Scattering Intensity of Floor Illuminance and Surface Luminance of Smoldering Smoke Layer

Abstract

This paper examines the relationship between smoke layer properties and luminous quantities such as floor illuminance and surface luminance of smoke layer by conducting photometrical experiments under a smoke layer configuration with white smoke from smoldering fire source. The floor illuminance and surface luminance on the smoke layer in the model test compartment are found to be dependent upon the size of light source, the distance between light source and the observed location, the smoke layer thickness ZCs and optical smoke density Cs. The scattering intensity of white smoke from smoldering fire increases as the Cs and ZCs increased and the extent of the increase is affected by size of light source and measurement points of floor illuminance. The surface luminance of the smoke layer has a distribution and the luminance at the light source center decreases with the increase of CsZCs, while the surface luminance to the ceiling increased with CsZCs.