복사열 조건에 따른 플라스틱 가연물의 연기입자와 광소멸 특성에 대한 실험적 연구

Abstract

Smoke generated during a fire reduces the visibility of evacuees and delays evacuation. The mechanism of light interaction changes depending on the size of smoke particles, which significantly affects light extinction. Therefore, analyzing the relationship between dynamic changes in particle size distribution and optical extinction during fires is essential for ensuring evacuation safety. In this study, the optical transmittance of particles by size was measured to identify trends, and the characteristics of smoke particles and specific optical densities under fire conditions were analyzed. The results showed that the optical transmittance decreased as the size of polystyrene particles increased. Combustion experiments under various heat flux conditions (20, 30, 40 kW/m²) and fuel types (PC, PMMA, PVC) revealed time-dependent growth and distribution changes in particles. When particle diameters exceeded approximately 450 nm, their contribution to optical extinction showed signs of overestimation, highlighting the limitations of simple size-based interpretations.