This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Diesel Fumigation Partial Premixing for Reducing Ignition Delay and Amplitude of Pressure Fluctuations
Annotation ability available
Sector:
Language:
English
Abstract
The results of an experimental study in a DI Diesel engine are presented which shows that partial premixing, using direct diesel fumigation of the inlet air, achieved a reduction in the ignition delay, the magnitude of high frequency rapid pressure fluctuations, the maximum rate of pressure rise and the amplitude of the rate of the high frequency pressure oscillations. Two methods of diesel fumigation were investigated. The difference between these two methods was the degree of premixing of diesel fuel with the inlet air. The first technique used a fine (5 micron) diesel spray onto a glow plug and the second technique used prevaporised diesel. A Perkins 4-236 engine was run both with and without fumigation at two different steady state speeds roughly covering both city and highway running conditions. The maximum fumigation rate used was 22% and this caused an increase in the peak rate of pressure rise prior to the end of the ignition delay (peak compression rate) by 90% with a reduction in the amplitude of the high frequency pressure oscillations by 90%. a reduction in the of maximum rate of change of pressure due to main fuel combustion by 90%, in increase in the rate of pressure rise at the end of the ignition delay by 130% and a reduction in the ignition delay by 50%. It was also shown that the magnitude of the pressure rise and maximum rate of pressure rise were strongly dependent upon the amount of liquid fuel injected directly into the engine cylinder, as expected for normal diesel diffusion controlled combustion.
Recommended Content
Authors
Topic
Citation
Zaidi, K., Andrews, G., and Greenhough, J., "Diesel Fumigation Partial Premixing for Reducing Ignition Delay and Amplitude of Pressure Fluctuations," SAE Technical Paper 980535, 1998, https://doi.org/10.4271/980535.Also In
References
- Suzuki H. Koike N. Ishii H. Odaka M. Exhaust Purification of Diesel Engines by Homogeneous Charge with Compression Ignition Part 1: Experimental Investigation of Combustion and Exhaust Emission Behaviour Under Pre-Mixed Homogeneous Charge Compression Ignition Method SAE paper 970313
- Suzuki H. Koike N. Ishii H. Odaka M. Exhaust Purification of Diesel Engines by Homogeneous Charge with Compression Ignition Part 2: Analysis of Combustion Phenomena and NOx Formation by Numerical Simulation with Experiment SAE paper 970315
- Arcoumanis C. Internal Combustion Engines Academic Press 1988
- Heywood J. B. Internal Combustion Engine Fundamentals McGraw Hill Book Company 1988
- Lyn W. T. An Experimental Investigation into the Effect of Fuel Addition to Intake Air on the Performance of a Compression-Ignition Engine Institution of Mechanical Engineers London 1964
- Karim G. A. The Dual Fuel Engine Automotive Engine Alternatives Evans R. L. Plenum Press
- Osscs, M. Andrews, G.E. Greenhough, J.H. Diesel Fumigation Partial Premixing for Reduced Particulate Soot Fraction Emissions SAE Paper 980532 1998
- Alperstein, M. Swim, W.B. Schweitzer, P.H. Fumigation kills diesel smoke and improves performance SAE 66 1958
- Kwon, S. Arai, M. Hiroyasu, H. Effect of fumigated fuel on the ignition and initial combustion stages in a DI diesel engine SAE Paper 891880 SAE Trans. 98 1989