Accession Number : ADP008995

Title :   Determination of Burning Velocities of Curved Flame Fronts,

Corporate Author : DEUTSCHE FORSCHUNGS- UND VERSUCHSANSTALT FUER LUFT- UND RAUMFAHRT E V GOETTING EN (GERMANY F R)

Personal Author(s) : Eberius, H. ; Just, T. ; Koch, U.

Report Date : 23 JUL 1992

Pagination or Media Count : 4

Abstract : The accurate experimental determination of burning velocities is a severe problem. Because of experimental difficulties there is no generally recommended procedure for velocity measurements of planar flames. Even greater are the difficulties for determining the burning velocity of curved flames, resulting in a rather complete lack of such data. The velocity of weekly curved flame fronts was investigated at the flame tip in Bunsen burner flowfields of methane/air mixtures. The local velocity of the gases was measured with high accuracy using laser Doppler anemometry, whereas the position of the flamefront was recorded with a video camera. The video signals were digitized and evaluated with an image processing system. Burning velocities could be derived from these data, and the results show the strong influence of flame sheet curvature on local flame velocity. For moderate curvatures in the functional relationship could be represented by a linear function of the reciprocal radius of curvature. (Author)

Descriptors :   *FLAME PROPAGATION, *LASER ANEMOMETERS, *FLOW VISUALIZATION, BURNERS, FLOW FIELDS, IMAGE PROCESSING, GERMANY.

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE