Laminar burning velocities and Markstein lengths of premixed methane/air flames near the lean flammability limit in microgravity

Wang, Shuangfeng; Zhang, Hai; Jarosiński, Józef; Gorczakowski, Andrzej; Podfilipski, Jerzy

doi:10.1016/j.combustflame.2010.01.006

Cited by 22 publications

(29 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Specifically, a variety of experimental data sets for CH 4 /air reported in the literature [13][14][15][16][17][18][19][20][21][22][23][24][25][26] is collected to show the differences in S 0 u measurement using the OPF method. Moreover, effects of mixture preparation [5,9,27,28], ignition [29][30][31][32], buoyancy [33,34], instability [35][36][37], confinement [38][39][40][41], radiation [9,10,[41][42][43][44], nonlinear stretch behavior [22,[45][46][47][48][49], and extrapolation [50,51] on the discrepancies in S 0 u measurement are examined based on 1-D simulation of propagating planar and spherical flames.…”

Section: Introductionmentioning

confidence: 99%

On the accuracy of laminar flame speeds measured from outwardly propagating spherical flames: Methane/air at normal temperature and pressure

Chen

2015

Combustion and Flame

228

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

On the accuracy of laminar flame speeds measured from outwardly propagating spherical flames: Methane/air at normal temperature and pressure

Chen

2015

Combustion and Flame

228

View full text Add to dashboard Cite

“…So far, several techniques for measuring the one-dimensional laminar burning velocity have been used for wide range of temperature, pressure and fuel, and rather accurate measurements have been obtained by employing flat or curved flames in stagnation flow [10], propagating spherical flames in combustion vessel [11,12], flat flames stabilized on burner [13] or conical flames stabilized on a Bunsen burner [14]. With all those measurement techniques proper care could be taken to remove the effect of flame stretch either during experimentation or through further data processing.…”

Section: Introductionmentioning

confidence: 99%

Effect of water mist on temperature and burning velocity of stretched propane-air premixed flames

Yoshida¹,

Momomoto²,

Naito³

et al. 2013

Computational Methods in Multiphase Flow VII

View full text Add to dashboard Cite

Effects of fine water mist on the flame temperature and laminar burning velocity of propane/air premixed flame were investigated by using a single jet-plate configuration. For the case without water mist, the measured laminar burning velocities are in reasonably good agreement with previously reported data and numerical simulation. The dependence of the burning velocity on the stretch rate for the case without water mist is positive for all mixtures tested, resulting in the negative Markstein length, which coincides with previous experimental and theoretical studies. With water mist addition, the laminar burning velocity is lowered significantly and its dependence on the stretch rate is changed to negative. This leads to apparently positive Markstein lengths. Concurrently, the flame temperature decreases linearly with the water mist mass loading. Also, it decreases with the stretch rate, even if the water mist mass loading is kept constant. The positive Markstein length was discussed on the basis of the mist droplets behavior in the stagnation flow field. Even if the mist mass loading is kept constant, the mist droplets do not follow the diverting flow field when the stretch rate is high and the droplets accumulation occurs in the stagnation region where the burning velocities were measured. This fact results in the lower burning velocity and lower flame temperature as compared to those measured for uniformly dispersed water mist.

show abstract

“…[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%

“…Studies on such a transient process are limited. Law [13] and Tien [19] had observed and studied the transient combustion behavior during a change of the gravity level from normal-to reduced-gravity. Gaseous fuel from a porous burner and PMMA, which melts as it burns, were used as the fuel in Law [13] and Tien's [19] experiments respectively.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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.

show abstract

Laminar burning velocities and Markstein lengths of premixed methane/air flames near the lean flammability limit in microgravity

Cited by 22 publications

References 40 publications

On the accuracy of laminar flame speeds measured from outwardly propagating spherical flames: Methane/air at normal temperature and pressure

On the accuracy of laminar flame speeds measured from outwardly propagating spherical flames: Methane/air at normal temperature and pressure

Effect of water mist on temperature and burning velocity of stretched propane-air premixed flames

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

Contact Info

Product

Resources

About