This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Cycle-To-Cycle Variation with Low Ignition Quality Fuels in a CFR Diesel Engine
Annotation ability available
Sector:
Language:
English
Abstract
Cycle-to-cycle cylinder pressure variation has been observed in a CFR prechamber diesel engine when low ignition quality (low cetane number) fuels are burned. A statistical analysis of this phenomenon for various fuels and blends with cetane numbers as low as zero has been made. Operating conditions used were those specified by the ASTM Cetane Method for rating diesel fuels, in which the inlet air temperature is 150°F. Additional analysis was made at increased inlet air temperatures of 250°F and 350°F.
The cycle-to-cycle variation has been characterized by the variation in the ignition (or pressure rise) delay time. It has been found to increase sharply as fuel cetane number is decreased below 20. The variation in dynamic injection timing was also measured and correlated with that for ignition delay. It has been concluded that the observed injection timing irregularities have no significant effect on ignition delay time, and that the autoignition process becomes unstable due to other factors when fuels of low ignition quality are burned.
Recommended Content
Authors
Topic
Citation
Sczomak, D. and Henein, N., "Cycle-To-Cycle Variation with Low Ignition Quality Fuels in a CFR Diesel Engine," SAE Technical Paper 790924, 1979, https://doi.org/10.4271/790924.Also In
References
- Henein Naeim A. Elias Nabil Y. “A Modified Cetane Scale for Low Ignition Quality Fuels.” Paper 780640 SAE Passenger Car Meeting Troy, Michigan June 1978
- Elias Nabil Y. “An Experimental Study Supported by a Computer Simulation in a Prechamber CFR Diesel Engine Leading to a Modified Cetane Scale for Rating Low Ignition Quality Fuels.” Mechanical Engineering Dept., Wayne State University 1976
- Vichnievsky R. “Combustion in Petrol Engines.” Proceedings from the Joint Conference on Combustion 1955 288
- Andon Jerar Marks Craig “Engine Roughness--The Key to Lower Octane Requirement.” SAE Transactions 1964 72 636
- Patterson Donald J. “Cylinder Pressure Variations, A Fundamental Combustion Problem.” Paper 660129 SAE Automotive Engineering Congress Detroit January 1966
- Darim G. A. “An Examination of the Nature of Random Cyclic Pressure Variation in a Spark Ignition Engine.” Journal of the Institute of Petroleum 53 519 March 1967
- Bolt Jay A. Harrington David L. “The Effects of Mixture Motion Upon the Lean Limit and Combustion of Spark Ignited Mixtures.” SAE Paper 670467 1967
- Cole David E. Mirsky William “Mixture Motion--Its Effect on Pressure Rise in a Combustion Bomb: A New Look at Cyclic Variation.” SAE Paper 680766 1968
- Peters Bruce D. Borman Gary L. “Cyclic Variation and Average Burning Rates in a Spark Ignition Engine.” SAE Paper 700064 1970
- Barton R. K. Kenemuth D. K. Lestz S. S. Meyer W. E. “Cycle-by-Cycle Variations of a Spark Ignition Engine--A Statistical Analysis.” Paper 700488 SAE Mid-Year Meeting Detroit May 1970
- Annand W. J. D. Summers I. G. S. “Observations on the Variability of Spark-Ignition Combustion Using a Single-Cycle Simulator.” SAE Paper 700487 1970
- Matsuoka Shin Yamaguchi Takehisa Umemura Yukio “Factors Influencing the Cyclic Variation of Combustion of Spark Ignition Engine.” SAE Paper 710586 1971
- Barton R. K. Lestz S. S. Meyer W. E. “An Empirical Model for Correlating Cycle-by-Cycle Cylinder Gas Motion and Combustion Variations of a Spark Ignition Engine.” SAE Paper 710163 SAE Automotive Engineering Congress Detroit January 1971
- Winsor Richard E. Patterson Donald J. “Mixture Turbulence--A Key to Cyclic Combustion Variation.” SAE Paper 730086 SAE International Automotive Engineering Congress Detroit January 1973
- Koizumi Iwao Gyakushi Bovuhiko Takamoto Yoshihisa “Study on the Cycle-by-Cycle Variation in Diesel Engines.” Bulletin of the JSME 20 145 July 1977
- Wing R. D. “The Rotary Fuel Injection Pump as a Source of Cyclic Variation in Diesel Engines, and its Effect on Nitric Oxide Emissions.” Proc. Instn. Mech. Engrs. 189 50 497 505 1975 D75 D77
- 1978 Annual Book of ASTM Standards, Part 47 Test Methods for Rating Motor, Diesel, and Aviation Fuels 233 317
- Sczomak David P. “A Study of the Combustion Characteristics of Low Ignition Quality Fuels in a CFR Diesel Engine.” Mechanical Engineering Dept., Wayne State University August 1978
- Khan I. M. XIX 2 1964