Upstream Islands of Flame in Lifted-Jets Partially Premixed Combustion; Journal article

摘要

Contemporary interest exists in understanding the roles of leading edge flow deflection, secondary jet instabilities and islands of ignited gases in permitting lifted flames to stabilize. To assess these issues, elements of the leading-edge of a lifted turbulent jet flame have been investigated using laser-imaging techniques. Images of flame position, morphology and dynamics are presented primarily from CH planar laser-induced fluorescence (CH-PLIF) measurements. In particular, evidence of flame islands, or flame fragments, upstream of the bulkflame leading edge are reported and discussed. This evidence is presented in the form of sequential CH-PLIF images and well as CH- PLIF=Rayleigh scattering images. Images showing thermal characteristics of the regions surrounding the edge flame are also described.