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Estimation of combustion efficiency for ceiling vented compartment fires using zone model concept

Combustion efficiency is difficult to measure or estimate for ceiling vented compartment fires because of the comprehensive interaction between vent flows and burning environment. Special phenomenons suggesting very poor burnings were observed in such limited ceiling vented compartment fires, like ghosting flames and oscillating flames. An estimation method for the combustion efficiencies of pool fires, which was important to characterize the incompleteness of the combustion, was established in the scope of zone models, and was validated using a sealed compartment fire case. In this method, oxygen concentrations, fuel mass loss rates can be also predicted based on temperature predictions. Small scale ceiling vented compartment pool fires were studied using this method. Temperature distributions, fuel mass loss rates and oxygen concentrations were compared in order to partially validate the mathematical model. The ventilation conditions of the poor fire were considered and quantified by introducing equivalence ratio. The present study may provide a practical way to understand the incomplete burning of such ceiling vented compartment fires.
PAPER REVISED: 2017-07-17
PAPER ACCEPTED: 2017-08-11
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