Correlations of high-pressure lean methane and syngas turbulent burning velocities: Effects of turbulent Reynolds, Damköhler, and Karlovitz numbers

Shy, S.S.; Liu, C.C.; Lin, Jing Yi; Chen, L.L.; Lipatnikov, Andrei; Yang, S.I.

doi:10.1016/j.proci.2014.07.026

Cited by 52 publications

(25 citation statements)

References 26 publications

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“…Each 2D flame image is processed in order to evaluate an area AðtÞ enveloped by the flame and its radius R f ðtÞ ¼ ffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi AðtÞ=p p . In our previous experiments, flame kernel expansion was recorded using both direct flame imaging [68,69] and Schlieren [70] techniques, with the two methods yielding very close results [70]. In the present paper, we will restrict ourselves to R f ðtÞ-data obtained using the latter (direct flame imaging) method, because it allowed us to measure larger flame radii.…”

Section: Measurementsmentioning

confidence: 95%

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Experimental assessment of various methods of determination of laminar flame speed in experiments with expanding spherical flames with positive Markstein lengths

Lipatnikov

Shy

2015

Combustion and Flame

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Section: Measurementsmentioning

confidence: 95%

“…Because the facility and diagnostic techniques are discussed in detail elsewhere [68][69][70], we will restrict ourselves to a short description.…”

Section: Measurementsmentioning

confidence: 99%

Experimental assessment of various methods of determination of laminar flame speed in experiments with expanding spherical flames with positive Markstein lengths

Lipatnikov

Shy

2015

Combustion and Flame

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“…The fitted values of the scaling exponent q s for S T or U T vs. S L range from 0.37 [8] to 0.74 [10]. The scatter is much more pronounced for the scaling exponent q r for S T or U T vs. a ratio of L/δ L , with both negative, e.g., q r = −0.37 [8], and positive, e.g., q r = 0.25 [14], q r = 0.5 [13], or even q r = 1.35 [10], being reported.…”

Section: Introductionmentioning

confidence: 97%

“…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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Effect of Turbulence and Diffusional–Thermal Instability on Hydrogen‐Rich Syngas Turbulent Premixed Flame

Zhang,

Li,

et al. 2023

Energy Tech

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As a kind of fuel with low‐carbon emissions, hydrogen‐rich syngas has a large resource potential and is a promising alternative energy resource. A series of experiments in a constant volume combustion bomb are carried out to investigate the effects of turbulence and diffusional–thermal (DT) instability on a hydrogen‐rich syngas turbulent premixed flame. The flow field in the constant volume combustion bomb is calibrated, and the turbulent flow field's homogeneity and isotropy were investigated. The effects of different speeds of fan (1366–4273 rpm), hydrogen fractions (55%–95%), pressures (1.0–3.0 bar), and equivalence ratios (0.6–1.0) on the hydrogen‐rich syngas turbulent premixed flame are studied. According to the analyses, the flow field in the experimental device exhibits good homogeneous and isotropic characteristics. With the increase of turbulence intensity, equivalence ratio, hydrogen fraction, or pressure, the turbulent flame propagation speed increases gradually. As the hydrogen fraction increases or the equivalence ratio decreases, the effective Lewis number decreases, and the effect of DT instability on the flame increases. The research in this article is crucial for the clean and efficient utilization of hydrogen‐rich syngas and the design of related burners.

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Correlations of high-pressure lean methane and syngas turbulent burning velocities: Effects of turbulent Reynolds, Damköhler, and Karlovitz numbers

Cited by 52 publications

References 26 publications

Experimental assessment of various methods of determination of laminar flame speed in experiments with expanding spherical flames with positive Markstein lengths

Experimental assessment of various methods of determination of laminar flame speed in experiments with expanding spherical flames with positive Markstein lengths

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

Effect of Turbulence and Diffusional–Thermal Instability on Hydrogen‐Rich Syngas Turbulent Premixed Flame

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