Large-Eddy Simulation of ECN Spray A: Sensitivity Study on Modeling Assumptions

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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.

Original languageEnglish
Article number33360
Number of pages24
JournalEnergies
Volume13
Issue number13
DOIs
Publication statusPublished - 1 Jul 2020
MoE publication typeA1 Journal article-refereed

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

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