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Burke–Schumann Flame with Streamwise and Preferential Diffusion

1984; Taylor & Francis; Volume: 37; Issue: 1-2 Linguagem: Inglês

10.1080/00102208408923744

1563-521X

Suk Ho Chung, Chung K. Law,

Fire dynamics and safety research

Abstract The classical diffusion flame model of Burke and Schumann is extended to include the effects of both streamwise and preferential diffusion. The study first identifies a Lewis-number-weighted coupling function as the proper one to usc in formulations involving non-unity Lewis numbers. A perturbation technique is then developed for the realistic situation of ncar-unity Lewis number flows. Results show that, depending on the effective Lewis numbers of fuel and oxidizer, the flame temperature may vary either monotonically or non-monotonically along the flame sheet, and thereby suggesting the possibilities of tip opening, and tip intensification, as well as partial and complete flame blow-off.