PROPERTIES OF EXTERNAL FLAME TAKING INTO CONSIDERATION EXCESS FUEL GAS EJECTED FROM FIRE COMPARTMENT

Abstract

The purpose of this study is to investigate the properties of external flames taking into consideration the combustion of excess fuel gas ejected from fire compartment by conducting a small-scale fire test. The results of this study are as follows : a) The values obtained by dividing the critical heat release rate Q_<vcrit> of external flame by ventilation factor AH^<1/2> and temperature factor A_T/AH^<1/2> correlate to each other and the relationship between Q_<vcrit>/AH^<1/2> and A_T/AH^<1/2> roughly plot linearly. b) Dimensionless values obtained by dividing the height of the average flame tip measured along the central axis of external flame by the representative length of the opening are approximately proportional to the two-third power of the dimensionless heat release rate. c) A correction value Δz calculated from the dimensionless heat release rate, which is calculated from the total rate of heat release of flame ejected from an opening, can be used to predict the temperature of external flame at its central axis, taking into consideration the heat release rate due to the combustion of excess fuel gas.