2000 by SAE International in United States
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The effects of in-cylinder water injection on a direct injection (DI) Diesel engine were studied using a computational fluid dynamics (CFD) program based on the Kiva-3v code. The spray model is validated against experimental bomb data with good agreement for vapor penetration as a function of time. It was found that liquid penetration increased approximately 35% with 23% of the fuel volume replaced by water, due mostly to the increase in latent heat of vaporization.
Engine calculations were compared to experimental results and showed very good agreement with pressure, ignition delay and fuel consumption. Trends for emissions were accurately predicted for both 44% and 86% load conditions. Engine simulations showed that the vaporization of liquid water as well as a local increase in specific heat of the gas around the flame resulted in lower Nitrogen Oxide emissions (NOx) and soot formation rates. Using stratified fuel-water injection increases soot at 86% loads due in part to late injection. Because NOx decreased at all loads, the injection timing can be advanced to minimize fuel consumption and soot.
CitationBedford, F., Rutland, C., Dittrich, P., Raab, A. et al., "Effects of Direct Water Injection on DI Diesel Engine Combustion," SAE Technical Paper 2000-01-2938, 2000, https://doi.org/10.4271/2000-01-2938.
- Amsden, A. A. O'Rourke, P. J. Butler, T. D. “KIVA--II: A Computer Program for Chemically Reactive Flows with Sprays” Los Alamos National Laboratory Report No. LA-11560-MS 1989
- Curran, H. J. Gaffure, P. Pitz, W. J. Westbrook, C. K. “A Comprehensive Modeling Study of N-Heptane Oxidation,” Combustion and Flame 114 149 177 1998
- Dittrich, P. Wirbeleit, F. Willand, J. Binder, K. “Multi-Dimensional Modeling of the Effect of Injection Systems on DI Diesel Engine Combustion and NO-Formation” SAE 982585 1998
- Han, Z. Uludogan, A. Hampson, G.J. Reitz, R. D. “Mechanism of Soot and NOx Emission Reduction Using Multiple--Injection in a Diesel Engine” SAE 960633 1996
- Kazakov, A. Foster, D. “Modeling of Soot Formation During DI Diesel Combustion Using a Multi-Step Phenomenological Model” SAE 982463 1998
- Patterson, M.A. Kong, S.C. Hampson, G.J. Reitz, R. D. “Modeling the Effects of Fuel Injection Characteristics on Diesel Engine Soot and NOx Emissions” SAE 940523 1994
- Reitz, R. D. “Modeling Atomization Processes in High--Pressure Vaporizing Sprays” Atomization and Spray Technology 3 1987
- Rutland, C.J. Eckhause, J. Hampson, G. Hessel, R. Kong, S. Patterson, M. Pierpont, D. Sweetland, P. Tow T. Reitz, R. D. “Toward Predictive Modeling of Diesel Engine Intake Flow, Combustion, and Emissions” SAE 941897 1994
- Renner, G. Maly, R.R. “Moderne Verbrennungsdiagnostik fur die dieselmotorische Verbrennung, in Dieselmotorentechnik” 98 Expert Verlag Essers U. 1998
- Takasaki, K. “Improvement of Diesel Combustion with Stratified Fuel/Water Injection System” MTZ Motortechnische Zeitschrift 59 1988
- Schwarz, V. König, G. Dittrich, P. Binder, K. “Analysis of Mixture Formation, Combustion and Pollutant Formation in HD Diesel Engines using Modern Optical Diagnostics and Numerical Simulation” SAE 1999-01-3647 1999
- Wirbeleit, F. Enderle, CH. Lehner, W. Raab, A. Binder, K. “Stratified Diesel Fuel--Water--Diesel Fuel Injection Combined with EGR -- The Most Efficient In--Cylinder NOx and PM Reduction Technology” SAE 972962 1997