Heat feedback to the fuel surface of a pool fire in an enclosure

Nasr, Anouar; Suard, Sylvain; El-Rabii, Hazem; Garo, Jean-Pierre; Rigollet, L.

doi:10.1016/j.firesaf.2012.12.005

Cited by 31 publications

(13 citation statements)

References 17 publications

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“…Nasr et al . [28] found that the thermal radiation received by the fuel can be subdivided into the flame radiation and the external radiation in an enclosure and they developed an original method to calculate the two compo- nents. Ji et al .…”

Section: Introductionmentioning

confidence: 99%

Experimental study on flame merging behaviors from two pool fires along the longitudinal centerline of model tunnel with natural ventilation

Wan

Gao

et al. 2016

Combustion and Flame

102

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Section: Introductionmentioning

confidence: 99%

Experimental study on flame merging behaviors from two pool fires along the longitudinal centerline of model tunnel with natural ventilation

Wan

Gao

et al. 2016

Combustion and Flame

102

View full text Add to dashboard Cite

“…The tilt angle changes with different flame positions, which causes the thermal feedback from fire to pool to also be different. 26 Accurately, expressing the coupling relation between these factors can provide a basis for the study of the surface evaporation, ignition, and flame propagation in the pool. However, the above Formulas 1 to 9 cannot accurately reflect the relationship between the flame tilt angle and the fire position.…”

Section: Discussionmentioning

confidence: 99%

“…It can be observed from Figure that the tilt angle is related to the position of the flame. The tilt angle changes with different flame positions, which causes the thermal feedback from fire to pool to also be different . Accurately, expressing the coupling relation between these factors can provide a basis for the study of the surface evaporation, ignition, and flame propagation in the pool.…”

Section: Introductionmentioning

confidence: 99%

The effects of transient heat release rate and crosswind on flame length and tilt angle of flames at different positions in the spread of fire over a diesel pool

Wang

Dong

et al. 2018

Fire and Materials

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Summary The spread of fire over liquid fuel is a common phenomenon, and it has been demonstrated experimentally that the flame length and tilt angle change with the transient heat release rate and different positions of the flame. The coupling relationship between these factors is studied in this paper. The experiments are composed of a rectangular pool with dimensions of 80 cm × 6 cm × 5 cm and crosswind with speeds of 0.8 to 2.4 m/s. Diesel is used as the fuel, and a new method is applied to ensure that the initial temperature of the diesel is constant during ignition. The results show that the traditional method of luminous flame intermittency may not be suitable for studying the geometric characteristics of the spread of fire over a pool, and a new method is proposed. In addition, the transient variation of flame length in different positions of the pool is shown to fluctuate around a mean flame length. The evolution of flame tilt angle along the longitudinal direction of the pool exhibits a U‐shaped curve. Moreover, the multivariate nonlinear relationships of mean flame length and tilt angle among the heat release rate, fire position, and wind speed are established, and relevant coefficients are determined.

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“…The effect of heat permeability of enclosure has an importance on the fire behavior, notably on the thermal stratification of unburnt fuel gases [22]. The more heat-tight is a compartment, the more heat feedback is received to the surface of burning liquid fuel [23]. The re-ignition related risks may become more significant when the enclosure is more heat-tight due to a large formation of unburnt fuel.…”

Section: Introductionmentioning

confidence: 99%

Influence of heat tightness of an enclosure fire on ignition risk of unburnt gases in a connected exhaust system – An experimental study

Manescau

Wang

Coudour

et al. 2019

Fire Safety Journal

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An experimental study was performed from a reduced scale enclosure with a length/height and width of 2 m. A dodecane pan of 40 cm in diameter is placed at the center of the enclosure floor. An external ventilation system provides an air supply rate with an Air Change Per Hour (ACPH) ranging from 3 to 5. Influence of the intermediate levels of thermal insulation of enclosure on ignition risk in a connected exhaust system is experimentally evaluated. The results show that thermal insulation of an enclosure leads to faster fire growth, implying more important peak in heat release rate, and thus more dangerous fire in regards to the ignition risk. Heat tightness of enclosure enhances the mass loss rate of liquid fuel, but reduces the air supply rate from the admission duct due to decrease of the depression level in the compartment. As a consequence, the fire becomes quickly very-under-ventilated, and a large vaporized fuel is converted into the unburnt gases such as hydrocarbons, CO and H2. In the early stages of a fire, a hotter unburnt fuel layer with a concentration above the Lower Flammability Limit (LFL) is formed in the extraction duct connected to a mechanically ventilated enclosure fire. With a long time delay in a range of 16 to 21 min in the current study, the energy released per mass of oxygen consumed allows to raise the smoke temperature above 350°C. Occurrence of flame extinction in vitiated air enclosure makes a sudden increase of the depression level inside enclosure due to cooling effects. This results in a sudden supply of fresh air from dilution duct, providing a sufficient amount of oxygen to trigger ignition of a fuel rich mixture near the extraction duct. It is found that ignition of unburnt volatiles at entrance of the extraction duct occurs more easily when the compartment is more heat-tight with a reduction by about 30% in the ignition delay.

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Heat feedback to the fuel surface of a pool fire in an enclosure

Cited by 31 publications

References 17 publications

Experimental study on flame merging behaviors from two pool fires along the longitudinal centerline of model tunnel with natural ventilation

Experimental study on flame merging behaviors from two pool fires along the longitudinal centerline of model tunnel with natural ventilation

The effects of transient heat release rate and crosswind on flame length and tilt angle of flames at different positions in the spread of fire over a diesel pool

Influence of heat tightness of an enclosure fire on ignition risk of unburnt gases in a connected exhaust system – An experimental study

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