This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Parametric 1-D Modeling Study of a 5-Stroke Spark-Ignition Engine Concept for Increasing Engine Thermal Efficiency
Technical Paper
2015-01-1752
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
In recent years, there has been growing interest in alternative cycles to the standard 4-stroke Otto engine for improving efficiency and lowering emissions of spark-ignition engines. One proposed concept is the 5-stroke engine which uses two types of cylinders, a combustion cylinder and an expansion cylinder with a transfer port between them. Excess pressure in the combustion cylinder can be further expanded by using a second expansion cylinder to harness additional work. The expansion cylinder runs on a two-stroke cycle, allowing the use of two combustion cylinders to one expansion cylinder in a three cylinder configuration to increase efficiency. Previous work has investigated the performance of prototype 5-stroke engines compared to 1-D modeling results; none have conducted a thorough study on the interactions of various design parameters. In this paper, we explore the results of a 1-D parametric modeling study to examine the effect of various parameters such as bore, stroke, valve lift profiles, and compression ratio on engine brake thermal efficiencies of a three cylinder 5-stroke engine. Over the range of values examined our work indicates that an expansion cylinder bore to stoke ratio of 1.4 and expansion ratio 17.5 produces maximum brake thermal efficiency. The intake, transfer, and exhaust lift profiles have a strong effect on brake thermal efficiency with valve opening and closing points playing a key role. Additionally reducing the offset between the combustion and expansion cylinder improves the timing of the transfer process leading to improved brake thermal efficiency. Lastly the transfer volume between the combustion and expansion cylinder has minimal effect on the brake thermal efficiency.
Recommended Content
Authors
Topic
Citation
Melin, A., Kittelson, D., and Northrop, W., "Parametric 1-D Modeling Study of a 5-Stroke Spark-Ignition Engine Concept for Increasing Engine Thermal Efficiency," SAE Technical Paper 2015-01-1752, 2015, https://doi.org/10.4271/2015-01-1752.Also In
References
- Martins , J. , Uzuneanu , K. , Ribeiro , B. , and Jasasky , O. Thermodynamic Analysis of an Over-Expanded Engine SAE Technical Paper 2004-01-0617 2004 10.4271/2004-01-0617
- Mallikarjuna , J. and Ganesan , V. Theoretical and Experimental Investigations of Extended Expansion Concept for SI Engines SAE Technical Paper 2002-01-1740 2002 10.4271/2002-01-1740
- Mallikarjuna , J. and Ganesan , V. NUMERICAL PREDICTIONS AND EXPERIMENTAL INVESTIGATIONS ON EXTENDED EXPANSION ENGINE PERFORMANCE AND EXHAUST EMISSIONS SAE Technical Paper 2000-01-1415 2000 10.4271/2000-01-1415
- Ferrey , P. , Miehe , Y. , Constensou , C. , and Collee , V. Potential of a Variable Compression Ratio Gasoline SI Engine with Very High Expansion Ratio and Variable Valve Actuation SAE Int. J. Engines 7 1 468 487 2014 10.4271/2014-01-1201
- Wang , C. , Daniel , R. , and Xu , H. Research of the Atkinson Cycle in the Spark Ignition Engine SAE Technical Paper 2012-01-0390 2012 10.4271/2012-01-0390
- Pertl , P. , Trattner , A. , Abis , A. , Schmidt , S. et al. Expansion to Higher Efficiency - Investigations of the Atkinson Cycle in Small Combustion Engines SAE Technical Paper 2012-32-0059 2012 10.4271/2012-32-0059
- KENTFIELD , J. Extended, and Variable, Stroke Reciprocating Internal Combustion Engines SAE Technical Paper 2002-01-1941 2002 10.4271/2002-01-1941
- Boretti , A. and Scalzo , J. Exploring the Advantages of Variable Compression Ratio in Internal Combustion Engines by Using Engine Performance Simulations SAE Technical Paper 2011-01-0364 2011 10.4271/2011-01-0364
- Watanabe , S. , Koga , H. , and Kono , S. Research on Extended Expansion General-Purpose EngineTheoretical Analysis of Multiple Linkage System and Improvement of Thermal Efficiency SAE Technical Paper 2006-32-0101 2006 10.4271/2006-32-0101
- Atkinson , J. Gas engine United States Patent 367496 1887
- SAKATA , Y. , YAMANA , K. , NISHIDA , K. , SHIMIZU , T. et al. A Study on Optimization of an Over-Expansion Cycle Gasoline Engine with Late-Closing of Intake Valves SAE Technical Paper 2007-24-0089 2007 10.4271/2007-24-0089
- Anderson , M. , Assanis , D. , and Filipi , Z. First and Second Law Analyses of a Naturally-Aspirated, Miller Cycle, SI Engine with Late Intake Valve Closure SAE Technical Paper 980889 1998 10.4271/980889
- Miller , R. Supercharged engine United States Patent 2817322 1957
- Ailloud , C. , Delaporte , B. , Schmitz , G. , Keromnes , A. et al. Development and Validation of a Five Stroke Engine SAE Technical Paper 2013-24-0095 2013 10.4271/2013-24-0095
- Schmitz , G. Five-stroke internal combustion engine United States Patent 6553977 2003
- GT-Power User's manual and Tutorial GT-SuiteTM Version 7.4 Gamma Technologies inc. 2013
- Chen , S. and Flynn , P. Development of a Single Cylinder Compression Ignition Research Engine SAE Technical Paper 650733 1965 10.4271/650733