This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
An Examination of Cyclic Variations in a Dual Fuel Engine
Annotation ability available
Sector:
Language:
English
Abstract
The paper considers the cyclic variations in performance parameters of a dual fuel engine fuelled with methane. It is shown that such an engine does display cyclic variations that are greater than the corresponding diesel operation, yet smaller than comparable spark ignition operation. The extent of cyclic variation in peak cylinder pressure and ignition delay increases, for any power output, as the pilot diesel quantity is reduced and the extent of gas substitution is increased. The use of extremely small pilots in the unmodified engine can lead to erratic engine performance. Greater cyclic variations are associated with low load rather than high load operation. Furthermore, with an injection system which is well matched to the engine, there is only little cyclic variation associated solely with the pilot, even when its quantity is small. However, the intensity of the variations can increase significantly if any alternative fuel injection system is employed that may not have been thoroughly matched with the engine over the whole load and speed ranges.
Recommended Content
Technical Paper | Effect of Pilot Fuel Quantity on the Performance of a Dual Fuel Engine |
Authors
Citation
Karim, G., Raine, R., and Jones, W., "An Examination of Cyclic Variations in a Dual Fuel Engine," SAE Technical Paper 881661, 1988, https://doi.org/10.4271/881661.Also In
References
- Young, M.B. “Cyclic Dispersion in the Homogeneous Charge Spark Ignition Engine - A Literature Survey” S.A.E. Transactions 90 1981
- Karim, G.A. “An Examination of the Nature of the Random Cyclic Pressure Variations in a Spark-Ignition Engine” Journal of the Institute of Petroleum March 1967 53 112 120
- Karim, G.A. Al-Alousi, Y. Anson, W. “Consideration of Ignition Lag and Combustion Time in a Spark Ignition Engine Using a Data Acquisition System” Proc. of SAE Passenger Car Meeting Troy, Michigan SAE Paper No. 820758 June 1982
- Karim, G.A. Ali, A.I. “Combustion, Knock and Emission Characteristics of a Natural Gas Fuelled Spark Ignition Engine with Particular Reference to Low Intake Temperature Conditions” Proc. of the Institute of Mechanical Engineers London, England 189 139 147 1975
- Al-Alousi, Y. Karim, G.A. “Some Considerations of Cyclic Variations in Spark Ignition Engines Fuelled with Gaseous Fuels” Proc. of SAE International Congress & Exposition Detroit, MI SAE Paper No. 840232 February 1984
- Lyn, W.T. Voldmanis, E. “The Effects of Physical Factors on Ignition Delay” Proc. of the Institute of Mechanical Engineers 181 1 1966/67
- Karim, G.A. Khanna, S. “The Effect of Very Low Air Intake Temperature on the Performance and Exhaust Emission Characteristics of a Diesel Engine” Proc. of SAE National Powerplant and FCIM Meeting Milwaukee September 1974
- Henien, N.A. Lee Chiu-Shan “Autoignition and Combustion of Fuels in Diesel Engines Under Low Ambient Temperatures” SAE Paper No. 861230 1986
- Karim, G.A. “The Dual Fuel Engine” Automotive Engine Alternatives Evans Robert L. Plenum Press New York and London 83 104 1987
- Karim, G.A. Wierzba, I. “Comparative Studies of Methane and Propane as Fuels for Spark Ignition and Compression Ignition Engines” Transactions of the SAE 92 3.676 3.688 1984
- Karim, G.A. Klat, S.R. moore, N.P.W. “Knock in Dual-Fuel Engines” Proc. of the Institute of Mechanical Engineers March 1967 181 453 466
- Raine, R.R. Elder, S.T. Stephenson, J. “Efficiency, Emissions and Combustion Characteristics of Automotive Diesel Engines in Dual Fuel Operation” SAE-Australasia International Conference Proceedings Auckland, N.Z. 1986
- Karim, G.A. Burn, K.S. “The Combustion of Gaseous Fuels in a Dual Fuel Engine of the Compression Ignition Type with Particular Reference to Cold Intake Temperature Conditions” Proc. of SAE International Congress Detroit SAE Paper No. 800263 February 1980
- Lilly, L.R. Diesel Engine Reference Book Butterworth 1985
- Karim, G.A. Uierzba, I. Soriano, B. “The Limits of Flame Propagation Within Homogeneous Streams of Fuel and Air” Transactions of the ASME , Journal of Energ y Resources Technology 108 2 183 187 June 1986
- Karim, G.A. Boon, S. Wierzba, I. “The Lean Flammability Limit of Some Gaseous Mixtures Involving Methane” Proc. of the International Gas Research Conference London (U.K.) 980 990 Government Institutes Inc. Rockville, MD, U.S.A. June 1983