An investigation on the impact of small-scale models in gasoline direct injection sprays (ECN Spray G)

Salvador Navarro-Martinez, Giovanni Tretola, Mohammad Reza Yosri, Konstantina Vogiatzaki, Robert Gordon

Research output: Contribution to journalArticle

Abstract

The work presents a numerical investigation of gasoline direct injection and the resulting early development of spray plumes from an eight-hole injector (Engine Combustion Network Spray G). The objective is to evaluate the impact on the droplet size distribution (DSD) statistics from the assumed model physics, particularly for the small scales. Two modelling approaches are compared: Eulerian–Lagrangian spray atomisation with adaptive mesh refinement and a stochastic fields transported probability density function method. The two models simulate the small scales and sub-grid droplet physics with different approaches, but based on the same concept of transport of liquid surface density. Both approaches predict similar liquid distributions in the near-field comparable to experimental measurements. The spray break-up patterns are very similar and both models reproduce quasi-log-normal droplet distributions, with same overall Sauter mean diameters. The Eulerian–Lagrangian spray atomisation with probability density function approach shows different break-up behaviour between droplets originating from the dilute region and those originating from the dense core region. The transition from Eulerian to Lagrangian can be observed in the Eulerian–Lagrangian spray atomisation with adaptive mesh refinement predicted distribution with an abrupt change in the DSD. Both methods are able to produce similar DSD below filter width/grid size resolution.
Original languageEnglish
Pages (from-to)217-225
Number of pages9
JournalInternational Journal of Engine Research
Volume21
Issue number1
DOIs
Publication statusPublished - 26 Nov 2019

Keywords

  • spray combustion
  • Spray G
  • Eulerian–Lagrangian
  • stochastic fields methods
  • Engine Combustion Network
  • droplet break-up models
  • Gasoline
  • fuel sprays
  • Eulerian–Lagrangian spray atomisation
  • Engine Combustion Network Spray G

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