Experimental observations on the influence of hydrogen atoms diffusion on laminar and turbulent premixed burning velocities

Burluka, Alexey; Gaughan, R. G.; Griffiths, J. F.; Mandilas, C.; Sheppard, C. G. W.; Woolley, Robert

doi:10.1016/j.fuel.2016.10.088

Cited by 10 publications

(6 citation statements)

References 43 publications

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“…The third method applied to process the same DNS data on U T (θ ) is associated with an experiment with an expanding statistically spherical premixed turbulent flame. In such experiments, e.g., [4,9,13,14,18,20], measurements are performed in a bounded range of the flame kernel radii R f , with this range being independent on mixture composition, turbulence characteristics, pressure, and temperature. To mimic such measurements, we numerically integrated the following equation…”

Section: Resultsmentioning

confidence: 99%

“…Second, while experimental data obtained from expanding premixed turbulent flames convey some information on the transient effects, e.g., see Refs. [3,9,13,14,18,20,49,50], development of U T or S T has yet been addressed in a few experimental investigations of statistically stationary premixed turbulent flames [17,63]. Definitely, the issue requires further target-directed research.…”

Section: Resultsmentioning

confidence: 99%

“…Accordingly, as reviewed elsewhere [1][2][3], S T and U T were in the focus of experimental research into premixed combustion for many years. In particular, over the past decade, such measurements were conducted by various research groups, e.g., [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. However, values of U T and S T obtained from different experiments under similar conditions, i.e., comparable rms turbulent velocities u , close unburned gas temperatures, the same pressure, the same fuel, and the same equivalence ratio, are strongly scattered, e.g., see Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Then, strictly speaking, research into turbulent burning velocity and flame speed is of minor fundamental value. On the other hand, while the scatter of measured U T , S T , and their scaling exponents seems to be a sufficient reason for expressing concern over the notions of these quantities, such a standpoint is not widely accepted and evaluation of U T and S T is still in the focus of experimental research into premixed combustion, e.g., see [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and references quoted therein. Moreover, U T and S T are widely used in numerical simulations of turbulent flames, as reviewed elsewhere [3,[22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

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A DNS Study of Sensitivity of Scaling Exponents for Premixed Turbulent Consumption Velocity to Transient Effects

Lipatnikov

2018

Flow Turbulence Combust

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3D Direct Numerical Simulations of propagation of a single-reaction wave in forced, statistically stationary, homogeneous, isotropic, and constant-density turbulence, which is not affected by the wave, are performed in order to investigate the influence of the wave development on scaling (power) exponents for the turbulent consumption velocity U T as a function of the rms turbulent velocity u , laminar wave speed S L , and a ratio L 11 /δ F of the longitudinal turbulence length scale L 11 to the laminar wave thickness δ F. Fifteen cases characterized by u /S L = 0.5, 1.0, 2.0, 5.0, or 10.0 and L 11 /δ F = 2.1, 3.7, or 6.7 are studied. Obtained results show that, while U T is well and unambiguously defined in the considered simplest case of a statistically 1D planar turbulent reaction wave, the wave development can significantly change the scaling exponents. Moreover, the scaling exponents depend on a method used to compare values of U T , i.e., the scaling exponents found by processing the DNS data obtained at the same normalized wave-development time may be substantially different from the scaling exponents found by processing the DNS data obtained at the same normalized wave size. These results imply that the scaling exponents obtained from premixed turbulent flames of different configurations may be different not only due to the well-known effects of the mean-flame-brush curvature and the mean flow non-uniformities, but also due to the flame development, even if the different flames are at the same stage of their development. The emphasized transient effects can, at least in part, explain significant scatter of the scaling exponents obtained by various research groups in different experiments, thus, implying that the scatter in itself is not sufficient to reject the notion of turbulent burning velocity. Keywords Premixed turbulent combustion • Burning velocity • Consumption velocity • Turbulent flame development • DNS Nomenclature a heat diffusivity of a mixture c combustion progress variable

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A DNS Study of Sensitivity of Scaling Exponents for Premixed Turbulent Consumption Velocity to Transient Effects

Lipatnikov

2018

Flow Turbulence Combust

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“…Researchers [13][14][15] have experimentally studied the laminar burning velocity of hydrogen in the constant combustion bomb under different conditions. Furthermore, most previous studies on hydrogen/air premixed flame have focused on the intrinsic instability of premixed combustion [16,17].…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Flame Instability on the Flame Structural Characteristics of Hydrogen/Air Mixtures Based on the Fast Fourier Transform

Jiang

et al. 2017

Energies

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Abstract:In this study, the effect of flame intrinsic instability on the flame structural characteristics of hydrogen/air mixtures premixed at various equivalence ratios were experimentally investigated from the macroscopic and microscopic perspectives, respectively. The correlation degree and the relative deformation degree were defined to quantitatively study the global flame structural characteristics. Peak detection was used to capture the characteristic length of the flame and fast Fourier transform was adopted to study the components of the fluctuation of the flame front. The results show that with the development of flames, the wrinkles in the flame front increase and the correlation degree of the flame decreases. The relative deformation degree of the flame first decreases and then increases. When the equivalence ratio is 0.6, the average characteristic length initially exhibits an increasing trend, followed by a decreasing trend. The average characteristic length scale gradually increases, and the growth rate gradually decreases when the equivalence ratio ranges from 0.70 to 0.99. With the increase in the wavenumber, the amplitude of the corresponding disturbance exhibited an increasing trend followed by a decreasing one. With the development of the flame, the maximum amplitude of the disturbance shows a reverse trend, i.e., first decreasing and then increasing. The disturbances with smaller wavelengths could be further developed.

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Experimental investigations of laminar and turbulent burning velocities of thermally cracked hydrocarbon fuels

Zhang

Liu

Hou

2022

Combustion and Flame

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Experimental observations on the influence of hydrogen atoms diffusion on laminar and turbulent premixed burning velocities

Cited by 10 publications

References 43 publications

A DNS Study of Sensitivity of Scaling Exponents for Premixed Turbulent Consumption Velocity to Transient Effects

A DNS Study of Sensitivity of Scaling Exponents for Premixed Turbulent Consumption Velocity to Transient Effects

Study on the Effect of Flame Instability on the Flame Structural Characteristics of Hydrogen/Air Mixtures Based on the Fast Fourier Transform

Experimental investigations of laminar and turbulent burning velocities of thermally cracked hydrocarbon fuels

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