Measured and predicted properties of laminar premixed methane/air flames at various pressures

Hassan, M. I.

doi:10.1016/s0010-2180(98)00025-x

Cited by 232 publications

(90 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As the starting pressure is increased from 3 to 18 bars, a decrease of the laminar burning velocity can be observed; u l0 at 18 bar is about 40% of 3 bar. The comparison is proposed with the results from other research groups [3,4,[7][8][9][10][11]. Data at high pressures are less readily available than atmospheric pressure: the present results for u l0 show a fairly good agreement with most of published data, save for the values of Halter, which appear slightly lower.…”

Section: Laminar Burning Propertiessupporting

confidence: 79%

“…Time-resolved, shadowgraph images of the spherical expanding flame allow to evaluate the laminar burning parameters, according to a well-known approach [2,5,[7][8][9][10]12,15,16]. The time evolution of r u (the flame radius on the unburned gas side) is obtained through frame-by-frame processing, assuming the luminous front in the shadowgraph corresponds to the radius on the unburned gas side [16].…”

Section: Theorymentioning

confidence: 99%

“…engines and gas turbine combustors is the knowledge of laminar combustion properties: they offer the basis for modelling and simulation of flame-turbulence interaction. Data on the combustion properties of pure gaseous fuels are widely available in the literature [1][2][3][4][5][6][7][8][9][10][11][12], but hardly in a systematic form; moreover, data for multi-component fuels at high pressure are even scarcer: filling this gap is the scope of the Device for Hydrogen-Air Reaction Mode Analysis (DHARMA) project, aiming at generating a comprehensive and coherent grid of data on the combustion properties of CH 4 and H 2 , obtained in conditions as close as possible to those of actual engines.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Burning Behaviour of High-Pressure CH4-H2-Air Mixtures

Moccia

D'Alessio

2013

Energies

View full text Add to dashboard Cite

Experimental characterization of the burning behavior of gaseous mixtures has been carried out, analyzing spherical expanding flames. Tests were performed in the Device for Hydrogen-Air Reaction Mode Analysis (DHARMA) laboratory of Istituto Motori-CNR. Based on a high-pressure, constant-volume bomb, the activity is aimed at populating a systematic database on the burning properties of CH 4 , H 2 and other species of interest, in conditions typical of internal combustion (i.c.) engines and gas turbines. High-speed shadowgraph is used to record the flame growth, allowing to infer the laminar burning parameters and the flame stability properties. Mixtures of CH 4 , H 2 and air have been analyzed at initial temperature 293÷305 K, initial pressure 3÷18 bar and equivalence ratio  = 1.0. The amount of H 2 in the mixture was 0%, 20% and 30% (vol.). The effect of the initial pressure and of the Hydrogen content on the laminar burning velocity and the Markstein length has been evaluated: the relative weight and mutual interaction has been assessed of the two controlling parameters. Analysis has been carried out of the flame instability, expressed in terms of the critical radius for the onset of cellularity, as a function of the operating conditions.

show abstract

Section: Laminar Burning Propertiessupporting

confidence: 79%

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Burning Behaviour of High-Pressure CH4-H2-Air Mixtures

Moccia

D'Alessio

2013

Energies

View full text Add to dashboard Cite

show abstract

“…The error bars in the experimental measurements correspond to the envelope of four different measurements performed by different authors. These measurements were realized using counter flow flames [32,33] or spherical flame [34] . The laminar flame velocity from the LU13 scheme is 4% higher than the one from the GRI-3.0 mechanism.…”

Section: Fluid and Solid Solvermentioning

confidence: 99%

Joint experimental and numerical study of the influence of flame holder temperature on the stabilization of a laminar methane flame on a cylinder

Miguel-Brebion

Mejía

Xavier

et al. 2016

Combustion and Flame

View full text Add to dashboard Cite

OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. a b s t r a c tThe mechanisms controlling laminar flame anchoring on a cylindrical bluff-body are investigated using DNS and experiments. Two configurations are examined: water-cooled and uncooled steel cylinders. Comparisons between experimental measurements and DNS show good agreement for the flame root locations in the two configurations. In the cooled case, the flame holder is maintained at about 300 K and the flame is stabilized in the wake of the cylinder, in the recirculation zone formed by the products of combustion. In the uncooled case, the bluff-body reaches a steady temperature of about 700 K in both experiment and DNS and the flame is stabilized closer to it. The fully coupled DNS of the flame and the temperature field in the bluff-body also shows that capturing the correct radiative heat transfer from the bluff-body is a key ingredient to reproduce experimental results.

show abstract

“…Groff [4] first measured spherical flame speeds at high pressures, up to 5 atm, by directly imaging the propagating flame front and also through pressure measurements. Lately, Taylor and coworkers [5][6][7] and Faeth and coworkers [8][9][10][11][12][13] determined val-0 s u ues for various fuel compositions and pressures through systematic subtraction of stretch effects using similar imaging techniques. The values so de-0 s u termined, with different stretch-compensated relations, are in reasonably good agreement with each other, as well as with computational calculations and the data from counterflow experiments.…”

Section: Introductionmentioning

confidence: 99%

Morphology and burning rates of expanding spherical flames in H2/O2/inert mixtures up to 60 atmospheres

Tse

Zhu

Law

2000

Proceedings of the Combustion Institute

323

143

View full text Add to dashboard Cite

Recognizing that previous experimental studies on constant-pressure, outwardly propagating, spherical flames with imaging capability were limited to pressures less than about 5 atm, and that pressures within internal combustion engines are substantially higher, a novel experimental apparatus was designed to extend the environmental pressure to 60 atm. Results substantiate previous observations of the propensity of cell formation over the flame surface due to hydrodynamic and diffusive-thermal instabilities and provide convincing evidence that wrinkled flame is the preferred mode of propagation in hydrogen/air mixtures in environments with pressures above only a few atmospheres. It is further shown that, by using helium as the diluent, and by reducing the oxygen concentration of the combustible, diffusional-thermal instability can be mostly suppressed and the hydrodynamic instability delayed. Stretch-free laminar flame speeds were subsequently determined for such smooth flames up to 20 atm and were compared with the calculated values, allowing for detailed chemistry and transport.

show abstract

Measured and predicted properties of laminar premixed methane/air flames at various pressures

Cited by 232 publications

References 14 publications

Burning Behaviour of High-Pressure CH4-H2-Air Mixtures

Burning Behaviour of High-Pressure CH4-H2-Air Mixtures

Joint experimental and numerical study of the influence of flame holder temperature on the stabilization of a laminar methane flame on a cylinder

Morphology and burning rates of expanding spherical flames in H2/O2/inert mixtures up to 60 atmospheres

Contact Info

Product

Resources

About