This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Combustion System of a Lean-Burn Piston Engine with Catalytic Prechamber
Technical Paper
2001-01-1186
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Event:
SAE 2001 World Congress
Language:
English
Abstract
In the present work it is proposed to improve the efficiency of an Otto engine by development of a system with assisted catalytic ignition and combustion. The system is characterized by the use of a lean mixture in a swirling charge, substantial increase of the compression ratio, and application of a catalytic prechamber. For a long time, the combustion of lean mixtures has been one of the most important tendencies in development of gasoline engines. To be able to burn lean mixture at full load it is necessary to induce intense swirl in the combustion chamber and to increase compression ratio. One of the possible ways to burn lean homogeneous mixture is to use the combustion system made up of a main combustion chamber and prechamber. The latter is fed with the same lean homogenous mixture as the main combustion chamber, but it contains catalytic insert, kept at temperatures high enough, to secure catalytic reactions and torch ignition of the main charge. The combustion system was applied to four cylinder Diesel engine Ford FSD 425, with 2.5 l capacity, modified to the Otto cycle. Fuel injectors in the original engine were replaced with small prechambers. Each prechamber was equipped with catalytic insert and spark plug. The geometric compression ratio of the modified engine was ε = 16. A high swirling ratio was preserved from the original engine. After preliminary tests and series of succeeding improvements the engine started to work in optimum conditions. The modified Otto engine reached the original level of power 46,5 kW, at 4000 RPM., and original specific fuel consumption 254 g/kWh, at 2100 RPM. It worked more than 300 h. A small prechamber with the catalytic insert attached to the engine structure improved considerably the combustion characteristics, thus making possible operation with lean mixtures, at high compression ratio and high efficiency. It was found in experiments that catalytic ignition either can accompany spark ignition or it can be used as independent source of ignition. In both cases it increases the fuel economy and reduces emission of CO, HC and NOx, in comparison with pure spark ignition.
Recommended Content
Authors
Topic
Citation
Jarosinski, J., Lapucha, R., Mazurkiewicz, J., and Wojcicki, S., "Combustion System of a Lean-Burn Piston Engine with Catalytic Prechamber," SAE Technical Paper 2001-01-1186, 2001, https://doi.org/10.4271/2001-01-1186.Also In
References
- Takagi Y. “A New Era in Spark-Ignition Engines Featuring High-Pressure Direct Injection” Twenty-Seventh Symposium (International) on Combustion The Combustion Institute 2055 2068 1998
- Kuwahara K. Ueda K. Ando H. “Mixing Control Strategy for Engine Performance Improvement in a Gasoline Direct Injection Engine” SAE Technical Paper 980158 1998
- Zhao F. Lai M. C. Harrington D. L. “Automotive Spark-Ignited Direct-Injection Gasoline Engines” Progress in Energy and Combustion Science 25 437 562 1999
- May M. S. Spinnler F. 6 39 243 246 1978
- Overington M. T. “Gasoline Engine Combustion - The High Ratio Compact Chamber” SAE Technical Paper Series 820166 1982
- Gryglewski W. “Influence of Rotation Rate on Combustion in Spark Ignition Engine” Lodz, Poland 1995
- Gorczakowski A. Jarosinski J. “The phenomena of Flame Propagation in a Cylindrical Combustion Chamber with a Swirling Mixture” SAE Technical Paper Series, 2000-01-0195 2000
- Jarosinski J. Lapucha R. Mazurkiewicz J. Wojcicki S. “Investigation of a Lean-Burn Piston Engine with Catalytic Prechamber” SAE Technical Paper Series 960083 1996
- Jarosinski J. Lapucha R. Mazurkiewicz J. “Combustion in a Lean-Burn Piston Engine with Catalytic Prechamber” 4th Asian-Pacific International Symposium on Combustion and Energy Utilization December 8-11 1997 Bangkok, Thailand 913 918 1997
- Mazurkiewicz J. “Catalytically-Aided Combustion System Applied to Spark Ignition Engines” Technical University of Lodz Lodz June 2000
- Ferguson C. R. “Internal Combustion Engines” John Willey & Sons 1986