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LES of explosion flame wrinkling

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Makarov, Dmitriy and Molkov, Vladimir (2004) LES of explosion flame wrinkling. In: Fourth International Seminar on Fire and Explosion Hazards. University of Ulster. 10 pp. [Conference contribution]

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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.

Item Type:Conference contribution (Paper)
Faculties and Schools:Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute
Built Environment Research Institute > Hydrogen Safety Engineering and Research Centre (HySAFER)
ID Code:15414
Deposited By:Professor Vladimir Molkov
Deposited On:30 Aug 2010 12:12
Last Modified:30 Aug 2010 12:12

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