The interaction of multiple fires may lead to a higher flame height and more intense radiation flux than a single fire,which increases the possibility of flame spread and risks to the *** were conducted using three bu...
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The interaction of multiple fires may lead to a higher flame height and more intense radiation flux than a single fire,which increases the possibility of flame spread and risks to the *** were conducted using three burners with identical heat release rates(HRRs)and propane as the fuel at various *** results show that flames change from non-merging to merging as the spacing decreases,which result in a complex evolution of flame height and merging point *** facilitate the analysis,a novel merging criterion based on the dimensionless spacing S/z_(c) was *** non-merging flames(S/z_(c)>0.368),the flame height is almost identical to a single fire;for merging flames(S/z_(c)≤0.368),based on the relationship between thermal buoyancy B and thrust P(the pressure difference between the inside and outside of the flame),a quantitative analysis of the flame height,merging point height,and air entrainment was formed,and the calculated merging flame heights show a good agreement with the measured experimental ***,the multi-point source model was further improved,and radiation fraction of propane was *** data obtained in this study would play an important role in calculating the external radiation of propane fire.
This paper presents an experimental study on flame radiant heat fluxes from two identical pool fires in still air. The pool side length and spacing were changed. The fuel mass loss, flame height and radiative heat flu...
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This paper presents an experimental study on flame radiant heat fluxes from two identical pool fires in still air. The pool side length and spacing were changed. The fuel mass loss, flame height and radiative heat fluxes onto vertical targets far away from the fires were measured. A new method based on the weighted multi-point source model (WMP model) was developed to calculate the thermal radiation by determining the weight of each pointsource using the flame volume fraction. Results showed that both the SPS (single pointsource) and WMP models can well predict the radiative heat fluxes when the targets are located in the middle of two pools. For targets shifting from the centers of two pools, the SPS model will overestimate the radiative heat fluxes, while the accuracy of WMP model is much better. For the typical storage tank with 20 cm diameter, it is estimated that the heat flux received by the target located 30 m away from the edge of storage tank is 20.8 kW/m(2) using the proposed WMP model. And the acceptable safety distance of people (heat flux at the critical value of 1.4 kW/m(2)) exposed to the same storage tank fire is 166 m. (C) 2019 Elsevier Ltd. All rights reserved.
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