Title: Modelling of burner stabilised oxy-fuel flames by using non-premixed and partially-premixed turbulent combustion models

Authors: M.C. Van Rossum, R.J.M. Bastiaans, D.J.E.M. Roekaerts, L.P.H. De Goey

Addresses: Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands; Shell Global Solutions International, P.O. Box 38000, 1030 BN Amsterdam, The Netherlands. ' Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands. ' Delft University of Technology, P.O. Box 5, 2600 AA Delft, The Netherlands. ' Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

Abstract: The turbulent flow and combustion process of oxy-fuel flames are studied in the wake behind a burner rim separating fuel and oxidiser inlet channels. A range of conditions was considered, from stably attached flames, via lifted flames to blow-off. It was found that the chemical equilibrium model did not predict the chemical composition well. The laminar flamelet model performed better. It appeared that extinction is not the mechanism that leads to a lifted flame and therefore partial premixing was considered. It appeared that lifted oxy-fuel flames can be predicted fairly well by adjusting a turbulent burning velocity constant.

Keywords: turbulent combustion modelling; oxy-fuel flames; flame-lift; stabilisation; turbulent flow; burner rim separating fuel; oxidiser inlet channels; chemical equilibrium model; laminar flamelet model; partial premixing; turbulent burning velocity constant; CFD; computational fluid dynamics.

DOI: 10.1504/PCFD.2006.011321

Progress in Computational Fluid Dynamics, An International Journal, 2006 Vol.6 No.8, pp.487 - 497

Published online: 17 Nov 2006 *

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