Microgravity combustion of methanol and methanol/water droplets: Drop tower experiments and model predictions

Marchese, Anthony J.; Dryer, Frederick L.; Colantonio, Renato O.; Nayagam, Vedha

doi:10.1016/s0082-0784(96)80337-7

Cited by 36 publications

(14 citation statements)

References 12 publications

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“…The point of the time of the steepest ascent of the temperature and the OH-profile nearly coincide. This determination of the ignition point and the location of the flame front agrees with the work of Marchese et al [16]. Furthermore, this determination of the ignition delay time is comparable to ignition delay times determined by the temperature profile, because the inflection points of the temporal profiles almost coincide.…”

Section: Ignition Delay Timessupporting

confidence: 90%

“…Many experimental investigations focus on the combustion of single fuel droplets under microgravity conditions [13][14][15][16][17][18][19][20][21]. Detailed investigations including numerical simulations, allowing detailed insight into the combustion process, have been reported for the fuels methanol [22][23][24][25], ethanol [26], and n-heptane [27][28][29][30] in air.…”

Section: Introductionmentioning

confidence: 99%

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Detailed numerical simulations of the autoignition of single n-heptane droplets in air

Stauch

Lipp

Maas

2006

Combustion and Flame

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Section: Ignition Delay Timessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Detailed numerical simulations of the autoignition of single n-heptane droplets in air

Stauch

Lipp

Maas

2006

Combustion and Flame

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“…These calculations embody full multi-component diffusive transport utilizing the same approach as that employed in the premixed flame calculations reported here. In addition, detailed liquid transport [68], chemiluminescent flame emission [69], and spectral radiative transport effects [71] have been investigated using methanol droplet combustion. Transient droplet burning rate, flame stand-off, and droplet burning extinction phenomena compare favorably with microgravity experiments performed using unsupported droplets [71] in ground-based droptower facilities and with fiber supported droplet experiments performed in a glovebox experiment aboard the Space Shuttle [72].…”

Section: Sensitivity Analysismentioning

confidence: 99%

A comprehensive mechanism for methanol oxidation

Held

Dryer

1998

Int. J. Chem. Kinet.

177

172

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A comprehensive detailed chemical kinetic mechanism for methanol oxidation has been developed and validated against multiple experimental data sets. The data are from static-reactor, flow-reactor, shock-tube, and laminar-flame experiments, and cover conditions of temperature from pressure from and equivalence ratio from 0.05-633-2050 K, 0.26-20 atm, 2.6. Methanol oxidation is found to be highly sensitive to the kinetics of the hydroperoxyl radical through a chain-branching reaction sequence involving hydrogen peroxide at low temperatures, and a chain-terminating path at high temperatures. The sensitivity persists at unusually high temperatures due to the fast reaction of comparedThe branching ratio ofwas found to be a more important parameter under the higher temperature conditions, H O 2 due to the rate-controlling nature of the branching reaction of the H-atom formed through CH 3 O thermal decomposition.

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“…Soot in the droplet flame is one of reasons for nonlinear burning of droplets. Most of droplet combustion models have not included soot and its effects and some experimental studies have been conducted using non sooting fuel [10][11][12] , controlled O 2 concentration 13) and inert substitution to mitigate the sooting effect [14][15][16] . The burning rate of the n-heptane droplet is affected by the accumulation of the soot shell 8) and the soot production increases with initial droplet diameter.…”

Section: Introductionmentioning

confidence: 99%

Effects of Carbon Dioxide on Unsteady Combustion of Isolated Fuel Droplet in Microgravity

Nakaya

Nagashima

Takase

et al. 2010

AEROSPACE TECHNOLOGY JAPAN

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An experimental study on the unsteady combustion of the n-decane droplet in microgravity was performed.Experimental observations were performed in a drop tower to create a microgravity condition. The initial droplet diameter was varied and the unsteady behavior of the burning rate was investigated. The effect of CO 2 in the ambience on the burning rate and soot formation was also investigated. The results indicated the staged behavior of the burning rate for n-decane droplet combustion in air, and it might be due to the soot shell agglomeration and collapse. The staged behavior was not observed when the initial droplet diameter was small. The intensity of the luminous flame of n-decane droplets became weak with increase in CO 2 concentration and the mitigation effect was greater as the initial droplet diameter decreases. The staged behavior of the burning rate was not observed when the concentration of CO 2 in the ambience increased and the burning rate gradually increased with time. The unsteady behavior of the burning rate for n-decane droplet was apparently observed.

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Microgravity combustion of methanol and methanol/water droplets: Drop tower experiments and model predictions

Cited by 36 publications

References 12 publications

Detailed numerical simulations of the autoignition of single n-heptane droplets in air

Detailed numerical simulations of the autoignition of single n-heptane droplets in air

A comprehensive mechanism for methanol oxidation

Effects of Carbon Dioxide on Unsteady Combustion of Isolated Fuel Droplet in Microgravity

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