Large-Eddy Simulation of ECN Spray A: Sensitivity Study on Modeling Assumptions
Loading...
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Date
2020-07-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
24
Series
Energies, Volume 13, issue 13
Abstract
In this study, various mixing and evaporation modeling assumptions typically considered for large-eddy simulation (LES) of the well-established Engine Combustion Network (ECN) Spray A are explored. A coupling between LES and Lagrangian particle tracking (LPT) is employed to simulate liquidn-dodecane spray injection into hot inert gaseous environment, wherein Lagrangian droplets are introduced from a small cylindrical injection volume while larger length scales within the nozzle diameter are resolved. This LES/LPT approach involves various modeling assumptions concerning the unresolved near-nozzle region, droplet breakup, and LES subgrid scales (SGS) in which their impact on common spray metrics is usually left unexplored despite frequent utilization. Here, multi-parametric analysis is performed on the effects of (i) cylindrical injection volume dimensions, (ii) secondary breakup model, particularly Kelvin-Helmholtz Rayleigh-Taylor (KHRT) against a no-breakup model approach, and (iii) LES SGS models, particularly Smagorinsky and one-equation models against implicit LES. The analysis indicates the following findings: (i) global spray characteristics are sensitive to radial dimension of the cylindrical injection volume, (ii) the no-breakup model approach performs equally well, in terms of spray penetration and mixture formation, compared with KHRT, and (iii) the no-breakup model is generally insensitive to the chosen SGS model for the utilized grid resolution.Description
Keywords
spray modeling, large-eddy simulation, Lagrangian particle tracking, droplet-laden, multiphase, turbulence, subgrid scale, droplet breakup, evaporation, ECN, OpenFOAM, X-RAY RADIOGRAPHY, DIESEL SPRAY, HIGH-PRESSURE, FUEL-SPRAY, DROPLET VAPORIZATION, FLAME STRUCTURE, LIQUID JET, BREAK-UP, ATOMIZATION, INJECTION
Other note
Citation
Gadalla, M, Kannan, J, Tekgul, B, Karimkashi, S, Kaario, O & Vuorinen, V 2020, ' Large-Eddy Simulation of ECN Spray A : Sensitivity Study on Modeling Assumptions ', Energies, vol. 13, no. 13, 33360 . https://doi.org/10.3390/en13133360