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http://dx.doi.org/10.7731/KIFSE.2012.26.2.075

Effects of Change in Heat Release Rate on Unsteady Fire Characteristics in a Semi-Closed Compartment  

Hwang, Cheol-Hong (대전대학교 소방방재학과)
Publication Information
Fire Science and Engineering / v.26, no.2, 2012 , pp. 75-83 More about this Journal
Abstract
An experimental study was conducted to investigate the effects of change in heat release rate on unsteady fire characteristics of under-ventilated fire in a semi-closed compartment. A standard doorway width of the full-scale ISO 9705 room was modified to 0.1 m and the flow rate of heptane fuel was increased linearly with time using a spray nozzle located at the center of enclosure. Temperature, heat flux, species concentrations and heat release rate were continuously measured and then global equivalence ratio (GER) concept was adopted to represent the unsteady thermal and chemical characteristics inside the compartment. It was observed that there was a significant difference in unsteady behavior between global and local combustion efficiency, and the GERs predicted by ideal and measured heat release rate were also shown different results in time. The unsteady behaviors of temperature, heat flux and species concentrations were represented well using the GER concept. It was important to note that CO concentration was gradually decreased with the increase in GER after reaching its maximum value in the range of 2.0~3.0 of global equivalence ratio. In addition, the experimental data on unsteady thermal and chemical behaviors obtained in a semi-closed compartment will be usefully used to validate a realistic fire simulation.
Keywords
Compartment fire; Unsteady fire characteristics; Under-ventilated fire; Semi-closed compartment;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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