Laminar burning velocities and combustion characteristics of propane–hydrogen–air premixed flames

Tang, Chenglong; Huang, Zuohua; Jin, Chun; He, Jiajia; Wang, Jinhua; Wang, Xibin; Miao, Haiyan

doi:10.1016/j.ijhydene.2008.06.063

Cited by 168 publications

(55 citation statements)

References 39 publications

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“…For given equivalence ratio, Re cr is decreased with the increase of initial pressure, and this indicates that the instability of flame front is increased with the increase of initial pressure. The results in this paper are in good agreement with those of Law et al [7][8][9] and Tang et al [16,20]. Figure 11 gives the Peclet number versus equivalence ratio.…”

Section: Flame Instability Analysissupporting

confidence: 90%

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Flame instability analysis of diethyl ether-air premixed mixtures at elevated pressures

Zhang

Huang

et al. 2010

Chin. Sci. Bull.

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Combustion characteristics of premixed diethyl ether-air mixtures were studied at different equivalence ratios and elevated initial pressures using schlieren photography and spherically propagating flame. Laminar burning velocities, Markstein number and critical radii at onset of cellular structure were obtained. The results show that an increase in initial pressure leads to a decrease in the unstretched laminar burning velocities. Laminar burning velocities give their peak values at the equivalence ratio of 1.1. Markstein number decrease with the increase of initial pressure and equivalence ratio, indicating that the instability of flame front is increased with the increase of initial pressure and equivalence ratio. The critical radii at onset of cellular flame structure are decreased with the increase of initial pressure. diethyl ether, laminar burning velocity, Markstein number, critical radius, flame stability Citation: Zhang N, Di Y G, Huang Z H, et al. Flame instability analysis of diethyl ether-air premixed mixtures at elevated pressures.

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Section: Flame Instability Analysissupporting

confidence: 90%

“…There are three methods to measure the laminar burning velocity, namely the stagnation plane flame method [11,12], the heat flux method [13] and the combustion bomb method [14][15][16]. The combustion bomb method uses an outwardly propagating spherical flame and calculates laminar burning velocity by analyzing flame radius.…”

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confidence: 99%

Flame instability analysis of diethyl ether-air premixed mixtures at elevated pressures

Zhang

Huang

et al. 2010

Chin. Sci. Bull.

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“…Table 4 are tabulated for Models I, II, and III in Tables S1 and S2 of the supplementary material. Figure 3 depicts literature data [14][15][16][17][18][19][20]61] and computed S o u 's of H 2 /air mixtures at p = 1 atm and unburned mixture temperature, T u = 298 K. The calculations were performed using Models I, II, and III. Between 0.5 6 / 6 1.2 ( Fig.…”

Section: Numerical Approachmentioning

confidence: 99%

“…Laminar flame speed, S o u , data with accurately quantified uncertainties are also essential in constraining kinetic models. There is a large body of literature S o u results for H 2 /air flames at atmospheric pressure (e.g., [14][15][16][17][18][19][20]). The difficulty with utilizing this data is the large spread in these measurements and the little consensus between S o u values at a fixed equivalence ratio, /.…”

Section: Introductionmentioning

confidence: 99%

Studies of premixed and non-premixed hydrogen flames

Park

Veloo

Burbano

et al. 2015

Combustion and Flame

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a b s t r a c tThe hydrogen oxidation chemistry constitutes the foundation of the kinetics of all carbon-and hydrogencontaining fuels. The validation of rate constants of hydrogen-related reactions can be complicated by uncertainties associated with experimental data caused by the high reactivity and diffusivity of hydrogen. In the present investigation accurate experimental data on flame propagation and extinction were determined for premixed and non-premixed hydrogen flames at pressures between p = 1 and 7 atm. The experiments were designed to sensitize the three-body H + O 2 + M ? HO 2 + M reaction, whose rate is subject to notable uncertainty. This was achieved by increasing the pressure and by adding to the reactants H 2 O and CO 2 whose collision efficiencies are high compared to other species. In the present study, directly measured flame properties were compared against computed ones, in order to eliminate uncertainties associated with extrapolations, as is the case for laminar flame speeds. The measured extinction strain rates exhibit both a positive and negative dependence on pressure with and without weighting with the density, and this non-monotonic behavior is caused by the competition between the H + O 2 ? O + OH and H + O 2 + M ? HO 2 + M reactions as well as HO 2 kinetic pathways as pressure increases. The various kinetic models considered in this investigation did not reproduce equally well the non-premixed flame extinction data with added H 2 O. On the other hand, the predicted extinction strain rates were consistent between the various models in the case of added CO 2 . Finally, it was shown that the formulation of binary diffusion coefficient pairs including H-N 2 and H 2 -N 2 has a first order effect on the prediction of extinction strain rates of non-premixed H 2 flames.

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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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Laminar burning velocities and combustion characteristics of propane–hydrogen–air premixed flames

Cited by 168 publications

References 39 publications

Flame instability analysis of diethyl ether-air premixed mixtures at elevated pressures

Flame instability analysis of diethyl ether-air premixed mixtures at elevated pressures

Studies of premixed and non-premixed hydrogen flames

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

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