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Talk Abstract
Modeling Flame Spread and Extinction Limits in Low-speed Concurrent Flows

James S. Tien
Department of Mechanical and Aerospace Engineering
Case Western Reserve University
Cleveland, Ohio 44106

The formulation and the numerical solutions of laminar flame spreads over thin solids in low-speed concurrent flows are presented. Flame structure, solid profiles and dominant heat transfer modes will first be discussed for a two-dimensional flame in an unbounded domain. Extinction limits are investigated as a function of flow velocity and ambient oxygen percentage. Particular attention is given to the importance of flame and surface radiation and their effects on extinction limits. Flame spread in a flow tunnel is then investigated. By varying the tunnel height and tunnel wall radaitive properties, the effects of flow confinement and flame-fuel radiative interaction are delineated. Although most of the results are for two-dimensional flames, several computed results will be given to illustrate the effect of three dimensionality in a realistic flow tunnel.

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1999-2000 Reactive Flow and Transport Phenomena