LES of explosion flame wrinkling

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The large eddy simulation (LES) model is suggested to simulate a wrinkled premixed flame propagation in large-scale gaseous explosions. The model combines filtered progress variable equation to model flame front propagation and gradient method for combustion rate modelling. Renormalisation group theory was employed to simulate subgrid scale wrinkling, to calculate effective turbulent viscosity, effective Prandtle and Shmidt numbers. The model was applied to simulate: a) stoichiometric hydrogen-air deflagration in 2.3 diameter closed spherical vessel, b) initial stage of 10.5% (vol.) methane-air deflagration in 547 m3 vented rectangular enclosure. The suggested technique was capable to resolve explicitly down to the order of LES filter size the flame front wrinkling (cells), caused by hydrodynamic instability, and to reproduce correctly the flame front propagation velocity observed in experiment. Wrinkling factor and fractal dimension of the developing flame front structure were obtained in simulations and compared against available experimental data and theoretical predictions.
LanguageEnglish
Title of host publicationUnknown Host Publication
Pages643-652
Number of pages10
Publication statusPublished - Sep 2004
EventFourth International Seminar on Fire and Explosion Hazards -
Duration: 1 Sep 2004 → …

Conference

ConferenceFourth International Seminar on Fire and Explosion Hazards
Period1/09/04 → …

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wrinkling
flame propagation
large eddy simulation
explosions
flames
deflagration
premixed flames
group theory
propagation velocity
air
enclosure
vessels
fractals
methane
hydrodynamics
viscosity
filters
gradients
propagation
hydrogen

Cite this

Makarov, D., & Molkov, V. (2004). LES of explosion flame wrinkling. In Unknown Host Publication (pp. 643-652)
Makarov, Dmitriy ; Molkov, Vladimir. / LES of explosion flame wrinkling. Unknown Host Publication. 2004. pp. 643-652
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abstract = "The large eddy simulation (LES) model is suggested to simulate a wrinkled premixed flame propagation in large-scale gaseous explosions. The model combines filtered progress variable equation to model flame front propagation and gradient method for combustion rate modelling. Renormalisation group theory was employed to simulate subgrid scale wrinkling, to calculate effective turbulent viscosity, effective Prandtle and Shmidt numbers. The model was applied to simulate: a) stoichiometric hydrogen-air deflagration in 2.3 diameter closed spherical vessel, b) initial stage of 10.5{\%} (vol.) methane-air deflagration in 547 m3 vented rectangular enclosure. The suggested technique was capable to resolve explicitly down to the order of LES filter size the flame front wrinkling (cells), caused by hydrodynamic instability, and to reproduce correctly the flame front propagation velocity observed in experiment. Wrinkling factor and fractal dimension of the developing flame front structure were obtained in simulations and compared against available experimental data and theoretical predictions.",
author = "Dmitriy Makarov and Vladimir Molkov",
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Makarov, D & Molkov, V 2004, LES of explosion flame wrinkling. in Unknown Host Publication. pp. 643-652, Fourth International Seminar on Fire and Explosion Hazards, 1/09/04.

LES of explosion flame wrinkling. / Makarov, Dmitriy; Molkov, Vladimir.

Unknown Host Publication. 2004. p. 643-652.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - LES of explosion flame wrinkling

AU - Makarov, Dmitriy

AU - Molkov, Vladimir

PY - 2004/9

Y1 - 2004/9

N2 - The large eddy simulation (LES) model is suggested to simulate a wrinkled premixed flame propagation in large-scale gaseous explosions. The model combines filtered progress variable equation to model flame front propagation and gradient method for combustion rate modelling. Renormalisation group theory was employed to simulate subgrid scale wrinkling, to calculate effective turbulent viscosity, effective Prandtle and Shmidt numbers. The model was applied to simulate: a) stoichiometric hydrogen-air deflagration in 2.3 diameter closed spherical vessel, b) initial stage of 10.5% (vol.) methane-air deflagration in 547 m3 vented rectangular enclosure. The suggested technique was capable to resolve explicitly down to the order of LES filter size the flame front wrinkling (cells), caused by hydrodynamic instability, and to reproduce correctly the flame front propagation velocity observed in experiment. Wrinkling factor and fractal dimension of the developing flame front structure were obtained in simulations and compared against available experimental data and theoretical predictions.

AB - The large eddy simulation (LES) model is suggested to simulate a wrinkled premixed flame propagation in large-scale gaseous explosions. The model combines filtered progress variable equation to model flame front propagation and gradient method for combustion rate modelling. Renormalisation group theory was employed to simulate subgrid scale wrinkling, to calculate effective turbulent viscosity, effective Prandtle and Shmidt numbers. The model was applied to simulate: a) stoichiometric hydrogen-air deflagration in 2.3 diameter closed spherical vessel, b) initial stage of 10.5% (vol.) methane-air deflagration in 547 m3 vented rectangular enclosure. The suggested technique was capable to resolve explicitly down to the order of LES filter size the flame front wrinkling (cells), caused by hydrodynamic instability, and to reproduce correctly the flame front propagation velocity observed in experiment. Wrinkling factor and fractal dimension of the developing flame front structure were obtained in simulations and compared against available experimental data and theoretical predictions.

M3 - Conference contribution

SN - 1 85923 186 1

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BT - Unknown Host Publication

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Makarov D, Molkov V. LES of explosion flame wrinkling. In Unknown Host Publication. 2004. p. 643-652