Nonlinear effects of stretch on the flame front propagation

Halter, Fabien; Tahtouh, Toni; Mounaïm‐Rousselle, Christine

doi:10.1016/j.combustflame.2010.05.013

Cited by 206 publications

(105 citation statements)

References 27 publications

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“…There is literature abundant available on unstretched laminar burning velocity of methane for validation of the setup [24][25][26][27]. The present experimental and numerical results of adiabatic burning velocities of methane-air are plotted in Fig.…”

Section: Validation Of Experimental Setupmentioning

confidence: 87%

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

Zahedi

Yousefi

2014

J Mech Sci Technol

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To cite this version:Peyman Zahedi, Kianoosh Yousefi. Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures. AbstractIn this research we have studied the effects of increasing pressure and adding carbon dioxide, hydrogen and nitrogen to Methane-air mixture on premixed laminar burning velocity and NO formation in experimentally and numerically methods. Equivalence ratio was considered within 0.7 to 1.3 for initial pressure between 0.1 to 0.5 MPa and initial temperature was separately considered 298 K. Mole fractions of carbon dioxide, hydrogen and nitrogen were regarded in mixture from 0 to 0.2. Heat flux method was used for measurement of burning velocities of Methane-air mixtures diluted with CO2 and N2. Experimental results were compared to the calculations using a detailed chemical kinetic scheme (GRI-MECH 3.0). At first, the results in atmosphere pressure for Methane-air mixture were calculated and it was compared with the results of literature. Results were in good agreement with published data in the literature. Afterwards, by adding carbon dioxide and nitrogen to Methane-air mixture, we witnessed that laminar burning velocity was decreased, whereas by increasing hydrogen, the laminar burning velocity was increased. Finally, the results showed that by increasing the pressure, the premixed laminar burning velocity decreased for all mixtures and NO formation indicates considerable increase, whereas the laminar flame thickness decreases.

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Section: Validation Of Experimental Setupmentioning

confidence: 87%

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

Zahedi

Yousefi

2014

J Mech Sci Technol

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“…Since −0.2 ≤ L b ≤ 0.2 mm, and the minimum flame radius used in the image processing is ~4.5 mm, the ratio |L b /r u min | results lower than ~0.045. According to Halter et al [24], this legitimate the use of the linear approach, as the relative error respect to the nonlinear approach is negligible.…”

Section: Laminar Burning Propertiesmentioning

confidence: 99%

“…It depends on the mathematical model and the associated hypotheses. A detailed analysis leads to the nonlinear formulation [23,24]:…”

Section: Theorymentioning

confidence: 99%

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

Moccia

D'Alessio

2013

Energies

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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.

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“…As will be illustrated in section 4.3 the maximum value of L b measured in the current experimental study corresponds to 0.9 mm. Following the correlation derived by Halter et al (25) for evaluating the relative percentage difference between linear and not linear extrapolation methodology, the maximum difference in the current experimental study corresponds to 2%. Therefore it was concluded that in the current study a linear extrapolation methodology can still be used with confidence.…”

Section: Flame Theorymentioning

confidence: 99%

Experimental Investigation on the Laminar Burning Velocities and Markstein Lengths of Methane and PRF95 Dual Fuels

et al. 2016

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Natural gas is a promising alternative fuel. The main constituent of natural gas is methane. The slow burning velocity of methane poses significant challenges for its utilization in future energy efficient combustion applications. The effects of methane addition to PRF95 on the fundamental combustion parameters, laminar burning velocity (S u 0 ) and Markstein length (L b ), were experimentally investigated in a cylindrical combustion vessel at equivalence ratios of 0.8, 1, and 1.2, initial pressures of 2.5, 5, and 10 bar, and a constant temperature of 373 K. Methane was added to PRF95 in three different energy ratios 25%, 50%, and 75%. Spherically expanding flames were used to derive the flow-corrected flame velocities, from which the corresponding L b and S u 0 were obtained. The flame velocities were corrected for the motion of burned gas induced by the cylindrical confinement. It has been found that at stoichiometric conditions there is a linear decrease in L b and S u 0 with the dual fuel (DF) ratio in all investigated pressures. At rich conditions, all DFs resulted in having lower S u 0 as compared to methane and to a larger extent PRF95. The values of L b for all DFs were lower than methane and comparable to those of PRF95. At lean conditions, the values of L b for all DFs are biased toward those of methane whereas the values of S u 0 are found to be higher than those of PRF95 at pressures of 2.5 and 5 bar. At 10 bar both L b and S u 0 reduce with DF ratio although S u 0 of all DFs converge to that of PRF95. The findings of the current study indicate a distinct synergy in the utilization of dual fueling in future lean burn energy efficient combustion applications.

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Nonlinear effects of stretch on the flame front propagation

Cited by 206 publications

References 27 publications

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

Effects of pressure and carbon dioxide, hydrogen and nitrogen concentration on laminar burning velocities and NO formation of methane-air mixtures

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

Experimental Investigation on the Laminar Burning Velocities and Markstein Lengths of Methane and PRF95 Dual Fuels

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