Analysis of flame structure by isotope shift-planar laser induced fluorescence spectrometry of trace OH and OD Radicals

► Method of IS/PLIF has been used to analyze the combustion reaction and flow mixing. ► The spatial distributions of fluorescent emissions from OH and OD radicals to examine mixing under real combustion flows. ► The planar laser-induced fluorescence (PLIF) measurement of the radical species, OH and OD during combustion.