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APPLICATION OF BEM AND ANALYSIS OF THE ROLE OF RADIATION EFFECTS IN LABSCALE TURBULENT DIFFUSION FLAMES

DOI: 10.1615/ICHMT.2001.RadiationSymp.500
page 8

Aristide Mbiock
International Flame Research Foundation, Research Station b.v. PO Box 10 000, 1970 CA IJmuiden, The Netherlands

Joan Teerling
Delft University of Technology P.O. Box 5046, 2600 GA Delft, The Netherlands

Dirk J.E.M. Roekaerts
Department Process and Energy, Delft University of Technology, Leeghwaterstraat 44, 2628 CA Delft ; Department of Multi-Scale Physics, Delft University of Technology, Leeghwaterstraat 39, 2628 CB Delft

Bart Merci
Department of Mechanics of Flow, Heat and Combustion, Ghent University, St-Pietersnieuwstraat 41, 9000 Gent; and Postdoctoral Fellow of the Fund of Scientific Research - Flanders,Belgium

Abstract

Labscale turbulent diffusion flames often emit a relatively small amount of heat by radiation and this radiative heat loss has been neglected in many studies on turbulence-chemistry interaction models. However, to obtain accurate predictions of quantities which are highly sensitive to temperature such as NOx formation; it is necessary to take into account radiation effects. In the literature a simplified approach based on an “optically thin limit” approximation, considering in addition emission only, has been used [1,2] and such approximation has been recommended at the International Workshops on Measurement and Computation of Turbulent Non-Premixed Flames [2]. In this paper we criticize the use of this simple model because it violates the hypothesis of Local Thermodynamic Equilibrium (LTE) and also compare its predictions for the case of “Sandia Flame D” with the solution of the complete radiative energy balance equation obtained using by the most accurate solution method, the boundary element method (BEM).

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