The performance of two spray models for predicting liquid and vapor fuel distribution, combustion and emissions is investigated. The model predictions are compared with extensive data from in-cylinder laser diagnostics carried out in an optically accessible heavy-duty, D. I. diesel engine over a wide range of operating conditions. Top-dead-center temperature and density were varied between 800 K and 1100 K and 11.1 and respectively. Two spray breakup mechanisms were considered: due to Kelvin-Helmholtz (KH) instabilities and to Rayleigh-Taylor (RT) instabilities. Comparisons of a wide range of parameters, which include in-cylinder pressure, apparent heat release rate, liquid fuel penetration, vapor distribution and soot distribution, have shown that a combination of the KH and the RT mechanisms gives realistic predictions. In particular, the limited liquid fuel penetration observed experimentally was captured by including these two competing mechanisms in the spray model. Furthermore, the penetration of the vapor fuel ahead of the liquid spray was also captured. A region of high soot concentration at the spray tip was observed experimentally and also predicted by the KH-RT spray breakup model. [S0742-4795(00)01504-0]
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October 2000
Technical Papers—Special Ice Section
Comparisons of Diesel Spray Liquid Penetration and Vapor Fuel Distributions With In-Cylinder Optical Measurements
Laura M. Ricart,
Laura M. Ricart
Engine Research Center, University of Wisconsin-Madison, Madison, WI 53706
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Rolf D. Reltz,
Rolf D. Reltz
Engine Research Center, University of Wisconsin-Madison, Madison, WI 53706
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John E. Dec
John E. Dec
Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94550
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Laura M. Ricart
Engine Research Center, University of Wisconsin-Madison, Madison, WI 53706
Rolf D. Reltz
Engine Research Center, University of Wisconsin-Madison, Madison, WI 53706
John E. Dec
Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94550
Contributed by the Internal Combustion Engine Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received by the ICE Division October 15, 1998; final revision received by the ASME Headquarters August 31, 1999. Technical Editor: D. Assanis.
J. Eng. Gas Turbines Power. Oct 2000, 122(4): 588-595 (8 pages)
Published Online: August 31, 1999
Article history
Received:
October 15, 1998
Revised:
August 31, 1999
Citation
Ricart , L. M., Reltz, R. D., and Dec, J. E. (August 31, 1999). "Comparisons of Diesel Spray Liquid Penetration and Vapor Fuel Distributions With In-Cylinder Optical Measurements ." ASME. J. Eng. Gas Turbines Power. October 2000; 122(4): 588–595. https://doi.org/10.1115/1.1290591
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