Burning velocity correlation of methane/air turbulent premixed flames at high pressure and high temperature

Kobayashi, Haruo; Seyama, Katsuhiro; Hagiwara, Hirokazu; Ogami, Yasuhiro

doi:10.1016/j.proci.2004.08.098

Cited by 158 publications

(106 citation statements)

References 11 publications

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“…Hence, the flame-front production at the scales comparable to the critical wavelength is dominated by intrinsic instability, which therefore controls the smallscale dynamics of flames. This behavior has been experimentally found by Kobayashi et al [20][21][22] In other regions, intrinsic instability has only a minor influence, and the effects of turbulence are dominant.…”

Section: Discussion and Regime Diagramsupporting

confidence: 78%

“…It was reported that the characteristics of turbulent premixed flames are significantly affected by intrinsic instability under high-pressure and high-temperature conditions. [20][21][22] Numerical simulations can investigate these interactions of turbulent combustion and intrinsic instability. The results from these simulations can further be used to construct models for Reynolds averaged combustion models and large-eddy simulations.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussion and Regime Diagramsupporting

confidence: 78%

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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“…In Figure 5, in;3D is plotted against D=δ F , where D is the most expected diameter of coherent fine scale eddies (D ¼ 8:0η) (Tanahashi et al, 2001;Wang et al, 2007). Inner cutoffs and models reported in previous studies (Goix and Shepherd, 1993;Gorgen and Gökalp, 1993;Gülder and Smallwood, 1995;Gülder et al, 2000;Kobayashi et al, 2005;Peters, 1986;Poinsot et al, 1990;Roberts et al, 1993;Shim et al, 2011;Smallwood et al, 1995) are also shown in Figure 5. The 3D inner cutoffs in;3D obtained in the present DNS have a comparable trend with previous experimental and numerical results shown in the figure.…”

Section: Fractal Characteristicsmentioning

confidence: 76%

A Fractal Dynamic SGS Combustion Model for Large Eddy Simulation of Turbulent Premixed Flames

Hiraoka

Minamoto

Shimura

et al. 2016

Combustion Science and Technology

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Direct numerical simulation of a turbulent hydrogen-air premixed plane jet flame is performed to investigate fractal characteristics and to evaluate the fractal dynamic subgrid scale (FDSGS) combustion model. The DNS results show that the fractal dimension of flame surfaces increases with the downstream distance, and the fractal dimension computed using a 3D box-counting method reaches about 2.54 in the region where turbulence is developed by mean shear. An inner cutoff representation employed in the FDSGS combustion model could be used in large eddy simulations (LES) of complicated combustion problems. Static tests show that the procedure applied in the FDSGS combustion model adequately predicts the fractal dimension, Kolmogorov length scale, and flame surface area despite the presence of strong mean shear. Dynamic model evaluations are also carried out by conducting a series of LES using the FDSGS and other combustion models. In the dynamic tests, the mean temperature distributions and peak positions of variations of a reaction progress variable fluctuation in the transverse direction obtained from the LES with the FDSGS combustion model show good agreement with the filtered DNS fields. The present evaluation also revealed that one of the strengths in the FDSGS combustion modeling approach is that the model does not require SGS turbulent velocity fluctuation, since modeling of this quantity is straightforward for neither homogeneous turbulence nor the turbulent shear flows. ARTICLE HISTORY

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“…In addition, we can investigate experimentally and numerically the characteristics of laminar and turbulent premixed flames with preheating and can compare with the results on premixed flames without preheating. (26) These investigations belong to the most significant field of study in premixed combustion.…”

Section: Discussionmentioning

confidence: 99%

Asymptotic Analysis on High-temperature Premixed Flames: Instability of Flame Fronts under the Constant-enthalpy Conditions

Kadowaki

2010

JTST

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Asymptotic analysis on premixed flames with high-temperature combustible mixtures was performed to elucidate the instability of flame fronts. Planar premixed flames with sufficiently low Mach numbers were treated, and a one-step irreversible chemical reaction with sufficiently high activation energy was assumed. Through the asymptotic analysis, we obtained the formula for the burning velocity, depending on the temperature of burned and unburned gases and on the mass fraction of fuel. To investigate the instability of high-temperature premixed flames under the constant-enthalpy conditions, we obtained the instability intensity which depended on the burning velocity and on the temperature ratio of burned and unburned gases, where the burned-gas temperature was constant. As the unburned-gas temperature became higher, the instability intensity became higher, except for premixed flames with low reaction exponents under the conditions of constant-density unburned gases. This was because that the instability intensity was determined by the competition between the increase of the burning velocity and the decrease of the temperature ratio.

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Burning velocity correlation of methane/air turbulent premixed flames at high pressure and high temperature

Cited by 158 publications

References 11 publications

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

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

A Fractal Dynamic SGS Combustion Model for Large Eddy Simulation of Turbulent Premixed Flames

Asymptotic Analysis on High-temperature Premixed Flames: Instability of Flame Fronts under the Constant-enthalpy Conditions

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