抄録
Combustion with highly preheated and low oxygen concentration air is utilized for development of high performance industrial furnace. And this combustion have been researched by various method. This paper describes visualized analysis of the flame properties in the furnace which can generate highly preheated and low oxygen concentration air. By a high speed UV video camera and a CCD camera, we measured the spatial distributions of emissions from radical species in the flame under three conditions which were different in terms of preheated temperature and oxygen concentration, and calculated the spatial distributions of fluctuation and vibrational temperature. Flame fluctuation was calculated by Fourier transform, and vibrational temperature was calculated from emission intensity distributions, based on the Boltzmann distribution low. In addition, temperature distributions in the furnace were also measured by thermocouples. As a result, it is indicated that preheating air can stabilize the flame and diluting oxygen concentration can uniform the flame temperature.
