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Atomization and Sprays
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ISSN Druckformat: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v5.i45.70
pages 507-523

TRANSIENT BEHAVIOR IN THE EVOLUTION OF LAMINAR MULTISIZE SPRAY DIFFUSION FLAMES

J. Barry Greenberg
Faculty of Aerospace Engineering, Technion-Israel Institute of Technology, Haifa, 32000, Israel
I. Shpilberg
Faculty of Aerospace Engineering, Technion—Israel Institute of Technology, Haifa, Israel

ABSTRAKT

Recent experimental work by Levy and Bulzan [15] has revealed a pulsating mode of diffusional combustion for a Burke-Schumann flame setup with fuel spray injection. The gross flame pulsations are accompanied by the production of small flamelets at the tip of the main flame, which break off and disappear downstream. In an attempt to uncover the mechanism responsible for these unsteady phenomena, the evolution of a Burke-Schumann type of spray diffusion flame is examined theoretically. Full representation of transport, spray, and combustion is allowed through use of nonunity Lewis numbers for the gaseous components, local pointwise multisize droplet distribution for the spray, and a finite chemical Damkohler number based on a single global chemical reaction. It is found that under certain operating conditions the transient behavior of the spray flame exhibits the phenomenon of flame separation, even though a steady state is ultimately attained. The local polydispersity of the spray is shown to be one of the major factors affecting the appearance of the separated flamelet.


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