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The Impact of Octane Number Boosters on Knock Characteristics in a Cooperative Fuel Research (CFR) Engine
Technical Paper
2022-01-1082
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
In this study, fuel octane number boosters such as toluene, ethanol, methanol, 2-methylfuran (MF), and 2,5-dimethylfuran (DMF) are blended with primary reference fuels (PRFs) in a cooperative fuel research (CFR) engine at research octane number (RON) relevant conditions. In addition to RON determination, engine operation is characterized by measuring (i) cylinder, intake and exhaust pressure, (ii) averaged intake and exhaust temperature, and (iii) air-fuel-ratio. For known fuel blends, the measured RON corresponds well with existing literature. The addition of MF in PRF yields a significant increase in RON and blending octane numbers (indicating booster impact) up to 216. Cylinder pressure fluctuations, the classical definition of knock intensity, are however not consistent, deviating between PRFs and all boosted blends at higher RON values. Moreover, some fuel blends exhibit scarcely any knocking behavior in the test conditions. The differences cannot be explained purely by ignition delay time, whereas blend-specific flame propagation rate may have an impact. Measurements with two opposing pressure sensors indicate that pressure fluctuations are generally stronger at the spark plug vicinity. With the exception of magnitude, knock amplitude spectra are highly similar with different fuels and the two sensors. The results provide insights into the characteristics and limitations of the CFR engine in the context of such modern octane number boosters, while the detailed measurement data provide a valuable reference for simulations.
Authors
Citation
Keskinen, K., Bhattacharya, A., Kaario, O., Blomstedt, O. et al., "The Impact of Octane Number Boosters on Knock Characteristics in a Cooperative Fuel Research (CFR) Engine," SAE Technical Paper 2022-01-1082, 2022, https://doi.org/10.4271/2022-01-1082.Also In
References
- Kalghatgi , G. , Levinsky , H. , and Colket , M. Future Transportation Fuels Progress in Energy and Combustion Science 69 2018 103 105
- Svanberg , M. et al. Renewable Methanol as a Fuel for the Shipping Industry Renewable and Sustainable Energy Reviews 94 2018 1217 1228
- Korberg , A.D. et al. Techno-Economic Assessment of Advanced Fuels and Propulsion Systems in Future Fossil-Free Ships Renewable and Sustainable Energy Reviews 142 2021 110861
- Onorati , A. et al. The Role of Hydrogen for Future Internal Combustion Engines International Journal of Engine Research 23 4 2022 529 540
- Rankovic , N. et al. Understanding Octane Number Evolution for Enabling Alternative Low RON Refinery Streams and Octane Boosters as Transportation Fuels Fuel 150 2015 41 47
- Badia , J. et al. New Octane Booster Molecules for Modern Gasoline Composition Energy & Fuels 35 14 2021 10949 10997
- Mittal , V. and Heywood , J.B. The Shift in Relevance of Fuel RON and MON to Knock Onset in Modern SI Engines Over the Last 70 Years SAE International Journal of Engines 2 2 2010 1 10
- Swarts , A. et al. Standard Knock Intensity Revisited: Atypical Burn Rate Characteristics Identified in the CFR Octane Rating Engine SAE Technical Paper 2004-01-1850 2004 https://doi.org/10.4271/2004-01-1850
- Swarts , A. et al. A Further Study of Inconsistencies between Autoignition and Knock Intensity in the CFR Octane Rating Engine SAE Transactions 114 2005 702 720
- Swarts , A. and Yates , A. Insights into the Role of Autoignition During Octane Rating SAE Technical Paper 2007-01-0008 2007 https://doi.org/10.4271/2007-01-0008
- Rockstroh , T. et al. Insights into Engine Knock SAE International Journal of Fuels and Lubricants 11 4 2018 545 562
