Abstract
— The Bray-Moss-Libby model of premixed turbulent combustion supplemented with a model for the mean rate of creation of product is used to analyze the influence of gravity on horizontal premixed turbulent flames propagating either upward or downward into reactants. A parameter determining the extent of the influence of gravity involving various aerothermochemical quantities is identified. Earlier studies of gravity free flames are extended to include a prediction of turbulent flame speed including the influence of gravity by adoption of the KPP-condition of a minimum speed. A linearized treatment of the effect of gravity on the structure of premixed turbulent flames is carried out.

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