Temperature and OH concentration measurements in alcohol–air flame using laser-induced fluorescence

Temperatures and OH concentrations in ethanol flames were measured using laser-induced fluorescence and probe methods. The maximum temperatures recorded by different methods agree with each other. During combustion of ethanol evaporating from the surface of a sphere 15 mm in diameter, the radical concentration was $\approx$ 7 $\cdot$ 10$^{16}$ cm$^{-3}$ taking into account fluorescence extinction. In concentration measurements, the equipment was calibrated in experiments with a hydrogen flame, for which these data are known. It has been established that in both cases, the maximum of the OH concentration is displaced with respect to the temperature maximum. The data obtained can be useful in studying the combustion of liquid fuel drops.