- Swarts , A. and Kalaskar , V. Bridging the Knock Severity Gap to CFR Octane Rating Engines SAE International Journal of Advances and Current Practices in Mobility 3 2020-01-2050 2020 240 249
- Foong , T.M. et al. The Effect of Charge Cooling on the RON of Ethanol/Gasoline Blends SAE International Journal of Fuels and Lubricants 6 1 2013 34 43
- Hauber , J. , Huber , K. , and Nell , R. New GKI-Gasoline Knock Index for Rating of Fuel’s Knock Resistance on an Upgraded CFR Test Engine SAE Technical Paper 2018-01-1743 2018 https://doi.org/10.4271/2018-01-1743
- Morganti , K.J. et al. The Autoignition of Liquefied Petroleum Gas (LPG) in Spark-Ignition Engines Proceedings of the Combustion Institute 35 3 2015 2933 2940
- Pal , P. et al. Development of a Virtual CFR Engine Model for Knocking Combustion Analysis SAE International Journal of Engines 11 6 2018 1069 1082
- Choi , S. et al. Development and Validation of a Three Pressure Analysis (TPA) GT-Power Model of the CFR F1/F2 Engine for Estimating Cylinder Conditions SAE Technical Paper 2018-01-0848 2018 https://doi.org/10.4271/2018-01-0848
- Salih , S. and DelVescovo , D. Design and Validation of a GT Power Model of the CFR Engine Towards the Development of a Boosted Octane Number SAE Technical Paper 2018-01-0214 2018 https://doi.org/10.4271/2018-01-0214
- Kalvakala , K. et al. Numerical Analysis of Fuel Effects on Advanced Compression Ignition Using a Cooperative Fuel Research Engine Computational Fluid Dynamics Model Journal of Energy Resources Technology 143 10 2021
- Salih , S. et al. Defining the Boundary Conditions of the CFR Engine under RON Conditions for Knock Prediction and Robust Chemical Mechanism Validation Internal Combustion Engine Division Fall Technical Conference 2018
- Foong , T.M. et al. Modeling End-Gas Autoignition of Ethanol/Gasoline Surrogate Blends in the Cooperative Fuel Research Engine Energy & Fuels 31 3 2017 2378 2389
- Boot , M.D. et al. Impact of Fuel Molecular Structure on Auto-Ignition Behavior-Design Rules for Future High Performance Gasolines Progress in Energy and Combustion Science 60 2017 1 25
- Derfer , J. et al. 1958
- Wang , C. et al. Combustion Characteristics and Emissions of 2-Methylfuran Compared to 2, 5-Dimethylfuran, Gasoline and Ethanol in a DISI Engine Fuel 103 2013 200 211
- Rothamer , D.A. and Jennings , J.H. Study of the Knocking Propensity of 2, 5-Dimethylfuran-Gasoline and Ethanol-Gasoline Blends Fuel 98 2012 203 212
- Waqas , M. et al. Blending Octane Number of Ethanol in HCCI, SI and CI Combustion Modes SAE International Journal of Fuels and Lubricants 9 3 2016 659 682
- Naser , N. , Sarathy , S.M. , and Chung , S.H. Estimating Fuel Octane Numbers from Homogeneous Gas-Phase Ignition Delay Times Combustion and Flame 188 2018 307 323
- Naser , N. et al. Relating the Octane Numbers of Fuels to Ignition Delay Times Measured in an Ignition Quality Tester (IQT) Fuel 187 2017 117 127
- Morgan , N. et al. Mapping Surrogate Gasoline Compositions into RON/MON Space Combustion and Flame 157 6 2010 1122 1131
- Knop , V. et al. A Linear-By-Mole Blending Rule for Octane Numbers of N-Heptane/Iso-Octane/Toluene Mixtures Fuel 115 2014 666 673
- Shahlari , A.J. and Ghandhi , J. Pressure-Based Knock Measurement Issues SAE Technical Paper 2017-01-0668 2017 https://doi.org/10.4271/2017-01-0668
- Hoth , A. and Kolodziej , C.P. Effects of Knock Intensity Measurement Technique and Fuel Chemical Composition on the Research Octane Number (RON) of FACE Gasolines: Part 1-Lambda and Knock Characterization Fuel 304 2021 120722
- Arias , D.A. and Shedd , T.A. CFD Analysis of Flow Field and Pressure Losses in Carburetor Venturi SAE Technical Paper 2006-32-0113 2006 https://doi.org/10.4271/2006-32-0113
- Roy , B. et al. Effect of Modified Shrouded Intake Valve on Performance and Emissions of Spark Ignition Engine Clean Technologies and Environmental Policy 21 3 2019 547 563
