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Atomization and Sprays
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ISSN 印刷: 1044-5110
ISSN オンライン: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v20.i8.50
pages 737-747

MODELING OF THE PROCESSES IN DIESEL ENGINE−LIKE CONDITIONS: EFFECTS OF FUEL HEATING AND EVAPORATION

Walid A. Abdelghaffar
Mechanical Engineering Department, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt; School of Engineering, Faculty of Science and Engineering, University of Brighron, Cockroft Building, BN 2 4GJ, UK
A. E. Elwardany
Sir Harry Ricardo Laboratories, School of Computing, Engineering and Mathematics, Faculty of Science and Engineering, University of Brighton, Brighton BN2 4GJ UK
Sergei S. Sazhin
Advanced Engineering Centre, School of Computing, Engineering and Mathematics, University of Brighton, Brighton, BN2 4GJ, UK

要約

The results of modeling fluid dynamics, heat/mass transfer, and combustion processes in diesel engine-like conditions are presented with a view to establishing the effects of droplet heating and evaporation models on the prediction of spray penetration, in-cylinder gas pressure, and the amount of fuel vapor, O2, CO2, CO, and NO. The following models have been studied: the infinite thermal conductivity (ITC) and effective thermal conductivity (ETC) liquid phase models, the basic gas phase model, and the gas phase model suggested by Abramzon and Sirignano (1989). A modified version of the TAB (Taylor analogy breakup) model was used for modeling the droplet breakup process. It is pointed out that the ETC model leads to the prediction of shorter spray penetration, in agreement with experimental data, when compared with the ITC model. The effect of the liquid phase model on predicted gas pressure in diesel engines is shown to be relatively weak. The predicted amounts of fuel vapor, O2, CO2, CO, and NO are strongly affected by the choice of the liquid phase model but practically unaffected by the choice of the gas phase model.


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