Radiation Measurements in Kerosene Pool Flames Using High-Speed Thermography

Abstract

Detalls of apparent temperature distributions in large ~c~le kerosene pool flames in a 2.7m square tank were measured by high-speed thermography which stores a thermal image in the form of a thermal TV color image with 25 60O data points every 0.05 seconds. The apparent temperature image can be changed to irradiance by sirnple approximations. The irradiance of the data (2 cases and 140 images) was compared with that of a wide angle thermopile radiometerto verify the data from the thermography A series of data recarded at intervals of 1 and 5 seconds were also analyzed to obtain the radiance distribution in the flame The analysis allows the following conclusions : lrradiance values obtained by high-speed therrno graphy are not very different from those of a conventional wide angle thermopile radiometer. The high radiance zone which ordinary cameras do not shaw was determined by the average vaIL~e of each of 70 apparent temperature images and the center of the high radiance zone is located at about 0.3D (D is the tank diameter) The moderately high apparent temperature range of 1323-1448K apparently has a strong influence on the irradiance of pool flames.