Modelling of Sub-Grid Scale Reaction Rate Based on a Novel Series Model

Application to a Premixed Bluff-Body Stabilised Flame

Weilin Zeng, Konstantina Vogiatzaki, Salvador Navarro-Martinez, Kai Luo

Research output: Contribution to journalArticleResearchpeer-review

Abstract

In this paper, a new model for closing the sub-grid reaction rate is proposed based on the series expansion of the chemical source term around the filtered value. For validation, large eddy simulations of a bluff-body stabilised premixed flame are performed at three different grid resolutions, and results are compared with experimental data. Simulations neglecting the sub-grid contributions of the source term are also conducted to examine the relative sub-grid contribution. The results show that the series model reproduces correctly key characteristics such as flame anchoring, recirculation zones and shear layers. Statistically, good agreement with experimental data is obtained by the series model, in terms of time-averaged profiles of velocity and its fluctuations, and temperature as well as the size of the recirculation region. With increasing mesh refinement, the “no-model” approach results improve and the predictions are similar (albeit always worse) to those of the series model.
Original languageEnglish
Pages (from-to)1043-1058
Number of pages16
JournalCombustion Science and Technology
Volume191
Issue number5-6
DOIs
Publication statusPublished - 13 Apr 2019

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bluff bodies
Reaction rates
flames
reaction kinetics
grids
premixed flames
shear layers
Large eddy simulation
large eddy simulation
closing
series expansion
profiles
predictions
simulation

Keywords

  • Series model
  • large eddy simulation
  • premixed combustion
  • sub-grid scale reaction rate

Cite this

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title = "Modelling of Sub-Grid Scale Reaction Rate Based on a Novel Series Model: Application to a Premixed Bluff-Body Stabilised Flame",
abstract = "In this paper, a new model for closing the sub-grid reaction rate is proposed based on the series expansion of the chemical source term around the filtered value. For validation, large eddy simulations of a bluff-body stabilised premixed flame are performed at three different grid resolutions, and results are compared with experimental data. Simulations neglecting the sub-grid contributions of the source term are also conducted to examine the relative sub-grid contribution. The results show that the series model reproduces correctly key characteristics such as flame anchoring, recirculation zones and shear layers. Statistically, good agreement with experimental data is obtained by the series model, in terms of time-averaged profiles of velocity and its fluctuations, and temperature as well as the size of the recirculation region. With increasing mesh refinement, the “no-model” approach results improve and the predictions are similar (albeit always worse) to those of the series model.",
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Modelling of Sub-Grid Scale Reaction Rate Based on a Novel Series Model : Application to a Premixed Bluff-Body Stabilised Flame. / Zeng, Weilin; Vogiatzaki, Konstantina; Navarro-Martinez, Salvador; Luo, Kai.

In: Combustion Science and Technology, Vol. 191, No. 5-6, 13.04.2019, p. 1043-1058.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Vogiatzaki, Konstantina

AU - Navarro-Martinez, Salvador

AU - Luo, Kai

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