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Standard Knock Intensity Revisited: Atypical Burn Rate Characteristics identified in the CFR Octane Rating Engine
Technical Paper
2004-01-1850
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
The paper studied the burn rate of fuels in the CFR engine at standard knock intensity. Burn duration was found to increase with compression ratio, and knocking pressure traces exhibited a distinct change in slope, thought to be the onset of knock. A criterion was developed to identify this knock-point. The knock-point was related to the mass fraction bunt and it was found that the mass fraction burnt at the knock-point decreases as the compression ratio decreases, to as little as 30%. It is proposed that the nature of knock in the CFR engine is unique in that a large fraction of the trapped mass participates in the autoignition. The paper also presented a functional descriptor for the mass fraction burnt and illustrated the suitability thereof through the application in an engine model.
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Citation
Swarts, A., Yates, A., Viljoen, C., and Coetzer, R., "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.Also In
Mixture Preparation, Combustion and Emission Formation Processes in SI Engines, and Diesel Spray and Mixture Formation
Number: SP-1888; Published: 2004-06-08
Number: SP-1888; Published: 2004-06-08
References
- Standard Test Method for Motor Octane Number of a Spark-Ignition Engine Fuel ASTM Designation: D 2700-01a October 2001
- Standard Test Method for Research Octane Number of a Spark-Ignition Engine Fuel ASTM Designation: D 2699-01a October 2001
- Yates, A.B.D. Swarts, A. Viljoen, C.L. “An Investigation of Anomalies Identified Within the ASTM Research and Motor Octane Scales” SAE paper 2003-01-1772 2003
- Swarts, A. Viljoen, C.L. Coetzer, R. “The Analysis of Observed Burn Rates in a Spark-Ignition Engine and the Relation to Fuel Properties” SAE paper 2003-01-3125 2003
- Taylor, C. F. The Internal Combustion Engine In Theory And Practice 1 Second The MIT Press Cambridge 1971
- Ricardo, H. R. Sir “The High-Speed Internal-combustion Engine” Blackie & Son 1953
- Heywood, J.B. “Internal Combustion Engine Fundamentals” McGraw-Hill Book Company New York 1988 0-07-100499-8
- Taylor, C. F. “The Internal Combustion Engine In Theory And Practice Volume 2: Combustion, Fuels, Materials, Design” The MIT Press Cambridge 1985
- Maly, R Ziegler, G “Thermal Combustion Modeling - Theoretical and Experimental Investigation of the Knocking Process” SAE paper 820759 1982
- Broeze, J.J. “Combustion in Piston Engines”
- Haghgooie, M. “Effects of Fuel Octane Number and Inlet Air Temperature on Knock Characteristics of a Single Cylinder Engine” SAE paper 902134 1990
- Kalghatgi, G.T. Snowdon, P MacDonald, C. “Studies of Knock in a Spark-Ignition Engine with “CARS” Temperature Measurements and Using Different Fuels” SAE paper, 950690 1995
- Bradley, D. Kalghatgi, G.T. Golombok, M. “Fuel Blend and Mixture Strength Effects on Autoignition heat Release Rate s and Knock Intensity in S.I. Engines” SAE paper 962105 1996
- Daniels, C.F. Zhu, G.G. Winkelman, J. “Inaudible knock and partial-burn detection using in-cylinder ionization signal” SAE paper 2003-01-3149 2003
- Gabano, J.D. Kageyama, T. Fission, F Leyer, J.C. “Experimental Simulation of Engine Knock by Means of Preheated Static Combustion Chamber” 22nd Symposium (International) on Combustion 1988
- S-PLUS 6 for Windows Guide to Statistics 2 Insightful Corporation Seattle WA
- Leppard, W.R “The Autoignition Chemistries of Primary Reference Fuels, Olefin/Paraffin Binary Mixtures, and Non-Linear Octane Blending” SAE 922325 1992
- Bood, J. Bengtsson, P.E. Mauss, F. Burgdorf, K. Denbratt, I. “Knock in Spark-Ignition Engines: End-gas temperature measurements using Rotational CARS and detailed kinetic calculations of the autoignition process.” SAE paper No. 971669 1997
- Rassweiler, G.M. Withrow, L. “Motion Pictures of Engine Flames Correlated with Pressure Cards” SAE paper 800131 1980
- Bradley, D. Kalghatgi, G.Y. Golombrook, M Yeo, J. “Heat Release Rates Due to Autoignition and their Relationship to Knock Intensity in Spark Ignition Engines” 26th Symposium (International) on Combustion The Combustion Institute 1996
- Elmqvist, C. Lindström, F. Ångström, H. Grandin, B. Kalghatgi, G. “Optimizing engine concepts by using a simple model for knock prediction” SAE paper 2003-01-3128 2003
- Oppenheim, A.K. Kuhl, A.L. “Life of Fuel in Engine Cylinder” SAE paper 980780 1998
- Venables, W.N Ripley, B.D. “Modern Applied Statistics with S-PLUS” Third Springer-Verlag New York, Inc. 1999
- Livengood, J. C. Wu, P. C. “Correlation of Autoignition Phenomena in Internal Combustion Engines and Rapid Compression Machines” 5th Symposium (International) on Combustion Reinhold Publishing Corporation 1955
- Douaud, A. M. Eyzat P. “Four Octane Number Method for Predicting the Anti-Knock Behaviour of Fuels and Engines” SAE paper 780080 1978
- Brussovansky, S. Heywood, J.B. Keck, J.C. “Predicting the Effects of Air and Coolant Temperature, Deposits, Spark Timing and Speed on Knock in Spark Ignition Engines” SAE paper 922324 1992
- Nakano, M. Nakahara, S. Akihama, K Kubo, S. Yamazahi, S. “Predictions of the Knock Onset and the Effects of Heat Release Pattern and Unburned Gas Temperature on Torque at Knock Limit in S.I. Engines” SAE paper 952408 1995
- Cowart, J.S. Keck, J.C. Heywood, J.B. Westbrook, C.K Pitz, W.J. “Engine Knock Prediction Using a Fully-Detailed and a Reduced Chemical Kinetic Mechanism” 23rd Symposium (International) on Combustion The Combustion Institute 1990
- Halstead, M.P. Kirsch, L.J. Quinn, P. “The Autoignition of Hydrocarbon Fuels at High Temperatures and Pressures - Fitting of a Mathematical Model” Combustion and Flame 30 45 60 1977
- Westbrook, C.K. Curran, H.J. Pitz, W.J. Griffiths, J.F. Mohamed, C. Wo, S.K. “The Effects of Pressure, Temperature, and Concentration on the Reactivity of Alkanes: Experiments and Modeling in a Rapid Compression Machine” Twenty-seventh Symposium (Int.) on Combustion The Combustion Institute 371 378 1998
- Stiebels, B. Schreiber, M. Sakak, S. “Development of a New Measurement Technique for the Investigation of End-Gas Autoignition and Engine Knock” SAE paper 960827 1996
- Curran, H.J. Pitz, W.J. Westbrook, C.K. Griffiths, J.F. Mohamed, C. “Kinetic Modeling of Hydrocarbon Autoignition at Low and Intermediate Temperatures in a Rapid Compression Machine” Proceedings of 3 rd Workshop on Modeling of Chemical Reaction Systems University of Heidelberg 1996