Extinguishment of methane diffusion flames by carbon dioxide in coflow air and oxygen-enriched microgravity environments

Takahashi, Fumiaki; Linteris, Gregory T.; Katta, Viswanath R.

doi:10.1016/j.combustflame.2008.03.005

Cited by 24 publications

(12 citation statements)

References 26 publications

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“…CO2 dilution effects 6 have been the subject of various investigations where it has been used as a diluent injected into an 7 oxidiser stream, as air-stream dilution (ASD), as in references [7][8][9][10][11][12][13]. Similarly, CO2 may be 8 injected into the fuel stream as a diluent (fuel-stream dilution) as reported by several researchers.…”

mentioning

confidence: 99%

Effect of CO2 dilution on the structure and emissions from turbulent, non-premixed methane–air jet flames

Erete

Hughes

et al. 2017

Journal of the Energy Institute

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mentioning

confidence: 99%

Effect of CO2 dilution on the structure and emissions from turbulent, non-premixed methane–air jet flames

Erete

Hughes

et al. 2017

Journal of the Energy Institute

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“…(3d) includes that conducted into the particle and especially the re-radiation losses from the surface, which are very important for large solid particles (>5 mm here) compared to the small droplets (less than 1 mm) usually investigated in the literature [1][2][3][4][5][6][7][8][9][10][11]. Based on Eqs.…”

Section: Luminancementioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10]), gases (e.g. [11][12][13]) and even solid combustibles [14][15][16][17][18][19][20]. The burning behavior of fuel droplets in microgravity has been investigated extensively for example by Wang [1], Okai [2], Yang [3], Shaw [4,5] and Manzello [6,7] for free fuel droplets or near a wall.…”

Section: Introductionmentioning

confidence: 99%

“…Yozgatligil [8] has revealed the sooting behavior of ethanol droplet combustion under micro-gravity conditions through the 2.2-s drop tower at NASA Glenn Research Center. Ogami [10] and Takahashi [11] have investigated the droplet combustion and flame extinguishment behavior under different flow conditions. For solid combustible, Yang [14] has carried out experiments in NASA DC-9 and the KC-135 Reduced Gravity Aircraft to investigate the burning behavior of thermoplastic spheres.…”

Section: Introductionmentioning

confidence: 99%

“…Combustion behavior and flame characteristics under microgravity conditions have attracted extensive research interest [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Under micro-gravity conditions, the buoyancy force owing to gravitational acceleration disappears.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on diffusive solid combustion behavior during transition from normal- to reduced-gravity

Delichatsios

et al. 2012

International Journal of Heat and Mass Transfer

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a b s t r a c tExperiments are carried out in a simplified drop system, which can provide a 2.3 s 10 À2 g reduced gravity period, to investigate the transition of solid material combustion behavior from normal-to reduced-gravity. A CCD camera records the diffusion flames produced by a solid fuel, Methenamine (C 6 H 12 N 4 ), which easily sublimes and decomposes to flammable CH 4 and H 2 . The temperature distribution within the flame is analyzed by a monochromatic line of sight CCD measurement calibrated by a thermocouple measurement. It is revealed that during the transition period from normal-to reduced-gravity, the change of the flame shape, from tall and thin (pear like) to spherical, is faster than that of the luminance which represents the radiation intensity, indicating a relatively shorter adjustment time scale of dynamical gas flow buoyancy than that of the heat transfer when subjected to such a sudden change of gravity condition. It is also found that owing to the change of the flow affecting the oxygen and heat supply, the luminance of the flame as well as the burning rate, which was deduced based on projected area of the solid fuel according to d 2 -law, first decreases followed by an increment near the end of the drop where the gravity level slightly increases. The flame temperature gradually decreases, as the flame suddenly goes into reduced-gravity. Interpretation based on analysis of heat transfer balance and pyrolysis rate as well as the experimental results both indicate that the transitional effect is less pronounced for a smaller fuel particle than for a larger one, where buoyancy is stronger under normal-gravity whereas the flame has a larger standoff distance with increasing importance of the radiation losses from the fuel particle surface under reduced-gravity. The present work is relevant in assessing fire hazards of solid material during space travel as gravity levels change.

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Section B Fire and Explosion - Observation of Confined Deflagration Phenomena of Flammable Gas Mixtures Under Elevated Gravity

Saitoh

Mizutani

Kurihara

et al. 2014

Progress in Scale Modeling, Volume II

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Extinguishment of methane diffusion flames by carbon dioxide in coflow air and oxygen-enriched microgravity environments

Cited by 24 publications

References 26 publications

Effect of CO2 dilution on the structure and emissions from turbulent, non-premixed methane–air jet flames

Effect of CO2 dilution on the structure and emissions from turbulent, non-premixed methane–air jet flames

Experimental study on diffusive solid combustion behavior during transition from normal- to reduced-gravity

Section B Fire and Explosion - Observation of Confined Deflagration Phenomena of Flammable Gas Mixtures Under Elevated Gravity

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