Large-eddy simulation on the influence of injection pressure in reacting Spray A

Heikki Kahila, Armin Wehrfritz, Ossi Kaario, Mahdi Ghaderi Masouleh, Noud Maes, Bart Somers, Ville Vuorinen

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28 Citations (Scopus)
41 Downloads (Pure)

Abstract

The Engine Combustion Network (ECN) Spray A target case corresponds to high-pressure liquid fuel injection in conditions relevant to diesel engines. Following the procedure by Wehrfritz et al. (2016), we utilize large-eddy simulation (LES) and flamelet generated manifold (FGM) methods to carry out an injection pressure sensitivity study for Spray A at 50, 100 and 150 MPa. Comparison with experiments is shown for both non-reacting and reacting conditions. Validation results in non-reacting conditions indicate relatively good agreement between the present LES and experimental data, with some deviation in mixture fraction radial profiles. In reacting conditions, the simulated flame lift-off length (FLOL) increases with injection pressure, deviating from the experiments by 4–14%. Respectively, the ignition delay time (IDT) decreases with increasing injection pressure and it is underpredicted in the simulations by 10–20%. Analysis of the underlying chemistry manifold implies that the observed discrepancies can be explained by the differences between experimental and computational mixing processes.

Original languageEnglish
Pages (from-to)142-159
Number of pages18
JournalCombustion and Flame
Volume191
DOIs
Publication statusPublished - 1 May 2018

Keywords

  • Combustion
  • FGM
  • Ignition
  • Ignition kernels
  • LES
  • Spray A

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