This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Influence of Laminar Burning Velocity on Performance of Gasoline Engines
Technical Paper
2012-01-1742
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
Laminar burning velocity is a fundamental combustion property of any fuel/air mixture. Formulating gasoline fuel blends having faster burning velocities can be an effective strategy for enhancing engine and vehicle performance. Formulation of faster burning fuels by changing the fuel composition has been explored in this work leading to a clear correlation between engine performance and fuel burning velocity. In principle a gasoline vehicle should be calibrated to give optimal ignition timing (also known as MBT - minimum spark advance for best torque) while at the same time avoiding any possible engine knock. However, modern downsized/boosted engines frequently tend to be limited by knock and the spark timing is retarded in respect of the optimum. In such scenarios, faster burning fuels can lead to a more optimum combustion phasing resulting in a more efficient energy transfer and hence a faster acceleration and better performance. Tests carried out using fuel blends with different burn velocity enhancing components on a single cylinder engine with retarded spark timing showed appreciable benefits (e.g. 1.5% performance benefit using a gasoline blend with 20% of a certain aromatic added). The trends observed in the engine were in good agreement with results of laminar burning velocity measurements published in literature.
Recommended Content
Authors
Topic
Citation
Cracknell, R., Prakash, A., and Head, R., "Influence of Laminar Burning Velocity on Performance of Gasoline Engines," SAE Technical Paper 2012-01-1742, 2012, https://doi.org/10.4271/2012-01-1742.Also In
References
- California-Air-Resources-Board Laws and regulations 2011 http://www.arb.ca.gov/html/lawsregs.htm
- Shell Gas-to-liquids 2011 http://www.shell.com/home/content/innovation/meeting_demand/natural_gas/gtl/
- Heywood, J.B. Internal combustion engine fundamentals 2011 Mc Graw Hill
- Turner, D. et al. Combustion performance of bio-ethanol at various blend ratios in a gasoline direct injection engine Fuel
- Bradley, D. Lawes, M. Mansour, M. Measurement of turbulent burning velocities in implosions at high pressures Proceedings of the Combustion Institute 33 1 1269 1275
- Bradley, D. Lawes, M. Mansour, M. Correlation of turbulent burning velocities of ethanol-air, measured in a fan-stirred bomb up to 1.2 MPa Combustion and Flame 158 1 123 138
- Van Lipzig, J. et al. Laminar burning velocities of n-heptane, iso-octane, ethanol and their binary and tertiary mixtures Fuel 2011
- Ananda Srinivasan, C.G.S. Study of Combustion Characteristics of an SI Engine Fuelled with Ethanol and Oxygenated Fuel Additives Journal of sustainable energy and environment 2010 1 85 91
- Ji, C. Wang, S. Effect of hydrogen addition on combustion and emissions performance of a spark ignition gasoline engine at lean conditions International Journal of Hydrogen Energy 2009 34 18 7823 7834
- Shinagawa, T. Okumura, T. Furuno, S. Kim, K. “Effects of Hydrogen Addition to SI Engine on Knock Behavior,” SAE Technical Paper 2004-01-1851 2004 10.4271/2004-01-1851
- Johansson, B. “Influence of the Velocity Near the Spark Plug on Early Flame Development,” SAE Technical Paper 930481 1993 10.4271/930481
- Farrell, J. Johnston, R. Androulakis, I. “Molecular Structure Effects On Laminar Burning Velocities At Elevated Temperature And Pressure,” SAE Technical Paper 2004-01-2936 2004 10.4271/2004-01-2936