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Injection Orifice Shape: Effects on Combustion and Emission Formation in Diesel Engines
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Abstract
A series of experimental studies of diesel spray combustion was carried out using non-circular and back-step orifices. The experiments were performed in a single-cylinder engine and in a constant volume combustion chamber. In the engine tests, elliptic orifices with an aspect ratio of approximately 2:1 were compared with circular orifices. The elliptic orifices had sharp inlets and the circular orifices had rounded inlets. Elliptic orifices aligned with either the minor axis or the major axis in the direction of the nozzle tip were tested. The orifice shapes had minor effects on the heat release, ignition delay, and emissions of smoke, CO and HC. However, substantial differences were observed for emissions of NOx: for the vertical elliptic orifices, emissions up to 37.6 percent lower than with circular orifices were observed. In the combustion bomb tests, rectangular and back-step orifices were compared with circular orifices, all with sharp inlets. Ignition delay and heat release rates were measured. The differences in combustion characteristics were evaluated and were shown to be negligible.
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Authors
Citation
Jacobsson, L. and Chomiak, J., "Injection Orifice Shape: Effects on Combustion and Emission Formation in Diesel Engines," SAE Technical Paper 972964, 1997, https://doi.org/10.4271/972964.Also In
References
- Zelenka, P. Kriegler, W. Herzog, P.L. Cartellieri, W.P. “Ways Toward the Clean Heavy-Duty Diesel” SAE Paper 900602 1990
- Soteriou, C. Andrews, R. Smith, M. “Direct Injection Diesel Sprays and the Effect of Cavitation and Hydraulic Flip Atomization” SAE Paper 950080 1995
- Ho, C. Gutmark, E. “Vortex induction and mass entrainment in a small-aspect-ratio elliptic jet” J. Fluid Mech. 179 382 405 1987
- Hussain, F. Husain, H.S. “Elliptic jets. Part 1, Characteristics of unexcited and excited jets” Fluid Mech. 208 257 320 1989
- Xi, D.G. Yang, Y.X. Zhang, J.B. Shi, S.X. “Experimental study on spray from nozzles of elliptic orifice” 151 247 Symposium on Flow-Induced Vibration and Noise ASME 7 1992
- Batchelor, G.K. An Introduction to Fluid Dynamics Cambridge Univ. Press 1970
- Yamamoto, H. Niimura, K. “Characteristics of Fuel Sprays from Specially Shaped and Impinging Flow Nozzles” SAE Paper 950082
- Gutmark, E. Schadow, K.C. “Flow characteristics of orifice and tapered jets” Phys. Fluids 30 3448 3454 1987
- Dodge, L.G. Ryan, T.W. III Ryan, M.G. “Effects of Different Injector Hole Shapes on Diesel Sprays” SAE Paper 920623 1992
- Takeda, Y. Ishikawa, N. Komori, M. Tsujimura, K. “Diesel Combustion Improvement and Emissions Reduction Using VCO Nozzles with High Pressure Fuel Injection” SAE Paper 940899 1994
- Nurick, W.H. “Orifice Cavitation and Its Effect on Spray Mixing” Journal of Fluids Engineering 98 681 687 1976
- Ruiz, F. Chigier, N. “The Mechanics of High Speed Atomization” Proceedings, ICLASS-85, Third International Conference on Liquid Atomization and Spray System 1 1985
- Pierpoint, D.A. Reitz, R.D. “Effects on Injection Pressure and Nozzle Geometry on D.I. Diesel Emissions and Performance” SAE Paper 950604 1995
- Ohrn, T.R. Senser, D.W. Lefebvre, A.H. “Geometrical Effects on Discharge Coefficients for Plain-Orifice Atomizers” Atomization and Sprays 1 2 137 153 1991
- Su, T.F. Farrell, P.V. Nagarajan, R.T. “Nozzle Effect on High Pressure Diesel Injection” SAE Paper 950083 1995
- Karasawa, T. Tanaka, M. Abe, K. Shiga, K. Kurabayashi, T. “Effect of Nozzle Configuration on the Atomization of a Steady Spray” Atomization and Sprays 2 411 426 1992
- Goldman, R.N. Weinberg, J.S. Statistics, an introduction Prentice-Hall 0-13-845918-5 1985
- Manual for the AVL Digital Analyzer system 657 1986
- BOSCH ROBERT GMBH Stuttgart 1996
- Carlsson, L. Swedish National Testing and Research Institute 1996
- McHale, R.M. Nurick, W.H. NASA CR-34315 R-9271 Non-circular Orifice Holes and Advanced Fabrication Techniques for Liquid Rocket Injectors, Phases I, II, III, and IV, Rocketdyne Division of Rock-well International Canoga Park, Caif. 1974
- Oishi, Y. Miura, A. Hamazaki, N. Watanabe, Y. “A Computational Study into the Effect of the Injection Nozzle Inclination Angle on the Flow Characteristics in Nozzle Holes” SAE Paper 920580 1992
- Fiskaa, G. “Determination of the Ignition and Combustion Properties for Diesel Fuels by Constant Volume Combustion Rigs” I. Mech. E. Seminar, Fuels for Automotive & Industrial Diesel Engines April 1993
- Datschefski, G. Rickeard, D.J. “Diesel Fuel Ignition Quality Measurements by a Constant Volume Combustion Test” SAE Paper 932743 1993
- Simonsen, H. “Testing and Evaluation of Ignition Improvers for Ethanol in a DI Diesel Engine” Technical lic. 1101-9972 Dept. of Thermo- and Fluid Dynamics, Chalmers University of Technology 1995
- Heywood, J.B. Internal Combustion Engine Fundamentals 1st New York McGraw-Hill Book Company 1988