Direct and indirect measurements of Markstein numbers of premixed flames

Searby, Geoffrey; Quinard, Joel

doi:10.1016/0010-2180(90)90004-b

Cited by 124 publications

(85 citation statements)

References 7 publications

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“…Asymptotic analysis showed that the Markstein number is a function of thermodynamic and transport properties of the mixture [2][3][4], such that it can assume positive or negative values depending on the diffusivity of the deficient reactant species, known as the Lewis number effect. Experimental measurements have been performed to confirm this prediction [5][6][7][8], while computational studies with detailed chemical kinetics and transport provided means to extract accurate values of the Markstein numbers for various fuel mixtures [9,10].…”

Section: Introductionmentioning

confidence: 99%

Effects of flow transients on the burning velocity of laminar hydrogen/air premixed flames

Chen

2000

Proceedings of the Combustion Institute

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Section: Introductionmentioning

confidence: 99%

Effects of flow transients on the burning velocity of laminar hydrogen/air premixed flames

Chen

2000

Proceedings of the Combustion Institute

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“…On the other hand, following an early proposal of Markstein (13) , the theories and measurements have been suggested a linear relationship between the laminar burning velocity and flame stretch (14) - (17) . Faeth et al (18), (19) have proposed the following relationship for outwardly propagating spherical laminar flames.…”

Section: Local Flame Displacement Velocitymentioning

confidence: 98%

A Study on the Local Flame Displacement Velocity of Premixed Turbulent Flames

Nakahara

Kido

Nakashima

2005

JSME international journal. Ser. B, Fluids and thermal engineer

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The local flame properties of turbulent propagating flames with respect to the ratio of the turbulence intensity to the laminar burning velocity u /S L0 in the flamelet regime have been investigated experimentally for methane, propane and hydrogen mixtures having nearly the same laminar burning velocity with different equivalence ratios. u /S L0 is varied as 1.4 and 2.3. A 2D laser tomography technique is used to obtain the flame configuration and movement in a constant-volume vessel and then the local flame displacement velocity S F is quantitatively measured as a key parameter of turbulent combustion. As a result, the mean value of S F shows to be affected by u /S L0 , which indicates a relation between the characteristic chemical reaction time and the characteristic flow time, to some extent, especially for leaner and richer mixtures. S F is also discussed by the concept of preferential diffusion and Markstein number which can affect the local burning velocity characteristics.

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“…Instability phenomena of premixed flames are observed in experiments as the formation and unstable behavior of cellular flames. [1][2][3][4][5][6] The intrinsic instability of premixed flames consists of hydrodynamic instability, caused by the thermal expansion through the flame front, and of diffusive-thermal instability, caused by the preferential diffusion of mass versus heat. [7][8][9][10][11] Through numerical simulations, it was found that the shape and motion of premixed flames are strongly affected by intrinsic instability.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Behavior of Premixed Flames Propagating in Non-Uniform Velocity Fields —Assessment of Intrinsic Instability in Turbulent Combustion—

Kadowaki

Kobayashi

2009

Trans. Japan Soc. Aero. S Sci.

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The dynamic behavior of premixed flames propagating in non-uniform velocity fields was investigated to assess the significance of intrinsic instability in turbulent combustion. Two-dimensional unsteady calculations of reactive flows based on the compressible Navier-Stokes equations including a one-step irreversible chemical reaction were performed. A sinusoidal disturbance was superimposed on the velocity field of the unburned gas, and its wavelength was set equal to the linearly most unstable wavelength, i.e. the critical wavelength, at the Lewis number Le ¼ 1:0. To investigate the effects of intrinsic instability on the dynamic behavior of premixed flames, we treated two basic types of intrinsic instability, i.e. hydrodynamic instability and diffusive-thermal instability. The dynamic behavior of cellular flames generated both by intrinsic instability and by velocity disturbances was numerically simulated. When Le ¼ 1:0, at the initial evolution, we observed a cellular flame whose cell size was equal to the wavelength of velocity disturbances. After that, cells combined together, and one large cell appeared. When Le ¼ 0:5, on the other hand, several cells smaller than the wavelength of velocity disturbances were found, and the combination and division of cells were observed. This is because that the size of cells caused only by intrinsic instability is smaller than the wavelength of velocity disturbances. Thus, the dynamic behavior of premixed flames is drastically affected not only by velocity disturbances but also by intrinsic instability. The burning velocity of cellular flames propagating in non-uniform velocity fields was larger than that of planar flames, since cellular flames had larger surface area. The burning velocity became larger as the intensity of velocity disturbances became higher, and the dependence of the burning velocity on the intensity was strongly affected by the Lewis number. The relative significance of intrinsic instability on the evolution of turbulent premixed flames was identified by comparing the growth rate and production rate of flame fronts due to intrinsic instability and turbulence. In the region where the growth rate due to intrinsic instability was larger than that due to turbulence, the dynamic behavior was strongly affected by intrinsic instability. This region includes the combustion conditions of many industrial combustors, and then intrinsic instability plays a significant role in the characteristics of turbulent combustion.

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Direct and indirect measurements of Markstein numbers of premixed flames

Cited by 124 publications

References 7 publications

Effects of flow transients on the burning velocity of laminar hydrogen/air premixed flames

Effects of flow transients on the burning velocity of laminar hydrogen/air premixed flames

A Study on the Local Flame Displacement Velocity of Premixed Turbulent Flames

Dynamic Behavior of Premixed Flames Propagating in Non-Uniform Velocity Fields —Assessment of Intrinsic Instability in Turbulent Combustion—

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