Experimental and analytical investigation of the turbulent burning velocity of two-component fuel mixtures of hydrogen, methane and propane

Muppala, Siva Pr; Nakahara, Masaru; Aluri, N. K.; Kido, Hiroyuki; Wen, Jennifer X.; Papalexandris, Miltiadis

doi:10.1016/j.ijhydene.2009.09.036

Cited by 81 publications

(22 citation statements)

References 13 publications

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“…[4,5] as recent examples. The same phenomenon is also documented for lean turbulent flames of various H 2 /CO/CH 4 /O 2 /N 2 mixtures [6][7][8][9][10][11], but the magnitude of the effect is decreased when the mole fraction of hydrogen in the fuel blend is decreased by retaining the same equivalence ratio.…”

Section: Introductionsupporting

confidence: 67%

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Transport equations for reaction rate in laminar and turbulent premixed flames characterized by non-unity Lewis number

Lipatnikov

Chakraborty

Sabelnikov

2018

International Journal of Hydrogen Energy

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Transport equations for (i) the rate of product creation and (ii) its Favre-averaged value are derived from the first principles by assuming that depends solely on the temperature and mass fraction of a deficient reactant in a premixed turbulent flame characterized by the Lewis number different from unity. The right hand side of the transport equation for involves seven unclosed terms, with some of them having opposite signs and approximately equal large magnitudes when compared to the left-hand-side terms. Accordingly, separately closing each term does not seem to be a promising approach, but a joint closure relation for the sum of the seven terms is sought. For this purpose, theoretical and numerical investigations of variously stretched laminar premixed flames characterized by are performed and the linear relation between integrated along the normal to a laminar flame and a product of (i) the consumption velocity and (ii) the stretch rate evaluated in the flame reaction zone is obtained. Based on this finding and simple physical reasoning, a joint closure relation of is hypothesized, where is the density and is the stretch rate. The joint closure relation is tested against 3D DNS data obtained from three statistically 1D, planar, adiabatic, premixed turbulent flames in the case of a single-step chemistry and , 0.6, or 0.8. In all three cases, agreement between and extracted from the DNS is good with exception of large () values of the mean combustion progress variable in the case of. The developed linear relation between and helps to understand why the leading edge of a premixed turbulent flame brush can control its speed.

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Section: Introductionsupporting

confidence: 67%

“…Consequently, and Eqs. (7) and (8) reduce to transport equations derived and studied earlier [20][21][22]. In this case, terms and dominate in Eq.…”

Section: Derivationmentioning

confidence: 95%

Transport equations for reaction rate in laminar and turbulent premixed flames characterized by non-unity Lewis number

Lipatnikov

Chakraborty

Sabelnikov

2018

International Journal of Hydrogen Energy

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“…The effect of this update on the laminar flame speed is also examined for the first time. Besides, we validate the three different models for calculating an effective Lewis number proposed by Law et al, 22 Muppala et al, 23 and Dinkelacker et al, 24 respectively. Finally, the effects of hydrogen addition on the laminar flame characteristics of premixed DME/air flame are systematically analyzed.…”

Section: Introductionmentioning

confidence: 63%

“…For single-component fuel at off-stoichiometric conditions, the Lewis number, Le, is defined as the ratio of thermal diffusivity (α) to mass diffusivity of deficient species to the diluent. The effective Lewis number, Le eff , can be calculated through three formulas proposed by Law et al, 22 Muppala et al, 23 and Dinkelacker et al, 24 named as heat release weighted, volume fraction weighted, and mass diffusivity weighted, respectively. More details can be found in Table 2.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Effects of Hydrogen Addition on the Laminar Flame Speed and Markstein Length of Premixed Dimethyl Ether–Air Flames

Cheng

et al. 2015

Energy Fuels

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Laminar flame speeds of premixed dimethyl ether/hydrogen/air flames were measured in a constant volume bomb at different temperatures, equivalence ratios, and hydrogen blending ratios. Results reveal that laminar flame speeds increase with an increased hydrogen blending ratio and initial temperature. The Wang model and Zhao model both perform well in predicting laminar flame speeds of the blends. Furthermore, three different models for an effective Lewis number are validated, and the volume-fraction-weighted model performs well in predicting the Markstein length. The effects of hydrogen addition on the flame speed and Markstein length of fuel blends are systematically studied. The chemical kinetic effect induced by hydrogen addition plays a dominant role in increasing the laminar flame speed in comparison to thermal and diffusive effects. In addition, there exists a critical equivalence ratio in the trend of the Markstein length. At the equivalence ratio less than the critical equivalence ratio, the Markstein length decreases with increased hydrogen fraction, indicating that the addition of hydrogen enhances the diffusional thermal instability of the blends. While at the equivalence ratio larger than the critical equivalence ratio, the Markstein length increases with the increase of the hydrogen mole fraction. Finally, the combined parameter [Ze(Le −1)] can reflect the trend of L b , which varies with the hydrogen blending ratio.

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“…Hydrodynamic instability, which is caused by the expansion across the flame sheet [12,13], is present in all flames [14][15][16]. Diffusive-thermal instability, which is caused by the preferential diffusion of mass and heat [17,18], is only present in the flames with Lewis number (Le) < 1 [19][20][21][22]. Body-force instability, which is caused by the effect of buoyancy [23], is only apparent when the laminar propagation speed of the flame is low [24].…”

Section: Introductionmentioning

confidence: 99%

Research on Cellular Instabilities of Lean Premixed Syngas Flames under Various Hydrogen Fractions Using a Constant Volume Vessel

Sun

et al. 2014

Energies

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An experimental study of the intrinsic instabilities of H 2 /CO lean (φ = 0.4 to φ = 1.0) premixed flames at different hydrogen fractions ranging from 0% to 100% at elevated pressure and room temperature was performed in a constant volume vessel using a Schlieren system. The unstretched laminar burning velocities were compared with data from the previous literature and simulated results. The results indicate that excellent agreements are obtained. The cellular instabilities of syngas-air flames were discussed and critical flame radii were measured. When hydrogen fractions are above 50%, the flame tends to be more stable as the equivalence ratio increases; however, the instability increases for flames of lower hydrogen fractions. For the premixed syngas flame with hydrogen fractions greater than 50%, the decline in cellular instabilities induced by the increase in equivalence ratio can be attributed to a reduction of diffusive-thermal instabilities rather than increased hydrodynamic instabilities. For premixed syngas flames with hydrogen fractions lower than 50%, as the equivalence ratio increases, the cellular instabilities become more evident because the enhanced hydrodynamic instabilities become the dominant effect. For premixed syngas flames, the enhancement of cellular instabilities induced by the increase in hydrogen fraction is the result of both increasing diffusive-thermal and hydrodynamic instabilities.

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Experimental and analytical investigation of the turbulent burning velocity of two-component fuel mixtures of hydrogen, methane and propane

Cited by 81 publications

References 13 publications

Transport equations for reaction rate in laminar and turbulent premixed flames characterized by non-unity Lewis number

Transport equations for reaction rate in laminar and turbulent premixed flames characterized by non-unity Lewis number

Effects of Hydrogen Addition on the Laminar Flame Speed and Markstein Length of Premixed Dimethyl Ether–Air Flames

Research on Cellular Instabilities of Lean Premixed Syngas Flames under Various Hydrogen Fractions Using a Constant Volume Vessel

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