Laser-induced fluorescence study of OH in flat flames of 1-10 bar compared with resonance CARS experiments.

ABSTRACT

Laser-induced fluorescence (LIF) measurements of OH were performed in flat stoichiometric CH(4)/air flames burning at 1, 3, 5, 7, and 9.6 bar, which had previously been investigated using OH resonance CARS. In the LIF study, line shape information and temperatures were extracted from excitation spectra; in addition, OH profiles as a function of height above the burner surface and an estimate of the OH concentration for the different flames were obtained. The perspectives and feasibility of quantitative fluorescence measurements in high pressure flames are discussed, particularly in comparison with the application of resonance CARS.