Total radiative heat loss and radiation distribution of liquid pool fire flames

• Published in: Fire safety journal Vol. 89; pp. 16 - 21
• Main Authors: Zhou, Liang, Zeng, Dong, Li, Dongyang, Chaos, Marcos
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier Ltd 01.04.2017; Elsevier BV
• Subjects: Alcohols; Alkanes; Burning; Diffusion; Diffusion flames; Electric power distribution; Emission measurements; Fires; Fuels; Heat loss; Liquid fuels; Multiple-point source radiation model; Pool fire; Pool fires; Position measurement; Radiation; Radiation distribution; Radiation fraction; Radiative power distribution; Radiometers; Sensitivity; Multiple-point source radiation model; Radiative power distribution; Radiation fraction; Pool fire
• ISSN: 0379-7112; 1873-7226
• DOI: 10.1016/j.firesaf.2017.02.004

The radiative characteristics of laboratory-scale pool fire flames have been studied in detail. Experiments were conducted in the ASTM E2058/ISO 12136 Fire Propagation Apparatus (FPA). Eleven liquid fuels with different sooting propensities, including alcohols and alkanes, burning in a 9.5cm diameter quartz dish were considered. Radiative power distribution (along the flame axis) and global radiant emission were measured for all the fuels by using slit and wide-view-angle radiometers, respectively. The effects of measurement location and fuel type on the measured data were investigated. Radiation distribution profiles for a given fuel, when adequately normalized, show little sensitivity to the horizontal separation distance of the slit radiometer. Fuels with similar chemical structures exhibit similar distributions, consistent with flame image analyses. The radiative power distributions along with the wide-view-angle radiometer data were used to derive radiant fractions for the pool fires studied by applying a multiple-point source (MPS) radiation model. To examine the sensitivity of the calculated radiant fractions to the measurement location, the position of the wide-view-angle radiometer was considerably varied both vertically and horizontally. The results show that the radiant fractions derived based on the measured radiative power distribution are independent of the location of the wide-view-angle radiometer and consistent with literature values. Therefore, the approach developed in this study presents a flexible methodology apt for the accurate determination of radiation properties of diffusion flames in a laboratory setting. •A slit radiometer methodology was implemented to measure the radiation emission profiles along the flame height for pool fires of 11 different liquids.•A multiple-point source (MPS) radiation model was applied to interpret the radiant fraction of these liquid fuels. The MPS model was extended from jet flames to buoyant turbulent flames.•The combination of measured radiant profile and the multiple-point model provides flexibility of measuring radiant fraction in the near field.