- Larsson , T. , Stenlaas , O. , and Erlandsson , A. Future Fuels for DISI Engines: A Review on Oxygenated, Liquid Biofuels SAE Technical Paper 2019-01-0036 2019 https://doi.org/10.4271/2019-01-0036
- Stein , R.A. et al. Effect of Heat of Vaporization, Chemical Octane, and Sensitivity on Knock Limit for Ethanol-Gasoline Blends SAE International Journal of Fuels and Lubricants 5 2 2012 823 843
- Thewes , M. et al. Analysis of the Impact of 2-Methylfuran on Mixture Formation and Combustion in a Direct-Injection Spark-Ignition Engine Energy & Fuels 25 12 2011 5549 5561
- Singh , E. et al. 2-Methylfuran: A Bio-Derived Octane Booster for Spark-Ignition Engines Fuel 225 2018 349 357
- Tiunov , I. et al. Antiknock Properties of Blends of 2-Methylfuran and 2, 5-Dimethylfuran with Reference Fuel Chemistry and Technology of Fuels and Oils 53 2 2017 147 153
- Shankar , V.S.B. et al. Understanding the Synergistic Blending Octane Behavior of 2-Methylfuran Proceedings of the Combustion Institute 38 4 2021 5625 5633
- Foong , T.M. et al. The Octane Numbers of Ethanol Blended with Gasoline and its Surrogates Fuel 115 2014 727 739
- Kalghatgi , G. Knock Onset, Knock Intensity, Superknock and Preignition in Spark Ignition Engines International Journal of Engine Research 19 1 2018 7 20
- Kalghatgi , G. , Algunaibet , I. , and Morganti , K. On Knock Intensity and Superknock in SI Engines SAE International Journal of Engines 10 3 2017 1051 1063
- Arrigoni , V. and Cornetti , G. High Speed Knock in SI Engines SAE Technical Paper 741056 1974 https://doi.org/10.4271/741056
- Hoth , A. et al. Combustion Characteristics of PRF and TSF Ethanol Blends with RON 98 in an Instrumented CFR Engine SAE Technical Paper 2018-01-1672 2018 https://doi.org/10.4271/2018-01-1672
- Kolodziej , C.P. and Wallner , T. Combustion Characteristics of Various Fuels During Research Octane Number Testing on an Instrumented CFR F1/F2 Engine Combustion Engines 171 4 2017
- Goodwin , D.G. , Moffat , H.K. , and Speth , R.L. 2009 124
- Bhattacharya , A. et al. Analysis of Gasoline Surrogate Combustion Chemistry with a Skeletal Mechanism SAE Technical Paper 2020-01-2004 2020 https://doi.org/10.4271/2020-01-2004
- Bhattacharya , A. et al. Effects of Blending 2, 5-Dimethylfuran and Dimethyl Ether to Toluene Primary Reference Fuels: A Chemical Kinetic Study Fuel 304 2021 121401
- Westbrook , C. et al. Detailed Chemical Kinetic Reaction Mechanisms for Primary Reference Fuels for Diesel Cetane Number and Spark-Ignition Octane Number Proceedings of the Combustion Institute 33 1 2011 185 192
- Yates , A. , Bell , A. , and Swarts , A. Insights Relating to the Autoignition Characteristics of Alcohol Fuels Fuel 89 1 2010 83 93
- Heywood , J.B. Internal Combustion Engine Fundamentals McGraw-Hill Education 2018
- Broustail , G. et al. Experimental Determination of Laminar Burning Velocity for Butanol and Ethanol Iso-Octane Blends Fuel 90 1 2011 1 6
- Huang , Y. , Sung , C. , and Eng , J. Laminar Flame Speeds of Primary Reference Fuels and Reformer Gas Mixtures Combustion and Flame 139 3 2004 239 251
- Liao , Y.-H. and Roberts , W.L. Laminar Flame Speeds of Gasoline Surrogates Measured with the Flat Flame Method Energy & Fuels 30 2 2016 1317 1324
- Liiva , P. et al. Use of Multiple Pressure Transducers to Find In-Cylinder Knock Location SAE Technical Paper 922368 1992 https://doi.org/10.4271/922368
- Shi , H. et al. Multiple Spark Plugs Coupled with Pressure Sensors: A New Approach for Knock Mechanism Study on SI Engines Energy 227 2021 120382
- Corrigan , D.J. , Breda , S. , and Fontanesi , S. A Simple CFD Model for Knocking Cylinder Pressure Data Interpretation: Part 1 SAE Technical Paper 2021-24-0051 2021 https://doi.org/10.4271/2021-24-0051