Fuel and Combustion

Fuel and Combustion

Development of an Autoignition Submodel for Knock Prediction in Turbocharged SI Engine

Authors
Amir Hasan Kakaee
Masoud Nasrabadi
School of Automotive Engineering, Iran University of Science and Technology, Tehran, Iran
Abstract
The objective of this paper is to present a simulation model for controlling combustion phasing in order to avoid knock in turbocharged SI engines. An empirically based knock integral model was integrated in a quasi -dimensional simulation tool. The empirical knock model was optimized and validated against engine tests. This model can be used to optimize control strategy of combustion initiation in SI engine to reach the maximum berak turque. The model is able to predict knock onset with an accuracy of 2 crank angle degrees. With the established knock model, it is possible not only to investigate whether knock is observed by changing operating and design parameters, but also to evaluate their effects on knock intensity.
Keywords
Autoignition
Knock integral model
Quasi-dimensional model
Optimization
End gas
1.     By, A., Kempinski, B., and Rife, J. M., “Knock in Spark Ignition Engines,” SAE 810147, 1981.
2.     Douaud, A. M., and Eyzat, P., “Four-Octane-Number Method for Predicting the Anti-Knock Behavior of Fuels and Engines,” SAE 780080, 1978.
3.     Livengood, J. C., and Wu, P. C., “Correlation of Auto Ignition Phenomena in Internal Combustion Engines and Rapid Compression Machines,” Fifth Symposium on Combustion, pp. 347-356, 1955.
4.     Soylu, S., and Van Gerpen, J., “Development of an Autoignition Submodel for Natural Gas Engines,” Fuel, 82, pp. 1699-1707, 2003.
5.     Russ, S., “A Review of the Effect of Engine Operating Conditions on Borderline Knock,” SAE Paper 960497, 1996.
6.     Gerty, M. D., and Heywood, J. B., “An Investigation of Gasoline Engine Knock Limited Performance and the Effects of Hydrogen Enhancement,” SAE paper 2006-0228, 2006.
7.     مؤمنی موحد، م؛ "ارائه راهکار تجربی بهینه برای تشخیص کوبش در یک موتور احتراق داخلی،" پایان­نامه کارشناسی ارشد، دانشکده مهندسی خودرو، دانشگاه علم و صنعت، تهران، ایران، 1388.
8.     Draper, C. S., “Pressure Waves Accompanying Detonation in the Internal Combustion Engine,” J. Aeronautical Sciences, 5, No. 6, 1938.
9.     Towers, J. M., and Hoekstra, R. L., “Engine Knock, a Renewed Concern in Motorsports -A Literature Review,” SAE Paper 983026, 1998.
10.  Pan, J., and Sheppard, C. G. W., “A Theoretical and Experimental Study of the Modes of End Gas Autoignition Leading to Knock in S.I. Engines,” SAE 942060, 1994.
11.   Annand W. J. D., “Geometry of Spherical Flame Propagation in a Disc-Shaped Combustion Chamber,” Journal of Mechanical Engineering Science, 47, pp.146-149, 1970.
12.   Woschni, G., “A Universally Applicable Equation for the Instantaneous Heat Transfer Coefficient in the Internal Combustion Engine,” SAE Paper 670931, 1967.
13.   Verhelst, S., and Sheppard, C. G. W., “Multi-Zone Thermodynamic Modeling of Spark-Ignition Engine Combustion- An Overview,” Energy Conversion and Management, 50, pp. 1326-1335, 2009.
14.   Benson, R. S., Annand, W .J. D., and Baruah, P. C., “A Simulation Model Including Intake and Exhaust Systems for a Single Cylinder Four-Stroke Cycle Spark Ignition Engine,” Int. J. Mech. Sci., 17, pp. 97- 124, 1975.
15.  Heywood, J. B., Internal Combustion Engine Fundamentals, McGraw- Hill, 1988.
16.   Elmqvist, C., and Kalghatgi, G., “Optimizing Engine Concepts by Using a Simple Model for Knock Prediction,” SAE paper 2003-01-3123, 2003.
17.  ابراهیمی، ر؛ "پیش­بینی تأخیر خود­ اشتعالی در موتور اشتعال تراکمی مخلوط همگن"، نشریه علمی- پژوهشی سوخت و احتراق، سال اول، شماره اول، ص29-40، شهریور 1378.
18.  Chun, M., and Heywood, J. B., “Characterization of Knock in a Spark Ignition Engine”, SAE Paper 890156, 1989.
19.   Cowart, J. S., Haghgooie, M., Newman, C. E., and Davis, G. C., “The Intensity of Knock in an Internal Combustion Engine: an Experimental and Modeling Study,” SAE Paper 922327, 1992.