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雾化与喷雾
影响因子: 1.262 5年影响因子: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN 打印: 1044-5110
ISSN 在线: 1936-2684

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雾化与喷雾

DOI: 10.1615/AtomizSpr.2013006784
pages 297-325

LARGE EDDY SIMULATION OF HIGH GAS DENSITY EFFECTS IN FUEL SPRAYS

Ossi Kaario
Department of Mechanical Engineering, Aalto University, Aalto, Finland
Ville Vuorinen
Aalto University, School of Engineering, TKK, Internal Combustion Engine Research Group, Department of Energy Technology, Helsinki University of Technology, Finland
Tuomo Hulkkonen
Aalto University, Department of Energy Technology, Aalto University, FI-00076 Aalto, Finland
K. Keskinen
Aalto University School of Engineering, P.O. Box 14300, FIN-00076, Aalto, Finland
M. Nuutinen
Aalto University School of Engineering, P.O. Box 14300, FIN-00076, Aalto, Finland
Martti Larmi
Department of Mechanical Engineering, Aalto University, Aalto, Finland
Franz X. Tanner
Department of Mathematical Sciences, Michigan Technological University, Houghton, MI 49931, USA

ABSTRACT

The paper focuses on the physics of sprays using large eddy simulation (LES) and Lagrangian particle tracking (LPT). The LES/LPT was compared to previously unpublished experimental fuel spray data in two ambient gas densities, 39 and 115 kg/m3. The higher density case corresponds to a near-future engine environment with maximum cylinder pressure of the order of 300 bar, whereas the lower density case resembles typical present-day engine conditions. The accuracy of the results was quantified by calculating the resolved part of the turbulent kinetic energy and using a LES quality index analysis. The sprays produced by the LES/LPT had many similarities with the experimental sprays. On a global scale, spray penetration, spray opening angle, and spray dispersion were found to be well captured by the LES/LPT. The results indicated that the effect of subgrid scales on particle dispersion was small and hence no explicit particle dispersion model was required. Similarities were also found locally as LES/LPT produced small-scale flow structures indicated by the Q-criterion, preferential concentrations, and voids free of droplets. Finally, we propose a new gas phase mixing indicator in order to quantify turbulent mixing. Results from the novel mixing indicator suggest that for a given spray penetration, the higher ambient gas density spray yields an increased mixing rate.


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