This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Impact of Fuel Octane Rating and Aromatic Content on Stochastic Pre-Ignition
Technical Paper
2016-01-0721
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
The effects of aromatic content and octane rating of gasoline fuels on stochastic pre-ignition (SPI) behaviors were investigated at typical operating conditions using a modern 2.0 L turbocharged engine. In-cylinder pressure time history measurements made during a speed-load test sequence designed to stimulate SPI were used to determine both the frequency of SPI occurrence and the in-cylinder peak pressure during such events. Six fuels were tested with varying levels of aromatic content (15 - 35% by vol.) and two octane rating levels (∼88 & 94 anti-knock index). The engine was operated using a production-intent calibration with equivalence ratio near one. Pressure and temperature in the intake manifold were held constant near two bar and 35°C respectively. Significant SPI activity was observed, with abnormal event frequencies up to ∼1 SPI event per 1,000 engine cycles and in-cylinder peak pressures up to ∼200 bar. Aromatic content correlated directly with frequency of SPI occurrence and had minimal effect on in-cylinder peak pressures; whereas, octane rating correlated inversely with in-cylinder peak pressures during SPI and had minimal effect on frequency. Analysis revealed that for the higher octane fuels only deflagration was evident and for the lower octane fuels deflagration transitioned to a violent auto-ignition of the unburned charge. The strong effect of aromatic content and the discovery of a minimum concentration below which no SPI was observed under the operating conditions evaluated suggests that the chemical and/or physical pathways of this fuel component were critical to SPI behavior at these conditions.
Recommended Content
Authors
Citation
Mansfield, A., Chapman, E., and Briscoe, K., "Impact of Fuel Octane Rating and Aromatic Content on Stochastic Pre-Ignition," SAE Technical Paper 2016-01-0721, 2016, https://doi.org/10.4271/2016-01-0721.Also In
References
- Haenel , P. , Seyfried , P. , Kleeberg , H. , and Tomazic , D. Systematic Approach to Analyze and Characterize Preignition Events in Turbocharged Direct-injected Gasoline Engines SAE Technical Paper 2011-01-0343 2011 10.4271/2011-01-0343
- Sturgis , B. Abnormal Combustion Problems in Gasoline Engines SAE Technical Paper 610401 1961 10.4271/610401
- Pless , L. Surface Ignition and Rumble in Engines: A Literature Review SAE Technical Paper 650391 1965 10.4271/650391
- Amann , M. , Mehta , D. , and Alger , T. Engine Operating Condition and Gasoline Fuel Composition Effects on Low-Speed Pre-Ignition in High-Performance Spark Ignited Gasoline Engines SAE Int. J. Engines 4 1 274 285 2011 10.4271/2011-01-0342
- Wang , Z. , Qi , Y. , Liu , H. , Long , Y. et al. Experimental Study on Pre-Ignition and Super-Knock in Gasoline Engine Combustion with Carbon Particle at Elevated Temperatures and Pressures SAE Technical Paper 2015-01-0752 2015 10.4271/2015-01-0752
- Chapman , E. , Davis , R. , Studzinski , W. , and Geng , P. Fuel Octane and Volatility Effects on the Stochastic Pre-Ignition Behavior of a 2.0L Gasoline Turbocharged DI Engine SAE Int. J. Fuels Lubr. 7 2 379 389 2014 10.4271/2014-01-1226
- Dahnz , C. , Han , K. , Spicher , U. , Magar , M. et al. Investigations on Pre-Ignition in Highly Supercharged SI Engines SAE Int. J. Engines 3 1 214 224 2010 10.4271/2010-01-0355
- Sasaki , N. and Nakata , K. Effect of Fuel Components on Engine Abnormal Combustion SAE Tech. Pap. 2012-01-1276 2012 10.4271/2012-01-1276
- Zahdeh , A. , Rothenberger , P. , Nguyen , W. , Anbarasu , M. et al. Fundamental Approach to Investigate Pre-Ignition in Boosted SI Engines SAE Int. J. Engines 4 1 246 273 2011 10.4271/2011-01-0340
- Zaccardi , J. , Duval , L. , and Pagot , A. Development of Specific Tools for Analysis and Quantification of Preignition in a Boosted SI Engine SAE Int. J. Engines 2 1 1587 1600 2009 10.4271/2009-01-1795
- Wang , Z. , Liu , H. , Song , T. , Qi , Y. , He , X. , Shuai , S. , and Wang , J. Relationship between super-knock and preignition Int. J. Engine Res. 16 2 166 180 2015 10.1177/1468087414530388
- Peters , N. , Kerschgens , B. , and Paczko , G. Super-Knock Prediction Using a Refined Theory of Turbulence SAE Int. J. Engines 6 2 953 967 2013 10.4271/2013-01-1109
- Wang , Z. , Liu , H. , Song , T. , Xu , Y. et al. Investigation on Pre-ignition and Super-Knock in Highly Boosted Gasoline Direct Injection Engines SAE Technical Paper 2014-01-1212 2014 10.4271/2014-01-1212
- Perry , R. , Gerard , P. , and Heath , D. The Influence of Gasoline Composition on Abnormal Combustion in Spark Ignition Engines SAE Technical Paper 610145 1961 10.4271/610145
- Okada , Y. , Miyashita , S. , Izumi , Y. , and Hayakawa , Y. Study of Low-Speed Pre-Ignition in Boosted Spark Ignition Engine SAE Int. J. Engines 7 2 584 594 2014 10.4271/2014-01-1218
- Salooja , K.C. Studies of combustion processes leading to ignition in hydrocarbons Combust. Flame 4 October 117 136 1960 10.1016/S0010-2180(60)80016-8