This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Effects of Auxiliary Injection on Diesel Engine Combustion
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1990 by SAE International in United States
Annotation ability available
Pilot injection and two other forms of auxiliary fuel introduction have been studied for their effects on diesel engine combustion and emissions. A two-stroke diesel has been equipped with an electronic solenoid-controlled unit injector such that the injector can operate with pilot injection. In addition, the engine has been fitted with experimental air-blast atomizing injectors in the inlet port and intake manifold. In-cylinder pressure, Bosch smoke, exhaust hydrocarbons, NO and NOx emissions measurements have been made for a range of engine conditions. In addition, two fuels have been tested to observe the effects of fuel blend on the auxiliary fuel behavior.
In general, the effect of auxiliary fuel introduction is to reduce ignition delay and rate-of-pressure rise. This tends to result in a decrease in NO emissions. Unburned hydrocarbons and smoke tend to increase, although not in every case. With 20 cetane, Army Type 1 Referee fuel, extreme rates of pressure rise limit the load at which the engine can be operated with normal injection. With pilot it is possible to operate at high loads.
Heat-release analysis shows that the pilot or preliminary fuel introduction can influence the main combustion event in a variety of ways. In some cases, there is evidence of heat release from the pilot. In other cases, the pilot seems to reduce the overall temperature in the chamber before the main injection event, due to evaporation of the spray, while still reducing the ignition delay of the main charge.
CitationShakal, J. and Martin, J., "Effects of Auxiliary Injection on Diesel Engine Combustion," SAE Technical Paper 900398, 1990, https://doi.org/10.4271/900398.
- McLaughlin E.J. Pinotti P.L. Sigworth H.W. “Power Booster Fuels for Diesel Engines,” SAE Journal 60 42 1952
- Derry L.D. Dodds E.M. Evans E.B. Royle D. “Effect of Auxiliary Fuels on Smoke Limited Power Output of Diesel Engines,” Proc.IMechE 168 9 280 1954
- Arnold W.C. Beadle R. H. Logelin R.L. Young H.D. “Bi-fuel Approach to Burning Residual Fuels in Diesel Engines,” SAE Transactions 66 54 1958
- Alperstein M. Swim W.B. Schwitzer P.H. “Fumigation Kills Smoke-Improves Diesel Performance,” SAE Transactions 66 574 595 1958
- Gupta C.P. “Effects of Multiple Introduction of Fuel in Compression Ignition Engines,” The University of Wisconsin 1964
- Lyn W.T. “An Experimental Investigation into the Effect of Fuel Addition to Intake Air on the Performance of a Compression-ignition Engine,” Proc.IMechE 168 9 265 1954
- Hil R.W. Lawrence C.S. Clarke D.P. Needham J.R. “The Optimized Direct Injection Diesel Engine for Future Passenger Cars,” SAE 880419 February 1988
- Shimada T. Shoji T. Takeda Y. “The Effect of Fuel Injection Pressure on Diesel Engine Performance,” SAE 891919 September 1989
- Kwon S.-I. Arai M. Hiroyasu H. “Effects of Fumigated Fuel on the Ignition and Initial Combustion Stages in a D.I. Diesel Engine,” SAE 891880 September 1989
- Flanagan R.C. Menard L.I. “Controlled Combustion of Low Cetane Tar Sands Fuels in High Speed Engines,” Canadian Section of The Combustion Institute, Spring Technical Meeting May 31 june 2 1989
- Schulte H. Scheid E. Pischinger F. Reuter U. “Preinjection - A measure to Influence Exhaust Quality and Noise of Diesel Engines,” FEV Technical Report Aachen 1989
- Hames R.J. Straub R.D. Amann R.W. “DDEC - Detroit Electronic Diesel Control,” SAE 850542 1985
- Brown W. “Methods for Evaluating Requirements and Errors in Cylinder Pressure Measurements,” SAE 670008 1967
- Lancaster D.R. Krieger R.B. Lienesch J.H. “Measurements and Analysis of Pressure Data,” SAE 750026 1975
- Olikara C. Borman G.L. “A Computer Program for Calculating Properties of Equilibrium Combustion Products with Some Applications to I.C. Engines,” SAE 750468 1975
- Annand W.J.D. “Heat Transfer in the Cylinders of Reciprocating Internal Combustion Engines,” Proc.IMechE 177 36 973 1963
- Bair B. “Ignition Quality and Composition of Fuel Volatile Fraction: Effects on Diesel Combustion.” University of Wisconsin-Madison 1989