LES of explosion flame wrinkling

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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.
Original languageEnglish
Title of host publicationUnknown Host Publication
PublisherUlster University
Number of pages10
ISBN (Print)1 85923 186 1
Publication statusPublished (in print/issue) - Sept 2004
EventFourth International Seminar on Fire and Explosion Hazards -
Duration: 1 Sept 2004 → …


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


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