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Spray Combustion in Diesel Engines
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English
Abstract
A computer program, which applies the group combustion theory with a comprehensive treatment of thermal radiation to diesel engines, has been developed. A quasi-steady simulation including gas and liquid droplets flows, gas-to-droplets and droplets-to-droplets interactions, turbulence, finite chemical rate, and radiation heat transfer was made. The fuel droplets' penetration, evaporation, mixing with air, and combustion can be clearly simulated.
Four distinct regions were identified in the spray plume: namely, preheat, incipient combustion, intense combustion and diffusion zones. Group combustion numbers that account for the most significant in-cylinder combustion factors, such as fuel/air motion, fuel/air ratio, droplet size, droplet spacing and droplet number density, possess decisive influence on the sizes of these zones. To design a smart diesel engine of better combustion efficiency, lower peak flame temperature and smaller engine size, one needs to select an optimum group combustion number to minimize the preheat and diffusion zones and maintains proper incipient and intense combustion zones.
Coupling of thermal radiation and combustion has a significant effect on diesel engine combustion processes: the concentration distributions of soot and combustion gases, which are required to quantify thermal radiation, can be obtained from combustion calculations, while, the enhanced radiation heat transfer from these soot and combustion gases has a great effect on combustion calculations.
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Citation
Wang, C. and Chang, S., "Spray Combustion in Diesel Engines," SAE Technical Paper 881252, 1988, https://doi.org/10.4271/881252.Also In
References
- Lyn W.T. Valdmanis E. “The Applications of High speed Schlieren Photograph to Diesel Combustion Research,” The Journal of Photograph Science 10 1962
- Alcock J.F. Scott W.M. “Some More Light on Diesel Combustion,” Proc. I. Mech. E. (Auto Division), No.5 179 200 1962-63
- Scott W.M. “Looking in on Diesel Combustion,” SAE Paper 69002 1969
- Rife J.M. Heywood J.B. “Photographic and Performance Studies of Diesel Combustion Using Using a Rapid Compression Machine,” SAE Paper 740948 1974
- Lyn W.T. “Study of the Burning Rate and Nature of Combustion in Diesel Engines,” IX International Symposium on combustion 1982
- Waton N. Pilley A.D. Marzouk M. “A Combustion Correlation for Diesel Engine Simulation,” Automotive Engineering Congress and Exposition Detroit, Michigan SAE Paper 800029 Feb. 1980
- Shahed S.M. Chiu W.S. Lyn W.T. “A Mathematical Model of Diesel Combustion,” Conference on “Combustion in Engines,” Institute of Mechanical Engineers, Cranfield, England 1975
- Chiu W.S. Shahed S.M. Lyn W.T. “A Transient Spray Mixing Model for Diesel Combustion,” Automotive Engineering Congress and Exposition Detroit, Michigan SAE Paper 760128 Feb. 1976
- Heywood J.B. “Engine Combustion Modeling - An Overview,” Combustion Modeling in Reciprocating Engines Mattavi J.N. Amann C.A. 33 35 Plenum Publishing Corp. New York 1980
- Chigier N.A. “Group Combustion Models and Laser Diagnostic Methods in Spray, A review,” Combustion and Flame 51 127 139 1983
- Suzuki T. Chiu H.H. “Multi-Droplet Combustion of Liquid Propellants,” Proceedings of the Ninth International Symposium on Space Technology and Science Tokyo, Japan 145 154 1971
- Zhang X.C Chiu H.H. “Computational Combustion Model of Thrust Augmentor for Airbreathing Engines,” AIAA 23rd Aerospace Sciences Meeting Reno, Navada Jan. 1985
- Chang S.L. Rhee K.T. “An Analytical Method of Non-Gray Three-Dimensional Radiation Heat Transfer in Spray Combustion,” ASME Winter Annual Meeting, 86-WA/HT-17 Anaheim, Ca. 1986
- Chang S.L. Yang X.L. Rhee K.T. “A Parametric Analysis of Radiation Heat Transfer in Direct Injection Diesel Combustion,” Int. Symposium on Diagnostics and Modeling in Reciprocating Engines Tokyo, Japan Sept. 4-6, 1985
- Chang S.L. Rhee K.T. “Computation of Radiation Heat Transfer in Diesel Combustion,” SAE Paper 831332 1983
- Lee S.C. Tien C.L. “Optical Constants of Soot in Hydrocarbon Flame,” 18th Int. Symposium on Combustion The Combustion Institute 1159 1165 1981
- Edward D.K. Balakrishnan A. “Thermal Radiation by Combustion Gases,” Int. J. of Heat and Mass Transfer 16 25 40 1973
- Patankar S.V. “Numerical Heat Transfer and Fluid Flow” McGraw-Hill Book Company New York 1980