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雾化与喷雾
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ISSN 打印: 1044-5110
ISSN 在线: 1936-2684

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雾化与喷雾

DOI: 10.1615/AtomizSpr.2011003978
pages 591-609

CFD SIMULATION OF DIESEL SPRAYS OVER A WIDE RANGE OF AMBIENT GAS DENSITIES USING AN IMPROVED GAS JET SPRAY MODEL

Choong Hoon Lee
Department of Automotive Engineering, Seoul National University of Science and Technology Seoul 139-743, Korea
Y. Wang
Engine Research Center, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA
Rolf D. Reitz
Engine Research Center, University of Wisconsin-Madison, Rm 1018A, 1500 Engineering Drive, Madison, Wisconsin 53706, USA

ABSTRACT

The spray tip penetration of diesel sprays was simulated over wide ranges of ambient gas densities using a uniform profile gas jet model equation, which uses the concept of an effective injection velocity. The spray tip penetration obtained with this correlation equation shows a nearly complete match with available experimental data over the range of ambient gas densities from 3.6 to 124 kg/m3. The spray penetration over this wide range of ambient gas densities was also simulated using the KIVA code, which was implemented with various gas jet submodels, including uniform profile and normal or Gaussian gas jet profile models. The effects of the model’s gas entrainment coefficient K and breakup length coefficient Cb on the spray penetration were investigated by parametric studies. Improved predictions of the spray tip penetration where obtained using the Normal Gas Jet Profile model with an entrainment coefficient K = 0.7, in agreement with previous research. An optimal breakup length coefficient Cb = 1.9 was also found when the model includes both the ambient gas density and the spray cone angle as parameters.


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