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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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

Fingerprint

Large eddy simulation
large eddy simulation
sprayers
injection
liquid injection
fuel injection
liquid fuels
diesel engines
Fuel injection
Liquid fuels
ignition
Ignition
Diesel engines
engines
flames
Time delay
time lag
Experiments
chemistry
Engines

Keywords

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

Cite this

Kahila, Heikki ; Wehrfritz, Armin ; Kaario, Ossi ; Ghaderi Masouleh, Mahdi ; Maes, Noud ; Somers, Bart ; Vuorinen, Ville. / Large-eddy simulation on the influence of injection pressure in reacting Spray A. In: Combustion and Flame. 2018 ; Vol. 191. pp. 142-159.
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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.",
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Large-eddy simulation on the influence of injection pressure in reacting Spray A. / Kahila, Heikki; Wehrfritz, Armin; Kaario, Ossi; Ghaderi Masouleh, Mahdi; Maes, Noud; Somers, Bart; Vuorinen, Ville.

In: Combustion and Flame, Vol. 191, 01.05.2018, p. 142-159.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Kahila, Heikki

AU - Wehrfritz, Armin

AU - Kaario, Ossi

AU - Ghaderi Masouleh, Mahdi

AU - Maes, Noud

AU - Somers, Bart

AU - Vuorinen, Ville

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AB - 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.

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