Fire Behavior under a Ceiling in Growing Fire Part 2 Ceiling Jet Velocity and Flame Length

Abstract

Heat transfer to structural members is a principal factor in a building fire. Various theoretical and experimental studies have been undertaken with respect to the flame and flame length in order to estimate the heat input. The properties of a flame that grows in the vertical direction have been revealed by many researchers that commonly use fire steadily ignited by a burner; however, there is little research that considers a flame spreading horizontally to a ceiling as a result of a growing fire.[2] In a steadily burning fire that heats the ceiling until the flame length becomes stable, it can be expected that the accumulated heat on the ceiling influences the flame length. Therefore, in this experiment, the flame height with respect to the developing fire was investigated by using a wood crib that replicates a growing fire in the actual fire. The relation of the burning rate and the flame length with respect to a temporally developing fire can be obtained by measuring the flame length with a time-variable scale of the fire.