Pressure modeling of upward flame spread and burning rates over solids in partial gravity

Kleinhenz, J.; Feier, Ioan I.; Hsu, Sheng-Yen; T’ien, James S.; Ferkul, Paul V.; Sacksteder, Kurt R.

doi:10.1016/j.combustflame.2008.05.023

Cited by 51 publications

(19 citation statements)

References 10 publications

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“…This is because that in Hefei, the pressure is much higher than Lhasa. According to Kleinhenz et al, 17 the flame spread speed v f }P 2 g. This agrees with our experimental results. …”

Section: Resultssupporting

confidence: 94%

Experimental study on fire risk of buildings’ U-shaped exterior wall on flame propagation of insulation material on plain and plateau

Yan

Shen²,

et al. 2015

Journal of Fire Sciences

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This study provides an understanding of the fire risk of building's exterior wall geometry design at different altitudes. The influences of the U-shaped exterior wall geometry on upward flame spread over insulation material on plain and plateau were studied through laboratory-scale experiments. A hypothesis of pseudo chimney effect is provided. Results show that in both plain and plateau, the flame spread rate and the mass loss rate increase as the U-shaped geometry becomes deeper. The time for flame to propagate a certain distance follows an exponential decreasing trend, while it could be concluded that the upper and lower boundaries indicate the time for that of flat and enclosure geometry, respectively. Moreover, the flame spread rate is much higher in plain than in plateau. The key parameter is the upward flow induced by the air entrainment from bottom and front sides of the geometry which enhances the heat feedback.

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“…This is because that in Hefei, the pressure is much higher than Lhasa. According to Kleinhenz et al, 17 the flame spread speed v f }P 2 g. This agrees with our experimental results. …”

Section: Resultssupporting

confidence: 94%

Experimental study on fire risk of buildings’ U-shaped exterior wall on flame propagation of insulation material on plain and plateau

Yan

Shen²,

et al. 2015

Journal of Fire Sciences

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“…The atmospheric flame is yellow whereas the low pressure flame is blue. The shape and color of the flame at low pressure are similar to those observed in microgravity tests [24,25], which is understandable since reducing the ambient pressure reduces buoyancy [26].…”

Section: Resultssupporting

confidence: 55%

The combined effect of pressure and oxygen concentration on piloted ignition of a solid combustible

McAllister

Fernandez-Pello

Urban

et al. 2010

Combustion and Flame

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“…At present, most low‐pressure fire studies compare the combustion characteristics of the same fuel at different altitudes . The experiments were primarily done in Lhasa (altitude, 3650 m; pressure, P = 64.3 kPa) and Hefei (altitude, 50 m; P = 101 kPa), and a small number of fire tests were performed at three to four altitudes and in a low‐pressure chamber . The fire test fuel was classified into gaseous, liquid, and solid fuel, and similar conclusions have been reached: In higher‐altitude areas, the flame height, flame volume, ignition temperature, and ignition time increase, but the burning rate and flame pulsation decrease.…”

Section: Introductionmentioning

confidence: 85%

“…In the other method, which was to directly modify the environmental pressure parameters by software, the low pressure was usually accompanied by gravity changes, and there may be an error in the simulation. Based on the classical pressure model, the pressure‐gravity model was proposed by Kleinhenz et al On the basis of m max / D = f ( Gr ), P 2 g was kept constant, and different pressure level conditions were selected for the combustion simulation. The burning rate of combustibles was proportional to the characteristic length L. The ignition experiments of eight groups of polymethylmethacrylate (PMMA) in different low‐pressure environments were simulated by McAllister et al using Fluent.…”

Section: Introductionmentioning

confidence: 99%

A new approach based on the modified FDS to numerically simulate cardboard box combustion under low pressure

Zhou

Zhao

et al. 2019

Fire and Materials

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Summary To solve the limitation of the fire test in high‐altitude areas only detecting a limited number of low‐pressure environments, in this paper, appropriate modifications of the FDS source codes were made to generate a new simulator program for low‐pressure applications. Standard fire experiments with different counts (1, 2, 18, and 27) of cardboard boxes were numerically simulated under different pressure levels (101, 90, 75, and 64 kPa). The computation data show consistent trends with the experimental results obtained in the low‐pressure tank at Lang Fang. Furthermore, the simulation results have been examined to show typical quantitative relationships: (a) The peak mass burning rate divided by the fire base dimension is correlated with the product of the pressure squared and the combustible characteristic length cubed. The exponential indices for the 1‐box fire, 18‐box fire, and 27‐box fire are 0.31, 0.29, and 0.29, respectively. (b) The heat release rate and mass burning rate show a good linearity at each fixed environmental pressure. In conclusion, the modified FDS is validated to work well under low‐pressure conditions, which can provide a receivable means to conduct low‐pressure fire simulation and analysis.

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Pressure modeling of upward flame spread and burning rates over solids in partial gravity

Cited by 51 publications

References 10 publications

Experimental study on fire risk of buildings’ U-shaped exterior wall on flame propagation of insulation material on plain and plateau

Experimental study on fire risk of buildings’ U-shaped exterior wall on flame propagation of insulation material on plain and plateau

The combined effect of pressure and oxygen concentration on piloted ignition of a solid combustible

A new approach based on the modified FDS to numerically simulate cardboard box combustion under low pressure

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