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TECHNICAL PAPERS: Internal Combustion Engines

Enhanced Splash Models for High Pressure Diesel Spray

[+] Author and Article Information
L. Allocca

 Istituto Motori CNR, Via Marconi, 8, 80125 Napoli, Italyl.allocca@im.cnr.it

L. Andreassi

 University of Rome “Tor Vergata”, Dip. di Ingegneria Meccanica, Via del Politecnico 1-00133 Rome, Italylucand@mail.mec.uniroma2.it

S. Ubertini

 University of Rome “Tor Vergata”, Dip. di Ingegneria Meccanica, Via del Politecnico 1-00133 Rome, Italystefano.ubertini@uniroma2.it

J. Eng. Gas Turbines Power 129(2), 609-621 (Sep 04, 2006) (13 pages) doi:10.1115/1.2432891 History: Received April 19, 2006; Revised September 04, 2006

Mixture preparation is a crucial aspect for the correct operation of modern direct injection (DI) Diesel engines as it greatly influences and alters the combustion process and, therefore, the exhaust emissions. The complete comprehension of the spray impingement phenomenon is a quite complete task and a mixed numerical-experimental approach has to be considered. On the modeling side, several studies can be found in the scientific literature but only in the last years complete multidimensional modeling has been developed and applied to engine simulations. Among the models available in literature, in this paper, the models by Bai and Gosman (Bai, C., and Gosman, A. D., 1995, SAE Technical Paper No. 950283) and by Lee (Lee, S., and Ryou, H., 2000, Proceedings of the Eighth International Conference on Liquid Atomization and Spray Systems, Pasadena, CA, pp. 586–593; Lee, S., Ko, G. H., Ryas, H., and Hong, K. B., 2001, KSME Int. J., 15(7), pp. 951–961) have been selected and implemented in the KIVA-3V code. On the experimental side, the behavior of a Diesel impinging spray emerging from a common rail injection system (injection pressures of 80 and 120MPa) has been analyzed. The impinging spray has been lightened by a pulsed laser sheet generated from the second harmonic of a Nd-yttrium-aluminum-garnet laser. The images have been acquired by a charge coupled device camera at different times from the start of injection. Digital image processing software has enabled to extract the characteristic parameters of the impinging spray with respect to different operating conditions. The comparison of numerical and experimental data shows that both models should be modified in order to allow a proper simulation of the splash phenomena in modern Diesel engines. Then the numerical data in terms of radial growth, height and shape of the splash cloud, as predicted by modified versions of the models are compared to the experimental ones. Differences among the models are highlighted and discussed.

FIGURES IN THIS ARTICLE
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Copyright © 2007 by American Society of Mechanical Engineers
Topics: Sprays , Diesel
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References

Figures

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Figure 1

Experimental apparatus

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Figure 3

Spray penetration: numerical-experimental comparison at different injection pressures

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Figure 4

Relationship between the maximum ejection angle and the impinging droplet normal Weber

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Figure 6

Profiles of the splash cloud at different time from SOI: experimental-numerical (LR model) comparison

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Figure 8

Contours and thickness of wall film at 500 and 1000μs after impingement—Case No. 4 - LR model

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Figure 12

Predicted film thickness distributions at different times for case No. 4 - LR model

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Figure 13

Predicted film thickness distributions at different times for case No. 8 - BG model

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Figure 14

Predicted film thickness distributions at different times for case No. 8 - LR model

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Figure 11

Predicted film thickness distributions at different times for case No. 4 - BG model

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Figure 9

Contours and thickness of wall films at 500 and 1000μs after impingement—Case No. 8 - BG model

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Figure 5

Profiles of the splash cloud at different time from SOI: experimental-numerical (BG model) comparison

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Figure 2

Schematic diagram of impinging and splashed droplets

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Figure 10

Contours and thickness of wall films at 500 and 1000μs after impingement—Case No. 8 - LR model

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Figure 7

Contours and thickness of wall films at 500 and 1000μs after impingement—Case No. 4 - BG model

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