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Abstract

The largest known experiment on hydrogen-air deflagration in the open atmosphere has been analysed by means of the large eddy simulation (LES). The combustion model is based on the progress variable equation to simulate a premixed flame front propagation and the gradient method to decouple the physical combustion rate from numerical peculiarities. The hydrodynamic instability has been partially resolved by LES and unresolved effects have been modelled by Yakhot's turbulent premixed combustion model. The main contributor to high flame propagation velocity is the additional turbulence generated by the flame front itself. It has been modelled based on the maximum flame wrinkling factor predicted by Karlovitz et al. theory and the transitional distance reported by Gostintsev with colleagues. Simulations are in a good agreement with experimental data on flame propagation dynamics, flame shape, and outgoing pressure wave peaks and structure. The model is built from the first principles and no adjustable parameters were applied to get agreement with the experiment. (C) 2007 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.

Year of Publication
2007
Journal
International Journal of Hydrogen Energy
Volume
32
Number of Pages
2198-2205
ISBN Number
0360-3199
Accession Number
WOS:000250062900013
DOI
10.1016/j.ijhydene.2007.04.021
Alternate Journal
Int J Hydrogen Energ
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