On the geometry of laminar diffusion flames established over a flat plate burner

Computer Science

Scientific paper

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Scientific paper

An experimental study is conducted on a laminar diffusion flame established over a horizontal flat porous burner. The objective of this study is to provide further understanding on the transport mechanisms controlling a diffusion flame, with particular interest on the role of buoyancy. Fuel (ethane) is injected through the burner and the oxidiser is provided by a forced flow parallel to the surface. Experiments are conducted in normal and micro-gravity (5 sec. drop tower and parabolic flights). The parameters varied are the air forced flow velocity, oxygen concentration and the fuel injection velocity. The flame is found to establish where fuel and oxidiser rates of delivery are in stoichiometric proportions. Experimental results and a scaling analysis of the region close to the flame are compared and the good agreement between theory and experiments confirms the important role of gravity in the determination of the geometry of a diffusion flame.

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