Fire Plume Ejected from an Opening in nconfined Space Part 3 Behavior of Fire Plume Ejected from an Opening in the Vicinity of Opposed Walls

Jo, Akihide; Nakao, Tomoaki; Yanagisawa, Akito; Wakatsuki, Kaoru; Ohmiya, Yoshifumi

doi:10.3210/fst.26.511

Cited by 6 publications

(1 citation statement)

References 2 publications

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“…Such a restriction of side walls on enclosure facade fires mainly focusing on the effects of side walls on temperature distribution has been reported in [18]. Because the presence of side walls does not affect the critical heat release rate (1500A √ H , in kW) [19][20][21][22], the main effect on the facade flame height is presumably due to the restriction of air entrainment from the two sides parallel to the facade wall. This effect of side walls on facade flame entrainment and thus the facade height behavior is investigated in detail in this work.…”

Section: Matec Web Of Conferencesmentioning

confidence: 99%

Effects of side walls on facade flame entrainment and flame height from opening in compartment fires

Tang

et al. 2013

MATEC Web of Conferences

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Abstract. This paper presents an investigation of the side wall effects on facade flames ejected from the opening (such as a window) of an under-ventilated room fire. Experiments are carried out in a reduced-scale experimental setup, consisting of a cubic fire compartment having an opening with a vertical facade wall and two side walls normal to the façade wall. By changing the distance of the two side walls, the facade flame heights for different opening conditions (width, height) are recorded by a CCD camera. It is found that as the distance of the two side walls decreases the behavior the flame height can be distinguished into two regimes characterized by the dimensionless excess heat release rate,Q * ex , outside the opening: (a) for the "wall fire" (Q * ex ≤ 1.3), the flame height is shown to change little with decrease of side wall distance as the dominant entrainment is from the front direction (normal to the facade wall) independent of the side wall distances; (b) for the "axis-symmetrical fire" (Q * ex > 1.3), the flame height increases significantly with a decrease in side wall distance as both the entrainment from the two side directions (parallel to the facade wall) and that from the front direction (normal to the facade wall) together apply. A global physically based non-dimensional factor K is then brought forward based on the side wall constraint effect on the facade flame entrainment to characterize the side wall effect on the flame height, by accounting for the dimensionless excess heat release rate, the characteristic length scales of the opening as well as the side wall separation distance. The experimental data for different opening dimensions and side wall distances collapse by using this global non-dimensional factor.

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Section: Matec Web Of Conferencesmentioning

confidence: 99%

Effects of side walls on facade flame entrainment and flame height from opening in compartment fires

Tang

et al. 2013

MATEC Web of Conferences

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A global non-dimensional factor characterizing side wall constraint effect on facade flame entrainment and flame height from opening of compartment fires

Tang

et al. 2014

International Journal of Heat and Mass Transfer

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Investigation on vertical temperature profile of thermal ejected plume from a compartment fire with an adjacent side wall

Gan¹,

Xu²,

Yang³

et al. 2021

International Journal of Thermal Sciences

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Fire Plume Ejected from an Opening in nconfined Space Part 3 Behavior of Fire Plume Ejected from an Opening in the Vicinity of Opposed Walls

Cited by 6 publications

References 2 publications

Effects of side walls on facade flame entrainment and flame height from opening in compartment fires

Effects of side walls on facade flame entrainment and flame height from opening in compartment fires

A global non-dimensional factor characterizing side wall constraint effect on facade flame entrainment and flame height from opening of compartment fires

Investigation on vertical temperature profile of thermal ejected plume from a compartment fire with an adjacent side wall

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