An insight on the spray-A combustion characteristics by means of RANS and LES simulations using flamelet-based combustion models

B. Akkurt, H.Y. Akargün, L.M.T. Somers (Supervisor), N.G. Deen (Supervisor), R. Novella, E. J. Perez-Sanchez

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

1 Citation (Scopus)

Abstract

Advanced Computational Fluid Dynamics (CFD) modeling of reacting sprays provides access to information not available even applying the most advanced experimental techniques. This is particularly evident if the combustion model handles detailed chemical kinetic models efficiently to describe the fuel auto-ignition and oxidation processes. Complex chemistry also provides the temporal evolution of key species closely related to emissions formation, such as polycyclic aromatic hydrocarbons (PAHs) that are well-known as soot precursors. In this framework, present investigation focuses on the analysis of the so-called Spray-A combustion characteristics using two different flamelet-based combustion models. Both Reynolds-Averaged Navier-Stokes (RANS) and Large-Eddy Simulation (LES) predictions are combined to study not only the averaged spray characteristics, but also the relevance of different realizations in this particular problem. The discussion includes an evaluation of the performance of the models to predict the most relevant reacting spray macro-parameters: ignition delay and lift-off length (LOL). This is followed by the description of the temporal evolution and localization of key species during auto-ignition and flame stabilization in spatial coordinates and in the mixture fraction-progress variable space. The internal structure of the quasi-steady flame is also discussed so that the localization of key species, including PAHs, is investigated following a similar approach. Finally, the study is completed by analyzing the sensitivity of the results to the chemical mechanism and to the boundary conditions imposed for the applied manifold generation. Preliminary results show how the two models predict the auto-ignition and combustion onset in slightly rich conditions. Additionally, differences in LOL reflect on the structure of the establishing flame, so the proper prediction of the spray mixing field and the LOL is mandatory to model chemical species, especially PAHs. Dispersion effects observed analyzing different realizations are of second order for Spray-A reference conditions. Finally, it is found that the results are sensitive to chemical mechanism and evaporation must be taken into account in the simulation of the flamelets that determine the manifold.
LanguageEnglish
Title of host publicationSAE 2017 World Congress and Exhibition, 4-6 April 2017, Detroit, Michigan
Place of Publications.l.
PublisherSociety of Automotive Engineers (SAE)
Pages1-9
DOIs
StatePublished - 28 Mar 2017
Event2017 SAE World Congress Experience (WCX 2017) - Cobo Center, Detroit, United States
Duration: 4 Apr 20176 Apr 2017
https://www.fisita.com/events/diary/wcx17-sae-world-congress-experience

Publication series

NameSAE Technical Papers
Volume2017-01-0577

Conference

Conference2017 SAE World Congress Experience (WCX 2017)
Abbreviated titleWCX 2017
CountryUnited States
CityDetroit
Period4/04/176/04/17
Internet address

Fingerprint

Large eddy simulation
Ignition
Polycyclic aromatic hydrocarbons
Soot
Reaction kinetics
Macros
Computational fluid dynamics
Evaporation
Stabilization
Boundary conditions
Oxidation

Keywords

  • Flamelet Generated Manifolds (FGM)
  • flamelet model
  • RANS
  • Large Eddy Simulations
  • Spray A

Cite this

Akkurt, B., Akargün, H. Y., Somers, L. M. T., Deen, N. G., Novella, R., & Perez-Sanchez, E. J. (2017). An insight on the spray-A combustion characteristics by means of RANS and LES simulations using flamelet-based combustion models. In SAE 2017 World Congress and Exhibition, 4-6 April 2017, Detroit, Michigan (pp. 1-9). (SAE Technical Papers; Vol. 2017-01-0577). s.l.: Society of Automotive Engineers (SAE). DOI: 10.4271/2017-01-0577
Akkurt, B. ; Akargün, H.Y. ; Somers, L.M.T. ; Deen, N.G. ; Novella, R. ; Perez-Sanchez, E. J./ An insight on the spray-A combustion characteristics by means of RANS and LES simulations using flamelet-based combustion models. SAE 2017 World Congress and Exhibition, 4-6 April 2017, Detroit, Michigan. s.l. : Society of Automotive Engineers (SAE), 2017. pp. 1-9 (SAE Technical Papers).
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abstract = "Advanced Computational Fluid Dynamics (CFD) modeling of reacting sprays provides access to information not available even applying the most advanced experimental techniques. This is particularly evident if the combustion model handles detailed chemical kinetic models efficiently to describe the fuel auto-ignition and oxidation processes. Complex chemistry also provides the temporal evolution of key species closely related to emissions formation, such as polycyclic aromatic hydrocarbons (PAHs) that are well-known as soot precursors. In this framework, present investigation focuses on the analysis of the so-called Spray-A combustion characteristics using two different flamelet-based combustion models. Both Reynolds-Averaged Navier-Stokes (RANS) and Large-Eddy Simulation (LES) predictions are combined to study not only the averaged spray characteristics, but also the relevance of different realizations in this particular problem. The discussion includes an evaluation of the performance of the models to predict the most relevant reacting spray macro-parameters: ignition delay and lift-off length (LOL). This is followed by the description of the temporal evolution and localization of key species during auto-ignition and flame stabilization in spatial coordinates and in the mixture fraction-progress variable space. The internal structure of the quasi-steady flame is also discussed so that the localization of key species, including PAHs, is investigated following a similar approach. Finally, the study is completed by analyzing the sensitivity of the results to the chemical mechanism and to the boundary conditions imposed for the applied manifold generation. Preliminary results show how the two models predict the auto-ignition and combustion onset in slightly rich conditions. Additionally, differences in LOL reflect on the structure of the establishing flame, so the proper prediction of the spray mixing field and the LOL is mandatory to model chemical species, especially PAHs. Dispersion effects observed analyzing different realizations are of second order for Spray-A reference conditions. Finally, it is found that the results are sensitive to chemical mechanism and evaporation must be taken into account in the simulation of the flamelets that determine the manifold.",
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Akkurt, B, Akargün, HY, Somers, LMT, Deen, NG, Novella, R & Perez-Sanchez, EJ 2017, An insight on the spray-A combustion characteristics by means of RANS and LES simulations using flamelet-based combustion models. in SAE 2017 World Congress and Exhibition, 4-6 April 2017, Detroit, Michigan. SAE Technical Papers, vol. 2017-01-0577, Society of Automotive Engineers (SAE), s.l., pp. 1-9, 2017 SAE World Congress Experience (WCX 2017), Detroit, United States, 4/04/17. DOI: 10.4271/2017-01-0577

An insight on the spray-A combustion characteristics by means of RANS and LES simulations using flamelet-based combustion models. / Akkurt, B.; Akargün, H.Y.; Somers, L.M.T. (Supervisor); Deen, N.G. (Supervisor); Novella, R.; Perez-Sanchez, E. J.

SAE 2017 World Congress and Exhibition, 4-6 April 2017, Detroit, Michigan. s.l. : Society of Automotive Engineers (SAE), 2017. p. 1-9 (SAE Technical Papers; Vol. 2017-01-0577).

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Akkurt B, Akargün HY, Somers LMT, Deen NG, Novella R, Perez-Sanchez EJ. An insight on the spray-A combustion characteristics by means of RANS and LES simulations using flamelet-based combustion models. In SAE 2017 World Congress and Exhibition, 4-6 April 2017, Detroit, Michigan. s.l.: Society of Automotive Engineers (SAE). 2017. p. 1-9. (SAE Technical Papers). Available from, DOI: 10.4271/2017-01-0577