Three-Dimensional Computations of Diesel Sprays in a Very High Pressure Chamber

Hou, Zhixin; Abraham, John; Siebers, Dennis L.

doi:10.4271/941896

Cited by 8 publications

(4 citation statements)

References 15 publications

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“…4, even when variable liquid density is considered in the Spalding model. SPRAY VAPORIZATION -The effect of the High Pressure and Spalding models on spray vaporization was tested by comparing the models to the experiments done by Kamimoto et al [33] and Hou et al [34]. The computations were done in 2 dimensions with 0.7x0.7 mm cell sizes.…”

Section: Resultsmentioning

confidence: 99%

“…Before applying the model to diesel sprays, single droplet computations were done to examine the behavior of the High Pressure model, then the KIVA-II code with both models was run separately to simulate the vaporizing spray experiments of Kamimoto et al [33] and Hou at al. [34] before simulating the combustion process in the Caterpillar engine.…”

Section: Resultsmentioning

confidence: 99%

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A New High Pressure Droplet Vaporization Model for Diesel Engine Modeling

Curtis

Uludogan

Reitz

1995

SAE Technical Paper Series

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A droplet vaporization model has been developed for use in high pressure spray modeling. The model is a modification of the common Spalding vaporization model that accounts for the effects of high pressure on phase equilibrium, transport properties, and surface tension. The new model allows for a nonuniform temperature within the liquid by using a simple 2-zone model for the droplet. The effects of the different modifications are tested both for the case of a single vaporizing droplet in a quiescent environment as well as for a high pressure spray using the KIVA II code. Comparisons with vaporizing spray experiments show somewhat improved spray penetration predictions. Also, the effect of the vaporization model on diesel combustion predictions was studied by applying the models to simulate the combustion process in a heavy duty diesel engine. In this case the standard and High Pressure vaporization models were found to give similar heat release and emissions results. However, the results show that a more realistic representation of the vaporization process is achieved with the new model. In particular, less unburned fuel is predicted to remain in the combustion chamber late in the power stroke.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A New High Pressure Droplet Vaporization Model for Diesel Engine Modeling

Curtis

Uludogan

Reitz

1995

SAE Technical Paper Series

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“…These approaches to spray computations and modeling have been assessed for accuracy through comparisons with measurements. Such comparisons of computed and measured parameters have been presented in the literature for steady sprays and include those of drop sizes and drop and gas velocities (Bracco, 1985;Andrews and Bracco, 1989;Tomboulides et al, 1991;Hou et al, 1994;Macinnes and Bracco, 1994). However, sprays in diesel engines are transient.…”

Section: Introductionmentioning

confidence: 97%

“…In spite of the progress in the area of computing and modeling steady sprays, extensive comparisons of the computed and measured structure of transient sprays are missing. Recently, comparisons have been presented of tip penetration for transient sprays (Hou et al, 1994). However, it would appear that, to assess the accuracy of reproducing the transient spray structure, at the very least, there should be simultaneous comparisons of tip penetration' and dispersion angle ofjets.…”

Section: Introductionmentioning

confidence: 99%

Penetration and Dispersion of Transient Gas Jets and Sprays

Iyer

Abraham

1997

Combustion Science and Technology

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Results from numerical computations performed to represent the transient behavior of axisymmetric non-vaporizing and vaporizing sprays injected into a constant volume chamber are presented. These results are compared with those from vaporizing spray experiments where, for the same mass and momentum flow rates, the effect of chamber density on spray penetration and dispersion angle was studied. It is shown that with the practical numerical resolution employed here, which appears to be inadequate, the results do not agree. Higher resolution is impractical from a numerical point of view for sprays. Hence, the present work further explores whether gas jets, which may be computed with a high resolution, are comparable to the sprays in terms of penetration and dispersion angle. For each gas jet computation, the injected mass and momentum flow rates and the chamber density in the corresponding gas jet computations are maintained the same as those in the spray experiments. Comparisons show that the gas jet penetration and angles are in agreement with the trends of the spray measurements. In both cases. the penetration decreases with increasing chamber density and the dispersion angle increases.

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