This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Mechanism Analysis on the Effect of Fuel Properties on Knocking Performance at Boosted Conditions
Technical Paper
2019-01-0035
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
In recent years, boosted and downsized engines have gained much attention as a promising technology to improve fuel economy; however, knocking is a common issue of such engines that requires attention.
To understand the knocking phenomenon under downsized and boosted engine conditions deeply, fuels with different Research Octane Number (RON) and Motor Octane Number (MON) were prepared, and the knocking performances of these fuels were evaluated using a single cylinder engine, operated under a variety of conditions.
Experimental results showed that the knocking performance at boosted conditions depend on both RON and MON. While higher RON showed better anti-knocking performance, lower MON showed better anti-knocking performance. Furthermore, the tendency for a reduced MON to be beneficial became stronger at lower engine speeds and higher boost pressures, in agreement with previously published modelling work.
A new method of interpreting octane appetite is presented which relates the gradient of contour lines of MB50 in RON/MON space to K value.
The results can be further interpreted by understanding the relative contribution of low temperature oxidation (LTO) pathways under the prevailing temperature/pressure conditions in the engine.
Recommended Content
Authors
Citation
Kassai, M., Aksu, C., Shiraishi, T., Cracknell, R. et al., "Mechanism Analysis on the Effect of Fuel Properties on Knocking Performance at Boosted Conditions," SAE Technical Paper 2019-01-0035, 2019, https://doi.org/10.4271/2019-01-0035.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 | ||
| Unnamed Dataset 3 | ||
| Unnamed Dataset 4 | ||
| Unnamed Dataset 5 | ||
| Unnamed Dataset 6 |
Also In
References
- Hirai , T. Strategic Future Powertrain Vision for Tomorrow 39th Vienna Motor Symposium 2017
- Nakajima , Y. , Nagai , T. , Iijima , T. , Yokoyama , J. et al. Analysis of Combustion Patterns Effective in Improving Anti-Knock Performance of a Spark-Ignition Engine JSAE Rev. 13 9 17 1984
- Nakagawa , Y. , Takagi , Y. , Itoh , T. , and Iijima , T. Laser Shadowgraphic Analysis of Knocking in S.I. Engine SAE Technical Paper 845001 1984 10.4271/845001
- Spicher , U. and Kollmeier , H. Detection of Flame Propagation during Knocking Combustion by Optical Fiber Diagnostics SAE Technical Paper 861532 1986 10.4271/861532
- Curran , H.J. , Gaffuri , P. , Pitz , W.J. , and Westbrook , C.K. A Comprehensive Modeling Study of ISO-Octane Oxidation Combustion and Flame 129 253 280 2002
- Noda , T. , Hasegawa , K. , Kubo , M. , and Itoh , T. Development of Transient Knock Prediction Technique by Using a Zero-Dimensional Knocking Simulation with Chemical Kinetics SAE Technical Paper 2004-01-0618 2004 10.4271/2004-01-0618
- Leppard , W. The Chemical Origin of Fuel Octane Sensitivity SAE Technical Paper 902137 1990 10.4271/902137
- Kalghatgi , G. Fuel Anti-Knock Quality - Part I. Engine Studies SAE Technical Paper 2001-01-3584 2001 10.4271/2001-01-3584
- Kalghatgi , G. Fuel Anti-Knock Quality-Part II. Vehicle Studies - How Relevant Is Motor Octane Number (MON) in Modern Engines? SAE Technical Paper 2001-01-3585 2001 10.4271/2001-01-3585
- Mittal , V. and Heywood , J. The Relevance of Fuel RON and MON to Knock Onset in Modern SI Engines SAE Technical Paper 2008-01-2414 2008 10.4271/2008-01-2414
- Prakash , A. , Wang , C. , Janssen , A. , Aradi , A. et al. Impact of Fuel Sensitivity (RON-MON) on Engine Efficiency SAE Int. J. Fuels Lubr. 10 1 115 125 2017
- Davies , T. , Cracknell , R. , Head , B. , Hobbs , K. et al. A New Method to Simulate the Octane Appetite of any Spark Ignition Engine SAE Technical Paper 2011-01-1873 2011 10.4271/2011-01-1873
- Remmert , S. , Campbell , S. , Cracknell , R. , Schuetze , A. et al. Octane Appetite: The Relevance of a Lower Limit to the MON Specification in a Downsized, Highly Boosted DISI Engine SAE Int. J. Fuels Lubr. 7 3 743 755 2014
- Somers , K.P. , Cracknell , R.F. , and Curran , H.J. A Chemical Kinetic Interpretation of the Octane Appetite of Modern Gasoline Engines Proceedings of the Combustion Institute 2018 10.1016/j.proci.2018.05.123
- Cracknell , R.F. , Prakash , A. , Somers , K.P. , and Wang , C. Impact of Detailed Fuel Chemistry on Knocking Behaviour in Engines Günther , M. and Sens , M. Knocking in Gasoline Engines. Proceedings of the 5 th International Conference on Knocking in Gasoline, Engines Springer Berlin, Germany 2017 10.1007/978-3-319-69760-4_14
- Kalghatgi , G. Auto-Ignition Quality of Practical Fuels and Implications for Fuel Requirements of Future SI and HCCI Engines SAE Technical Paper 2005-01-0239 2005 10.4271/2005-01-0239
- Zhou , Z. , Yang , Y. , Brear , M. , Lacey , J. et al. A Comparison of Four Methods for Determining the Octane Index and K on a Modern Engine with Upstream, Port or Direct Injection SAE Technical Paper 2017-01-0666 2017 10.4271/2017-01-0666
- Orlebar , C. , Joedicke , A. , and Studzinski , W. The Effects of Octane, Sensitivity and K on the Performance and Fuel Economy of a Direct Injection Spark Ignition Vehicle SAE Technical Paper 2014-01-1216 2014 10.4271/2014-01-1216
- Cracknell , R. , Prakash , A. , and Head , R. Influence of Laminar Burning Velocity on Performance of Gasoline Engines SAE Technical Paper 2012-01-1742 2012 10.4271/2012-01-1742
- Fandakov , A. , Grill , M. , Bargende , M. , and Kulzer , A. Two-Stage Ignition Occurrence in the End Gas and Modeling Its Influence on Engine Knock SAE Int. J. Engines 10 4 2017 10.4271/2017-24-0001