This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Investigation of Augmented Mixing Effects on Direct-Injection Stratified Combustion
Technical Paper
2001-01-3670
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
Spring Fuels & Lubricants Meeting & Exhibition
SAE International Fall Fuels & Lubricants Meeting & Exhibition
Language:
English
Abstract
The effects of augmented mixing through the use of an auxiliary gas injection (AGI) were investigated in a direct-injection gasoline engine operated at a 22:1 overall air-fuel ratio, but with retarded injection timing such that the combustion was occurring in a locally rich mixture as evident by the elevated CO emissions. Two AGI gas compositions, nitrogen and air, were utilized, the gas supply temperature was ambient, and a wide range of AGI timings were investigated. The injected mass was less than 10% of the total chamber mass. The injection of nitrogen during the latter portion of the heat release phase resulted in a 25% reduction in the CO emissions. This reduction is considered to be the result of the increased mixing rate of the rich combustion products with the available excess air during a time when the temperatures are high enough to promote rapid oxidation. This CO reduction was achieved despite the fact that the injected gas had a low temperature and was inert, both attributes should result in reduced oxidation rates. The effect of temperature and composition were observed by a significant reduction in the NOx emissions at the same conditions, confirming that the AGI orientation was effecting changes in the high temperature in-cylinder processes. At the same conditions air AGI (i.e an oxidizing gas) produced a more significant CO reduction, and the oxygen content counteracted the low temperature to cause no change in the NOx emissions. These findings suggest that a lack of late-cycle mixing limits the emissions potential of current direct-injection engines.
Recommended Content
Authors
Topic
Citation
McGuire, B. and Ghandhi, J., "Investigation of Augmented Mixing Effects on Direct-Injection Stratified Combustion," SAE Technical Paper 2001-01-3670, 2001, https://doi.org/10.4271/2001-01-3670.Also In
References
- EPA Regulation Federal Register 61 194 October 1996
- Morikawa, K. Takimoto, H. Kaneko, T. Ogi, T. “A study of Exhaust Emission Control for Direct Fuel Injection Two-stroke Engine” SAE Technical Paper Series, paper number 1999-01-3287 Society of Automotive Engineers Warrendale, PA 1999
- Johnson, D. E. Wong, H. “Electronic Direct Fuel Injection System Applied to an 1100cc Two-Stroke Personal Watercraft Engine” SAE Technical Paper Series, paper number 980756 Society of Automotive Engineers Warrendale, PA 1998
- Duret, P. Ecomard, A. Audinet, M. “A New Two- Stroke Engine with Compressed-Air Fuel Injection for High Efficiency Low Emissions Applications” SAE Technical Paper Series, paper number 880176 Society of Automotive Engineers Warrendale, PA 1988
- Schapertons, H. Emmenthal, K. D. Grabe, H. J. Oppermann, W. “VW's Gasoline Direct Injection (GDI) Research Engine” SAE Technical Paper Series, paper number 910054 Society of Automotive Engineers Warrendale, PA 1991
- Zhao, F. Lai, M. -C. Harrington, D. L. “Automotive spark ignited direct-injection gasoline engines” Progress in Energy and Combustion Science 25 5 437 562
- Turns, S. R. An Introduction to Combustion-Concepts and Applications Mc-Graw Hill New York 1996
- Blumberg, P. N. “Nitric Oxide Emissions from Stratified Charge Engines: Prediction and Control” Combustion Science and Technology 8 5 24 1973
- Casarella, M. V. Ghandhi, J. B. “Emission Formation Mechanisms in a Two-Stroke Direct-Injection Engine” SAE Technical Paper Series, paper number 982697 Society of Automotive Engineers Warrendale, PA 1998
- Dec, J.E. “A Conceptual Model of DI Diesel Combustion Based on Laser-Sheet Imaging,” SAE Paper 970873 1997
- Choi, C. Y. Foster, D. E. “In-Cylinder Augmented Mixing Through Controlled Gaseous Jet Injection” SAE Technical Paper Series, paper number 952358 Society of Automotive Engineers Warrendale, PA 1995
- Kurtz E. M. Foster, D. E. “Exploring the Limits of Improving DI Diesel Emissions by Increasing In-Cylinder Mixing” SAE Technical Paper Series, paper number 982677 Society of Automotive Engineers Warrendale, PA 1998
- Mather, D. K. Reitz, R. D. “Modeling the Effects of Auxiliary Gas Injection on Diesel Engine Combustion and Emissions” SAE Technical Paper Series, paper number 2000-01-0657 Society of Automotive Engineers Warrendale, PA 2000
- Yamaura, K.T. et al. A Study for Reducing Diesel Exhaust Emission by Gas Injection (1 st Report: Reduction of Black Smoke by Combustible Gas Injection) 8 th International Combustion Engine Symposium Japan 123 129 134 1990