Abstract
This report presents experimental results for temperature and concentration profiles across laminar premixed flames. The data were obtained by using non-intrusive laser-induced fluorescence. In a first part, concentrationprofiles of OH, CH, and NO are shown for a variety of stationary, laminar and premixed plane flames of propane-air for different stoichiometries. The results can be compared with those for similar flames of propane-oxygen-carbondioxide-mixtures. In order to increase the spatial resolution of the measurements the thin flame front was highly stretched by decreasing the pressure to 30mbar. The new results extend the existing database of intermediates in low-pressure flames. The second part focusses on the nonlinear interactions within laminar premixed flames, which lead in the present application to a thermal-diffusive instability. As an example the methane-air flame at atmospheric pressure is considered. The stability limits are shown at which a bifurcation occurs that changes the plane flame front into regular, cellular patterns. The spatial structures are visualized by horizontal and vertical light sheets using laser-induced fluorescence. The evaluation of experimental results allows a determination of two-dimensional temperature distributions. It is found that the size of the cells is correlated with the gas velocity, while their amplitude is related to the stoichiometry.
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