TY - JOUR
TI - Estimation of combustion efficiency for ceiling vented compartment fires using zone model concept
AU - Yuan Man
AU - Zhang Jiaqing
AU - Lu Shouxiang
JN - Thermal Science
PY - 2019
VL - 23
IS - 2
SP - 929
EP - 939
PT - Article
AB - 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.