THE EFFECT OF THERMAL RADIATION ON THE PROPAGATION OF LAMINAR FLAMES

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Abstract
The effect of radiative heat transfer on the propagation of a laminar diffusion flame is considered analytically. Numerical results show that radiation has an important effect on the behavior of flame propagation. Since the radiative heat transfer to and from the combustion zone depends strongly on the optical distances between the combustion zone and the hot and cold boundaries of a physical system, flame propagation in a radiative participating medium is intrinsically unsteady except in the optically thick and thin limits. The concepts of "steady state" flame thickness and flame speed have no physical meaning. The initial optical thickness of the burnt and unburnt mixture are shown to have important effect on the flame propagating behavior immediately after the two mixtures are brought into contact. The effects of the initial optical thickness of the burnt and unburnt mixture on the flame thickness, flame speed and fuel consumption rate immediately after ignition are illustrated.

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