Abstract
Simultaneous measurement of OH and CH radicals by planar laser induced fluorescence (PLIF) is conducted for laminar premixed flames and lean premixed cellular flames. Effectiveness of CH PLIF as an indicator of the heat release rate is shown by comparing the results of CH PLIF experiments with numerical simulations. In laminar flames, the change of CH mole fraction with the equivalence ratio can be represented by CH PLIF. In addition, even in lean cellular flames, in which CH mole fraction is significantly low, CH fluorescence can be measured. These results imply that CH PLIF can be applicable to estimate spatial variation of the heat release rate in the turbulent premixed flames.
