Experimental Study on Luminous Flame

Abstract

In the experimental furnace of comparatively large scale, the radiant heat transfer from the flame and the soot formation in the flames of the liquid fuel and gaseous fuel are studied. In the luminous flame of the liquid fuel, the soot concentrations and the size distributions of soot particles differ considerably by the burning methods, and particles larger than 10μ are often found. Even in the luminous flame of the gaseous fuel, the large particles are also found and the size distributions are different from the previously accepted knowledge obtained in very small gas flames. The chemical compositions of soot particles of each flame also vary at the various positions. The radiation from the cloud of soot particles is affected remarkably by the size distribution of the soot particles and a little by the chemical composition. The relation by which the emissivity of the luminous flame can be estimated is obtained.